140 MOSQUITOES OF NORTH AMERICA 



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

 of dark-brown bristles. Postnotum elliptical, prominent, dark brown, a group 

 of setae near posterior margin. Pleurae brown, coxae luteous, clothed with ellip- 

 tical, flat silvery-white scales. 



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

 dark-brown terminal setae; dorsal vestiture black with a slight metallic reflec- 

 tion; venter yellovrish white, colors separated at sides in a straight line; the 

 scales somewhat raised along the mid-ventral line. 



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

 as its cell ; that of second posterior cell about equal to its cell ; basal cross-vein 

 distant more than its own length from anterior cross- vein ; scales of veins ligu- 

 late, long, becoming broader and subcimeif orm and denser on apical half of 

 forks of second and fourth veins and apex of third, black, with a blue reflection 

 on the costa. Halteres whitish with black knobs. 



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

 whitish beneath ; tibiae and tarsi with a strong bronzy luster beneath ; mid tarsi 

 with tip of second and all of third and fourth joints silvery white on outer side ; 

 hind tarsi with first three joints narrowly silver-marked at base beneath, last 

 two joints sUvery beneath at basal two-thirds. Claw formula, 0.0-0.0-0.0. 



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



Male. — Proboscis bronzy beneath, becoming silvery towards base. Palpi small 

 and slender. Antennae similar to those of the female, the joints with a small 

 secondary subapical whorl, hairs of basal whorls longer and more abundant 

 than those of the female. Coloration similar to the female. Abdomen rather 

 long and slender, compressed, considerably expanded towards tip, the claspers 

 visible between the lateral series of long bristles. Wing with the stems of the 

 fork-cells slightly longer than in the female, basal cross-vein about its own 

 length from anterior one ; vestiture similar. Legs with a brilliant brassy luster 

 beneath on front and middle pair; middle legs slightly shorter than the front 

 ones, the tarsi with a diffused silvery luster on upper side of apical half of third 

 and on fourth joints ; hind legs with a bronzy luster beneath, the first three tarsal 

 joints with a silvery mark at the bases beneath, the last two joints with their 

 basal two-thirds white. Mid tarsi with a single large curved claw, hind tarsi 

 with two unequal ones ; formula, 0.0-0-0.0. 



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



Genitalia (plate 4, fig. 35) : Side-pieces over twice as long as wide, the tips 

 conically tapered; three long setae in a line towards the base. Clasp-filament 

 with a long, slender stem, the tip expanded into a lobed clasp ; middle lobe very 

 large, roundedly quadrate, with marginal rows of setae and one across the 

 middle; a small, rigid thickening near the base; inner lobe short, broad, 

 squarely truncate at tip ; outer lobe elliptical and bearing a long, erect spine. 

 Basal lobes of side-piece roundedly triangular, setose. Harpes slender, ellip- 

 tical, inner edge thickened, bent at tip, and obscurely dentate. Harpagones 

 and unci similar, forming small basal cylinders. Basal appendages represented 

 by two short sete on each side. 



Larva, Stage lY (plate 91, fig. 291).— Head well rounded, without lateral 

 angles; antennae rather long, slender, with a single hair beyond the middle; 

 head-tufts both double, ante-antennal tuft in threes. Lateral abdominal hairs 

 in sixes on first two segments, double on third to sixth. Comb of eighth seg- 

 ment of about sixteen teeth in a single straight row ; a long double tuft behind. 

 Air-tube fusiform, about four times as long as wide, with single hairs well 

 distributed over dorsal aspect, a row of single hairs along ventral aspect; 

 terminal hooks moderate. Anal segment longer than wide, the dorsal plate 



