WYEOMYIA CHRYSOMUS 71 



spherical, with a cup-shaped apical excavation, dark-brown, slightly pruinose; 

 hairs of whorls rather long, moderately abundant, black. Eyes separated on 

 vertex by a narrow wedge, black. Occiput clothed with fiat, appressed scales, 

 black with blue and green reflection, a vertical white patch between the eyes, a 

 white patch at the sides below, a row of setae along margin of eyes. 



Prothoracic lobes separated dorsally, brown, clothed with coppery scales with 

 a violaceous golden reflection. Mesonotum black, clothed with flat, brown scales, 

 with obscure bronzy luster, anterior margin silvery-white scaled. Scutellum 

 trilobate, clothed ^vith scales similar to mesonotum, each lobe with a tuft of 

 brown bristles. Postnotum elliptical, prominent, blackish, a tuft of small 

 setse posteriorly. Pleurae brown, coxae luteous, clothed with elliptical, silvery- 

 white scales. 



Abdomen subcylindrical, compressed to apical third, with many coarse, black 

 terminal setae, apex somewhat enlarged; dorsal vestiture black, with a sub- 

 metallic bronzy and blue reflection; venter yellowish-silvery-white, the colors 

 separated on the sides in a straight line, the last segment dark. 



Wings rather narrow, hyaline ; petiole of second marginal cell less than half 

 as long as its cell, that of second posterior cell shorter than its cell ; basal cross- 

 vein less than its own length from anterior cross-vein; outstanding scales of 

 veins long, ligulate, black, with a bronzy-blue reflection on costa, those at apex 

 of wing denser and slightly broader. Halteres largely blackish. 



Legs rather long and slender, black with a bronzy and blue reflection, 

 trochanters silvery-white beneath, femora and tibise pale-brassy beneath, mid 

 legs with tips of second and all of third and fourth tarsal joints white beneath. 

 Claw formula, 0.0-0.0-0.0. 



Length : Body about 3 mm. ; wing 2.5 mm. 



Grenitalia (plate 3, fig. 14) : Side-pieces over twice as long as broad, tips 

 much tapered ; basal lobes rounded triangular, setose ; three long setae in a row. 

 Clasp-filament short, stout, divided into three lobes ; inner one slender, smooth ; 

 middle one broad, conically tapered, bearing rows of setae; outer one slender, 

 with several teeth towards the tip. Harpes broad, with a thickened margin, 

 the tips curved and obscurely dentate. Harpagones forming a basal cone. Unci 

 forming a similar, smaller cone. Basal appendages small, each with three setae. 



The larvae were obtained by Mr. Busck in water in the leaves of an epiphytic 

 bromeliad growing on a tree in a native village near Tabernilla, Canal Zone, 

 Panama, associated with Orthopodomyia pliyllozoa, but no larval skins were 

 preserved. 



Panama. 



Tabernilla, Canal Zone, June 25, 1907 (A. Busck). 



This species is similar to Wyeomyia luteoventralis, from Para, Brazil (Theo- 

 bald, Mou. Culicid., ii, 348, 1901), and Wyeomyia quasiluteov entrails, from 

 British Guiana (Theobald, Mon. Culicid., iii, 317, 1903), the types of which 

 Dr. Howard has examined in the British Museum. He reports : " Prothoracic 

 lobes with purplish-coppery scales; middle tarsi with the three terminal joints 

 whitish; eye margin narrowly white above, broadly so below; proboscis not 

 swollen." This report covers both species. It is possible that they are the same 

 and that TF. chrysomus is a synonym. These species, however, should have broad 

 wing-scales, as they were referred by Theobald to Dendromyia, which is char- 

 acterized by broad wing-scales. Our species has narrow wing-scales. We are 

 aware of Theobald's figure of the wing of Dendromyia luteoventralis (Mon. 

 Culicid., iii, 318, 1903) , showing narrower scales ; but we can not tell from what 

 specimen it was made, as he cites several new and widely separated localities, and 

 may have had several species confused under this name. We therefore retain 

 the name Wyeomyia chrysomus for the form before us. 



