106 MOSQUITOES OF NOKTH AMERICA 



WYEOMYIA LABESBA, new species. 



Descbiption of Female and Laeva of Wteomyia labesba (Male Unknown) : 



Female. — Proboscis moderate, tip somewhat expanded, labellffi small, 

 rounded, with fine outstanding setse; vestiture bluish black, brassy beneath 

 nearly to tip. Palpi short, flattened, one-eighth as long as proboscis, bronzy 

 black. Antennae moderate, the joints slender, subequal, rugose, coarsely pilose, 

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

 a slight pruinosity; hairs of the whorls long, rather sparse, black. Clypeus 

 rounded, broad, dark brown, pruinose. Byes separated at vertex by a narrow 

 wedge, bluish black. Occiput clothed with flat brown scales with a slight 

 bronzy reflection, a narrow white margin behind the eyes, constricted or inter- 

 rupted subdorsally, joining a large white patch on lower part of sides; a row 

 of setse along margin of eyes, two long ones at vertex. 



Prothoracic lobes elliptical, distinctly separated, clothed with flat black scales 

 with bronzy violaceous luster, tips rather broadly and the base silvery white. 

 Mesonotum clothed with elliptical, flat dark-brown scales with bronzy and 

 blue reflection, scales on front margin and below lateral angles whitish; hairs 

 over roots of wing dark brown. Scutellum trilobate, with vestiture similar to 

 and continuous with that of mesonotum, each lobe with a small tuft of black 

 bristles. Postnotum elliptical, prominent, with a broad, flat median carina, 

 dark brown, a group of small setse near posterior margin. Pleurae brown, coxse 

 luteous, clothed with elliptical, flat silvery white scales. 



Abdomen subcylindrical, compressed, truncate apieally and with many long 

 dark-brown terminal setse; dorsal vestiture black with a bronzy and blue 

 reflection ; venter silvery white, the colors separated at the sides in a straight line. 



Wings moderate, hyaline; petiole of the second marginal cell less than one- 

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

 cross- vein distant less than its own length from the anterior cross- vein; scales 

 of veins dense, moderate, ligulate, black, with a slight bronzy reflection on the 

 costa, densest and broadest towards tip of wing where they become subovate. 

 Halteres whitish with black knobs. 



Legs rather long and slender, black, with a bronzy reflection, the femora 

 and tibiae brassy beneath, femora silvery at base ; tarsi with a pale-brassy luster 

 below; mid tarsi with apical two-thirds of third, and all of fourth and fifth joints 

 silvery white on outer side ; hind tarsi with fourth and fifth joints white beneath, 

 except tip of fourth joint. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.8 mm ; wing 2.8 mm. 



Type : No. 12702, TJ. S. National Museum. 



Larva, Stage IV (plate 89, fig. 282). — Head subquadrate, anterior margin 

 rounded, broadest at posterior angles; antennae rather long, slender, a small 

 double hair beyond middle; upper pair of dorsal tufts in fours, lower pair of two 

 rather long hairs ; ante-antennal tuft multiple. Abdomen with the lateral hairs 

 in twos, the subdorsal tufts stellate; tracheae broad. Air-tube moderate, over 

 four times as long as wide, slightly tapering on outer third; terminal hooks 

 stout, moderate; numerous single hairs scattered rather evenly over surface, 

 those nearest apex shorter and doubled. Lateral comb of eighth segment a row 

 of rather stout single spines, becoming smaller ventrally ; tuft behind the comb 

 of two long hairs. Anal segment longer than wide, with a large dorsal plate 

 with rounded angles ; dorsal tuft of two long hairs on each side ; laterally on 

 posterior angle a single long hair; subventral tufts large, multiple, moder- 

 ately long. Anal gills equal, somewhat longer than the segment, broad, with 

 pointed tips. 



