84 MOSQUITOES OF NQRTH AMEEICA 



Antennce moderate, the joints slender, subequal, rugose, coarsely pilose, black; 

 tori subspherical, with a cup-shaped apical excavation, yellowish brown, with a 

 whitish pruinosity; hairs of whorls long, rather abundant, black. Clypeus 

 rounded, convex, luteous, pruinose. Eyes separated at vertex by a narrow wedge, 

 bluish black. Occiput clothed with flat brown scales with a metallic reflection, 

 a small white spot at vertex and a silvery patch below ; two long setas at vertex 

 and shorter ones behind margins of eyes. 



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

 bronzy violaceous, white at tip and base ; a row of setas along anterior margin. 

 Mesonotum clothed with elliptical, flat dark-brown scales with submetallic re- 

 flection ; scales on anterior margin and lateral angles whitish ; setse 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, with a low, broad median carina, brown, ^ 

 group of small setae near posterior margin. Pleurae dark brown, coxk luteous, 

 clothed with elliptical, flat silvery-white scales. 



Abdomen subcylindrical, expanded towards tip, with many long, dark-brown 

 terminal set^e; dorsal vestiture black with a slight bronzy and blue reflection; 

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



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

 as long as its cell ; that of second posterior cell as long as its cell ; basal cross-vein 

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

 veins broadly linear, black, with bronzy reflection on costa, denser and broader 

 apically. Halteres whitish with black knobs. 



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

 whitish beneath, tibiae and tarsi with pale-brassy luster beneath ; mid tarsi with 

 apical half of second, and all of third, fourth, and fifth joints white on outer 

 side. Claw formula, 0.0-0.0-0.0. 



Length : Body about 2.5 mm. ; wing 2.3 mm. 



Genitalia (plate 4, fig. 18) : Side-pieces narrow elongate, tips conically 

 tapered ; basal lobes rounded triangular, setose ; three long setae in a row ; clasp- 

 filament with slender stem, the tip expanded into a cup-shaped clasp with three 

 lobes ; inner lobe slender and smooth ; middle lobe broad, with truncate excavate 

 tip with rows of setae; outer lobe elliptical. Harpes curved, forming a cone, the 

 harpagones and unci forming similar smaller cones. Basal appendages small, 

 each with two sets. 



Larva, Stage IV (see figure of entire larva, plate 45). Head rounded, with 

 an angle on each side behind the eyes ; antennas small, with a minute hair-tuft 

 beyond the middle; head-hairs short, multiple tufts; eyes very small. Thorax 

 transverse, rounded subrectangular, mesothorax slightly protuberant laterally, 

 lateral hairs very long, abundant, dorsal ones in short stellate tufts. Abdomen 

 elongate, submoniliform, the segments slightly longer posteriorly, equal in 

 diameter, lateral hairs on the first and second segments in fours and threes, 

 double on segments three to six, single on seventh segment ; subdorsal and sub- 

 ventral hairs in short stellate tufts, the subdorsal hairs in two tufts on each seg- 

 ment. Air-tube about five times as long as wide, subfusiform, the tip small and 

 bearing a pair of slightly curved spines dorsally, the surface covered with rather 

 numerous single hairs uniformly distributed, only the most apical ones shortened 

 and doubled. Lateral comb of eighth segment a long, uniform row of closely set 

 teeth, nowhere doubled, becoming smaller ventrally; hair-tuft posteriorly to 

 comb of two long hairs. Anal segment about as long as wide, with a somewhat 

 angled dorsal plate; dorsal tuft of two long hairs on each side, lateral tuft at 

 angle of plate of a single long hair ; subventral tuft a tuft of short stellate hairs. 

 Anal gills rather short, equal, broadly ensiform, showing fine branching tracheas. 



