110 MOSQUITOES OF NOKTH AMERICA 



brown with a silvery-white pruinosityj hairs of whorls long, rather sparse, 

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

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

 metallic reflection, a small, white spot at vertex, which is continued into a 

 narrow border along the eyes, widening into a patch below; two long setae at 

 the vertex and a row of short ones along margin of the eyes. 



Prothoraeic lobes elliptical, distinctly separated, clothed with flat scales, 

 blackish brown, with a minute white tip and a broad silvery-white base. Meso- 

 notum clothed with elliptical, flat dark-brown scales with a bronzy and blue re- 

 flection ; scales on front margin and below lateral angles whitish ; bristles at roots 

 of wings dark brown. Scutellum trilobate, with vestiture similar to and con- 

 tinuous with that of mesonotum, each lobe with a small tuft of black bristles. 

 Postnotum elliptical, prominent, dark brown, a group of small, pale setae near 

 posterior margin. Pleurae dark brown, the coxae luteous, clothed with elliptical, 

 flat silvery-white scales. 



Abdomen subcylindrical, compressed, truncate apically, and with many long, 

 dark-brown terminal setae ; dorsal vestiture black, with a slight, bronzy and blue 

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



Wings moderate, hyaline ; petiole of second marginal cell one-third as long aa 

 its cell, that of second posterior cell shorter than, its cell ; basal cross- vein dis- 

 tant less than its own length from anterior cross- vein; scales of veins ligulate 

 on fifth and sixth veins, short, dense, cuneiform on forks of second ajid fourth 

 veins and on third vein ; black, with a blue reflection on costa. Halteres whitish 

 with black knobs. 



Legs moderate, slender, black with bronzy reflection, the femora whitish 

 beneath ; tibiae brassy beneath ; front and mid tarsi with brassy luster beneath, 

 hind tarsi bronzy. Claw formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 3 mm. 



Male. — Proboscis similar to that of the female. Palpi shorter than in the 

 female, clothed with silvery scales throughout. Antennae similar to those of the 

 female, a small secondary whorl at tip of each joint, the basal whorls longer and 

 more abundant than in the female. Coloration similar to the female. Wiags 

 slightly narrower than in the female, the stems of the fork-cells longer, vestiture 

 sparser. Abdomen subcylindrical, compressed," expanded at tip ; terminal setae 

 divided into four groups. Front and mid legs with a strong brassy luster 

 beneath; mid tarsi with the last four joints arcuate inwardly, apical half of 

 second and last three joints with a strong, pale-brassy luster on outer side. Mid 

 tarsi with only one claw, those of the hind tarsi unequal ; formula, 0.0-0-0.0. 



Length : Body about 3.5 mm. ; wing 3.8 mm. 



Genitalia (plate 2, fig. 8) : Side-pieces over twice as long as wide, the tips 

 concavely tapered, somewhat excavated at tip for insertion of clasp-filament, 

 inner margin elliptically thickened ; a slight hairy inner lobe ; three setae in 

 line below middle of side-piece. Clasp-fllament with a long, slender stem, tip 

 divided into three lobes; outer lobe erect, with a slightly hooked tip and row 

 of setae ; middle lobe uprightly slender, smooth ; inner lobe projecting at right 

 angles, broadly rounded, bearing a row of setae towards the apex. Harpes 

 slender, long, tips curved and obscurely dentate. Harpagones and unci forming 

 small basal cones. Basal appendages represented by five small setae on each 

 side. Penultimate segment with a rounded, projecting, hairy lateral angle. 



Mr. Busck found the larvae in a bamboo stump in bamboo woods, but pre- 

 served no larval skins. We have also a specimen taken by Mr. Urich, but vrith- 

 out breeding data. 



Trinidad, British West Indies. 



