416 MOSQUITOES OF NORTH AMEEICA 



Abdomen subcylindrical, truncate at tip, clothed dorsally with black scales 

 with a coppery or blue reflection, a row of lateral triangular segmental sordid 

 silvery spots ; venter dark with indistinct sordid silvery basal s^mental bands. 



Wings moderate, hyaline; petiole of second marginal cell about one-fifth as 

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

 vein distant about twice its own length from anterior cross-vein ; scales of veins 

 brown, outstanding ones rather broadly ovate outwardly on second to fourth 

 veins and upper branch of fifth. Halteres whitish, with dark knobs. 



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

 femora whitish beneath to near apices. Claw formula, 0.0-0.0-0.0. 



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



Male. — Proboscis long, straight, slender, expanding towards apex, black- 

 scaled. Palpi exceeding the proboscis by more than the length of the last joint, 

 slender, black, with black hairs on end of long joint and on last two joints, which 

 are slightly enlarged; vestiture bronzy brown. Antennae plumose; last two 

 joints long and slender, rugose, pilose, black, the others short, whitish, with 

 thick bla(^ rings at insertion of hair-whorls; hairs long, dense and black. 

 Coloration simUar to the female. Wings narrower than in the female, the 

 stems of the fork-cells slightly longer. Abdomen subcylindrical, somewhat 

 longer than in the female; lateral white spots tending to form dorsal bands; 

 ciliation coarse, dark, but not forming a distinct lateral fringe. Claw formula, 

 1.0-1.0-0.0. 



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



Genitalia (plate 11, fig. 76) : Side-pieces over twice as long as wide, tips con- 

 ically tapered; a prominence rising somewhat beyond middle, divided into two 

 branches, the outer long, narrow, bearing five rods and a filament at tip, inner 

 forked, each branch bearing a filament expanded near apex and terminating in 

 a sharp point. Clasp-filament slightly swollen at base, tip expanded narrowly 

 with five short setas along outer edge ; an inserted terminal claw. Harpes with 

 a long, slender inner branch with a short comb of spines at tip; outer branch 

 short, curved. Harpagones with a slender branch denticulate at tip and other 

 smooth lamellae. Basal appendages oblique, setose. 



Larva, Stage IV (plate 106, fig. 354.) — Head rounded, widest through eyes, 

 bulging on sides, a large notch at insertion of antennae, front margin arcuate. 

 Antennse large, curved, basal two-thirds thick and well spined, with a large tuft 

 from a notch; two long subapical setae, a long seta, a short one, and a digit at 

 tip. Both pairs of dorsal head-hairs single; ante-antennal tufts multiple. 

 Mental plate small, a large central tooth with tapered tip, four small teeth on 

 each side, followed by two larger somewhat projecting ones and a small seventh 

 tooth basally. Mandible quadrangular ; three filaments before tip ; an outer row 

 of cilia from a collar ; a row of rounded transverse prominences from outer mar- 

 gin bearing short hair-tufts ; dentition of four irregular teeth with some short 

 spines below; two spines before, a smooth filament, a stout spine and row of 

 feathered hairs within ; process laelow shortly angled at base, obscurely furcate, 

 with a row of hairs along outer side and a tuft at tip ; basal angle small, a row 

 of stout hairs within ; a row of long basal hairs. Maxilla elongate, rather nar- 

 row, divided by a suture; inner half with long spines on margin, basal ones 

 feathered, a patch of coarse hairs within and two rows of cilia towards base ; 

 a row of long hairs at tip, running down along sutiire, a stout articulated spine 

 at outer third next suture, from inner half ; two filaments below at basal third 

 from outer half. Palpus very small, conical, with four long claw-like digits. 

 Thorax rounded, wider than long. Abdomen moderate, anterior segments 

 shorter; lateral hairs in threes on first segment, in twos on second, in threes on 

 third to sixth; skin pilose. Air-tube slender, nearly straight, tapering, about 

 six times as long as wide ; pecten dense, of very long teeth, reaching to basal 



