450 MOSQIHTOES OF NORTH AMERICA 



Description of Femai^, Maue, and Labta of Culex inimitabius: 



Female. — Proboscis moderately long, apical half much thickened, clothed 

 with dark brown scales. Palpi short, about one-fifth as long as the proboscia, 

 entirely dark sealed. Antennse moderately slender, the joints subequal, coarsely 

 ciliate, brown ; hairs of whorls sparse, long, black. Occiput dark brown, clothed 

 with pale bronzy-brown, narrow, curved scales ; many erect, slender forked black 

 scales dorsally; ocular margin broadly silvery white scaled; cheeks narrow, 

 clothed with white scale. 



Mesonotum brown, darker over roots of wings; vestiture of narrow, curved, 

 light bronzy-brown scales; setae sparse but very coarse, brown. Scutellum trilo- 

 bate, with vestiture similar to that of mesonotum, each lobe with a group of long 

 coarse bristles. Postnotum pale brown, with a small median carina, nude. 

 Pleurse and coxae very pale brownish above, pale yellowish below, a transverse, 

 dark diffuse stripe at middle and another at upper margin, a white pruinose 

 band between them. 



Abdomen subcylindrieal, depressed, broadly truncate at apex; dorsal vestiture 

 bronzy brown, nearly black in some lights, and with dull silvery basal bands, 

 nearly obsolete on second and third segments but broad on succeeding ones, ex- 

 panded at sides on seventh segment; first segment dark scaled and with many 

 long pale cilia ; ventral surface entirely pale ; tip of abdomen with coarse bristles. 



WiQgs broad, hyaline; scales bronzy brown, outstanding ones long and very 

 narrow, dense on second vein ; petiole of second marginal cell about one-third 

 as long as its cell, that of second posterior cell slightly shorter than its cell; 

 basal cross-vein about twice its length from anterior cross-vein. Halteres pale, 

 with blackish knobs. 



Legs slender, rather long; vestiture bronzy brown, in some lights black with 

 bluish iridescence; femora pale beneath to apices; tibiae and tarsi with a 

 pale-bronzy sheen beneath. Claw formula, 0.0-0.0-0.0. 



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



Male. — Proboscis straight, moderately long, anterior two-thirds gradually 

 thickened, clothed with deep brown scales. Palpi long and slender, exceeding 

 the proboscis by nearly the length of the last joint; vestiture entirely bronzy 

 brown ; last two joints and end of long joint slightly thickened and with sparse 

 black hairs. Antennae densely plumose; last two joints long and slender, the 

 others short, with thick black rings at insertions of hair whorls; hairs very 

 long, brovm. Coloration similar to the female. Abdomen depressed, straight 

 sided, slightly dilated at apex; dorsal white bands very narrow on second and 

 third segments, broad on succeeding ones; venter white scaled; lateral ciliation 

 moderate, pale. Wings slightly narrower than those of the female, venation and 

 vestiture nearly the same. Claw formula, 1.0-1.0-0.0. 



Length : Body about 2.5 mm. ; wing 2 mm. 



Genitalia (plate 9, fig. 57) : Side-pieces over twice as long as wide, tips 

 tapered and produced into a slender prominence, inner margin with a row of 

 slender prominences, six in number of different lengths, each bearing a rod, 

 except the subapical one which bears a leaf-like appendage. Clasp-filament 

 slightly swollen in middle, tips slender and bearing a rather long articulated 

 claw. Harpes slender vrith a long inner branch with a row of hairs at its 

 summit. Harpagones divided into a number of lamellae. 



Larva, Stage IV (plate 111, fig. 375). — Head rounded, widest through eyes, 

 a large notch at insertion of antennae, front margin arcuate. (Antennae miss- 

 ing.) Mental plate triangular, with a large prominent central tooth and eight 

 on each side, baaal ones more remotely spaced. Mandible triangular, with base 

 produced into a rounded projection; three filaments before tip; an outer row 

 of cilia from a collar ; a row of rounded conical prominences on outer margin. 



