Q 



70 MOSQUITOES OF 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 tibire narrowly 

 whitish ; tibiae 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. Antennas 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 apically; 

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

 panded laterally to tip on seventh segment ; lateral ciliation 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 incidens, 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 & Caudell) ; 

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



