370 MOSQUITOES OP NORTH AMERICA 



yellowish-white scales, membrane beneath dark ; hairs at ends of segments long, 

 yellowish. 



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

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

 distant rather more than its own length from anterior cross-vein ; outstanding 

 scales of veins dark brown, linear, denser towards apex of wing. Halteres 

 whitish with brown knobs. 



Legs moderate, uniform ; femora clothed above with black scales with a bluish 

 and bronzy luster, beneath broadly white to tips, knees and tips of tibiae narrowly 

 whitish ; tibise bronzy-black scaled, front and mid ones pale beneath throughout, 

 hind ones pale nearly to tip; tarsi bronzy black, somewhat paler beneath. Claw 

 formula, 0.0-0.0-0.0. 



Length : Body about 3.5 mm. ; wing 4 mm. 



Male. — Proboscis long and straight, gradually enlarged towards apex. Palpi 

 exceeding the proboscis by more than the length of the last joint, slender; end 

 of long joint and last two joints somewhat thickened and clothed with many long 

 black hairs ; vestiture black, a narrow white ring at basal third of long joint, last 

 two joints white scaled beneath. Antennae plumose; last two joints long and 

 slender, rugose, pilose, black, the others short, whitish, with black enlarged 

 rings at insertions of hair-whorls; hairs long, black; tori brown. Coloration 

 similar to the female. Abdomen elongate, broadened and depressed apicaUy; 

 pale bands on dorsum broad, occupying nearly basal halves of segments, ex- 

 panded laterally to tip on seventh segment ; lateral eUiation blackish, abundant. 

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

 sparser. Claw formula, 1.1-1.1-0.0. 



Length : Body about 3.5 mm. ; wing 3.3 mm. 



Genitalia (plate 18, fig. 131) : Side-pieces over twice as long as wide, tips 

 rounded, with low, rounded subapical prominence bearing a spine, four rods 

 with bent tips, a leaf-like appendage and a seta ; clasp-filament moderate, stout, 

 with terminal articulated spine. Harpes divided, inner branch bearing large 

 tuft of spines at tip, outer rudimentary ; harpagones divided, the four branches 

 subequal, subterminal one rounded and tubular. Unci obscured. 



Larva, Stage IV (plate 99, fig. 326). — Head rounded, somewhat wider than 

 long, bulging in region of eyes ; antennae long, rather stout, a tuft at outer third, 

 part beyond it slender; upper pair of head-hairs in fives, lower in fours, ante- 

 antennal tuft multiple. Body with skin glabrous ; lateral abdominal hairs in 

 twos after second segment, subdorsal hairs in twos ; lateral comb of eighth seg- 

 ment of many spines in a triangular patch. Air-tube four times as long as wide, 

 subfusiform, tapering towards tip ; pecten of about ten teeth on basal third of 

 tube; four tufts beyond it, subapical one moved laterally out of line, the two 

 basal tufts six-haired, the subapical one two-haired; terminal hooks minute. 

 Anal segment longer than wide, ringed by the plate ; dorsal tuft of four hairs 

 of different lengths on each side ; lateral hair single, small ; ventral brush con- 

 fined by the chitinous ring. Anal gills about as long as segment, pointed at tip, 

 equal. 



The larvae occur in ground-pools, but are most frequently found in artificial 

 receptacles. Dr. Dyar found them commonly in the cellar of a house, associated 

 with Culiseta inddens, and also obtained them in a water-barrel ; Mr. Caudell 

 found them in an old tin can. 



Coast region of southern California. 



National City, June 2, 1906 (Dyar & Caudell) ; San Diego, June 2, 1906 

 (Dyar & Caudell) ; Sweetwater Junction, June 2, 1906 (Dyar iSr Caudell) ; 

 Laguna, June 14, 1906 (H. G. Dyar) ; Avalon, June 14, 1906 (A. X. Caudell) ; 



