"WYEOMYIA ONIDUS 125 



WYEOMYIA ONIDUS Dyar & Knab. 

 Wyeomyia onidua Dyar & Knab, Smiths. Misc. Colls., quart. Iss., HI, 261, 1909. 

 Obioinai Description of Wteomyia onidus : 



Femaij!. — Proboscis moderately long, swollen at the tip. Occiput dark-scaled, the 

 margin of the eyes narrowly white. Prothoracic lobes dark-scaled without white 

 apices. Abdomen dark-scaled above with bronzy luster, white beneath, the colors 

 separated in a straight line. Legs bronzy brown, the femora pale at base beneath, 

 the hind tarsi with the last two joints silvery white beneath, the white interrupted 

 at the apex of the fourth joint; fore and mid tarsi without white. Wing-scales broad. 



Mat.f,, — Coloration as in the female. 



Three specimens, bred from larvae in the flower-cups of Heliconia, Tabernilla, 

 Canal Zone, Panama (A. H. Jennings). 



Type no. 12054, U. S. N. M. 



Description of Female, Male, and Labva op Wteomyia onidus : 



Female. — Proboscis rather short, swollen apically, the vestiture black with 

 a bronzy and blue reflection, a stronger bronzy luster beneath; labellae small, 

 rounded, with fine outstanding setae. Palpi short, one-seventh as long as 

 proboscis, bluish black. Antennae moderate, the joints slender, subequal, rugose, 

 coarsely pilose, black; tori subspherical, with a cup-shaped apical excavation, 

 luteous brown, with a whitish pruinosity ; hairs of whorls rather long, sparse, 

 black. Clypeus rounded, convex, dark brown, pruinose. Byes separated at 

 the vertex by a narrow wedge, bluish black. Occiput clothed with flat blackish- 

 brown scales with a metallic reflection ; margins of eyes narrowly white-scaled, 

 a white patch on lower part of side ; a diffused pale, iridescent, longitudinal line 

 on the vertex; two long setae at the vertex and shorter ones along margins of eyes. 



Prothoracic lobes elliptical, well separated, clothed with flat scales, blackish 

 brown with a slight blue reflection; a row of setje along anterior margin. 

 Mesonotum clothed with flat dark-brown scales with a bronzy and blue reflec- 

 tion; bristles over roots of wings black; some pale scales on anterior margin 

 and bluish ones under lateral angles. Scutellum trilobate, vestiture similar 

 to that of mesonotum, each lobe with a tuft of black bristles. Postnotum 

 elliptical, prominent, a trace of median carina, dark drown, a group of small 

 setae near posterior margin. Pleuree dark brown, coxae luteous, clothed with flat 

 silvery-white scales. 



Abdomen subcylindrical, truncate apically, the tip with dark bristles ; dorsal 

 vestiture black with a bronzy luster ; venter silvery white, the colors separated 

 on the sides in a straight Une. 



Wings rather narrow, hyaline; petiole of second marginal cell one-fourth 

 as long as its cell ; that of second posterior cell nearly as long as its cell ; basal 

 cross-vein distant about its own length from the anterior cross- vein; scales of 

 veins dense, broadly ovate, tips obliquely subtruncate, brown, with a blue reflec- 

 tion on costa, somewhat denser on forks of second vein. Halteres black, whitish 

 at base of stem. 



Legs rather long and slender, the vestiture black with bronzy reflection, the 

 femora pale beneath ; tibiae and tarsi with bright bronzy luster beneath ; hind 

 tarsi with last two joints silvery white beneath, the white interrupted at apex 

 of fourth joint; fore and mid tarsi without white markings. Claw formula, 

 0.0-0.0-0.0. 



Length : Body about 3 mm. ; wing 3 mm. 



Male. — Palpi shorter than in the female, one-eighth as long as proboscis. 

 Coloration as in the female. Antennae with small secondary subapical whorls 

 of hairs on the joints, basal whorls of longer and more abundant hairs than in 

 the female. Abdomen subcylindrical, slightly expanded at tip, the claspers con- 

 spicuous. Wing narrower than in the female, the venation and vestiture much 

 the same. Tibiae and tarsi with a pale-bronzy luster beneath ; the white mark- 



