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sometimes four-fifths the length of the segment on each side of the median notch, considerably or moderately narrowed towards the sides, never going over the side margins in more than half the length of the segment, sometimes only narrowly at the anterior angles. The fourth segment is variable, sometimes all black, but most frequently with a triangular spot on the anterior angles and a pair of narrowly separated triangular spots in the middle at the base reddish yellow. Sometimes all of these markings may be more or less fused with the central black stripe (vitta) usually distinct. The fifth abdominal segment is yellowish basally, more broadly so in the middle. The pile slightly shorter throughout. In the
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longer on the ocellar triangle and is yellow at the vertex. The face is yellow, with yellow pollen and a prominent rounded tubercle in the middle. The gena are shining black. The antennae are red with the flagellum obscurely brownish above. The arista is brown. The frontal prominence is yellow with side margins and the lower sides with sparse, short yellowish pile. The eyes are contiguous
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The abdomen is black with bold yellow spots. The second segment has a pair of large yellow spots, rounded interiorly and directed forward laterally so that they touch the anterior margin towards the sides. The third segment has a broad, complete basal yellow band (fascia) occupying at least half,
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The frontal triangle is opaque yellow, The vertical triangle is black, with black pile. In the female the frons is moderately narrowed above and yellow on the lower fourth, shining greenish black elsewhere except thinly reddish pollinose in front of the ocelli. The pile is black. The pile is
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The dorsum of thorax (scutum) is aeneous with pile bright yellow before the transverse suture, on the narrow lateral margins and immediately in front of the scutellum. The humeri (postpronotum) and border of the scutum are yellow. The area on the disc behind the suture is black. In the
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first officially described by
Williston in 1882. Hoverflies get their names from the ability to remain nearly motionless while in flight. The adults are also known as flower flies, for they are commonly found around and on the flowers from which they get both energy-giving
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the abdominal bands are narrower, the second and third segments are usually narrowly interrupted in the middle, fifth segment is yellowish basally, more broadly so in the middle and the pile is slightly shorter throughout. The hypopygium usually reddish.
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there is a patch of black pile before the ends of the thoracic suture and the scutellum is aeneous with long, bright yellow pile, but there are some black hairs on the disc.
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is almost straight and joins the costa just before the tip of the wing. The first posterior cell r
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The wings are cinereous hyaline, somewhat yellowish on the basal portion anteriorly. The squamae
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in the male. The occiput is greyish yellow pollinose, with bright yellow pile.
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529:""Contribution to a monograph of the American Syrphidae north of Mexico""
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is acute apically and extends almost to the wing margin before the tip.
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This article incorporates text from this source, which is in the
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This article incorporates text from this source, which is in the
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This article incorporates text from this source, which is in the
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488:"Contribution to a monograph of the North American Syrphidae"
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type, feeding on exuding sap or in the rot holes of trees.
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found on the western coastal area of North
America.
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324:The genitalia were described by Metcalf in 1921
336:are white, with a yellow border and fringe. The
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566:Annals of the Entomological Society of America
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451:Bulletin of the United States National Museum
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447:"Synopsis of the North American Syrphidae"
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843:Taxa named by Samuel Wendell Williston
533:The Kansas University Science Bulletin
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486:Williston, Samuel Wendell (1882).
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562:"The Genitalia of Male Syrphidae"
233:. The larvae of Blera are of the
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527:Curran, Charles Howard (1925).
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408:dorsal view of Syrphid thorax
220:, is an uncommon species of
776:. You can help Knowledge by
340:(#9) are yellow. The vein R
838:Hoverflies of North America
864:
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828:Insects described in 1882
768:This article relating to
445:Williston, S. W. (1887).
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41:Scientific classification
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833:Diptera of North America
492:Proc. Amer. Philos. Soc
560:Metcalf, C.L. (1921).
271:Size 10 to 13 mm.
384:profile syrphid head
262:Morphology of Diptera
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735:Open Tree of Life
586:Taxon identifiers
229:and protein-rich
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196:Criorhina scitula
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360:Blera wing veins
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247:Nearctic species
218:western wood fly
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16:Species of fly
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594:Blera scitula
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161:Binomial name
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459:. Retrieved
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423:head profile
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241:Distribution
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709:NatureServe
683:iNaturalist
457:: xxx + 335
256:Description
222:syrphid fly
118:Eristalinae
114:Subfamily:
817:Categories
572:: 169–266.
429:References
372:Insect leg
245:This is a
235:rat-tailed
78:Arthropoda
823:Milesiini
770:Milesiini
609:Q10740371
320:Genitalia
200:Williston
178:Williston
146:Species:
128:Milesiini
108:Syrphidae
64:Kingdom:
58:Eukaryota
714:2.949956
631:BugGuide
603:Wikidata
539:: 7–216.
338:halteres
334:Calypter
283:Holoptic
187:Synonyms
104:Family:
74:Phylum:
68:Animalia
54:Domain:
740:4355427
727:1690314
675:5071130
502:23 July
304:Abdomen
180:, 1882)
134:Genus:
124:Tribe:
98:Diptera
94:Order:
88:Insecta
84:Class:
701:141336
688:499872
662:750273
636:540261
623:202398
461:1 July
313:female
298:female
289:Thorax
231:pollen
227:nectar
216:, the
202:, 1882
772:is a
328:Wings
139:Blera
774:stub
722:NCBI
696:ITIS
670:GBIF
649:M6NH
618:BOLD
504:2021
463:2015
274:Head
657:EoL
644:CoL
346:4+5
342:4+5
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437:^
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176:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
