320 MOSQUITOES OF NORTH AMERICA 



blackish brown. Antennas moderate ; joints subequal, rugose, pilose, black ; hairs 

 of whorls sparse, moderate, black; tori subspherical, with a cup-shaped apical 

 excavation, dark brown. Clypeus rounded triangular, dark brown, nude. Eyes 

 black. Occiput black, clothed with narrow, curved pale-bronzy scales narrowly 

 on the nape, flat ones well up the sides, pale brown above, white below, and 

 numerous erect, forked black ones on vertex ; margins of eyes white scaled. 



Prothoracie lobes elliptical, remote dorsally, brown, clothed with pale scales 

 and dark bristles. Mesonotum dark brown, with two narrow impressed bare 

 lines ; vestiture of narrow, curved golden-brown scales and stiff dark-brown 

 bristles. ScuteUum trilobate, with similar but slightly paler vestiture to meso- 

 notum, each lobe with a tuft of dark-brown bristles. Postnotum elliptical, 

 prominent, dark brown, nude. Pleurae brown, with dark spots, coxae luteous, 

 with patches of white scales and rows of pale bristles. 



Abdomen subcylindrieal, depressed, truncate at tip ; dorsal vestiture of brown- 

 black scales with a slight bluish reflection, a row of lateral segmental basal yel- 

 lowish-white triangular spots; venter yellowish-white scaled, tips of the seg- 

 ments blackish; hind margins of segments with yellowish hairs; end with 

 numerous bristles. 



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

 long as its ceU, that of second posterior cell shorter tiian its ceU; basal cross- veiu 

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

 of veins elliptical, especially towards apex, denser on second, third, and fourth 

 veins, brown, with a blue reflection on costa. 



Legs moderate, femora whitish beneath ; tibiae and tarsi black with a bronzy 

 reflection, paler beneath ; tips of tibiae black. Claw formula, 0.0-0.0-0.0. 



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



Male. — Proboscis long, straight, swollen towards apex, bronzy black. Palpi 

 exceeding proboscis by length of last two joints, slightly enlarged towards apex, 

 end of the long joint and the last two joints with long, dense, black hairs, vesti- 

 ture of bronzy-brown scales, penultimate joint with a patch of white scales at 

 base beneath. Antennae rather long, plumose ; last two joints long and slender, 

 rugose, pilose, black, others short, whitish, with black rings at insertions of 

 hair-whorls ; hairs long, dense, black. Coloration similar to the female. Abdo- 

 men elongate, depressed, somewhat expanded towards apex; dorsum with 

 broad silvery white basal segmental bands, narrower on sixth and seventh and 

 laterally expanded, eighth with lateral spots; lateral ciliation ample, brown. 

 Wings slightly narrower than in the female, venation nearly the same. Claw 

 formula, 1.1-1.1-0.0. 



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



Genitalia (plate 11, flg. 79) : Side-pieces over twice as long as wide, stout, 

 rounded at tips; inner process divided, outer part columnar, bearing three 

 notched and distorted filaments; inner part widely furcate, each part slender 

 and bearing a long filament with expanded bent tip; clasp-filament with base 

 slender and curved, tip expanded into a large rounded knob vrith a central 

 groove, outer margin bearing a row of curved spines, terminal claw scarcely 

 differentiated from them ; a minute setae on inner side. Harpes divided, inner 

 Umb long, slender, bearing a comb of spines at tip, outer also long, slender, 

 curved at end. Harpagones divided into several lamellae, inner one doubly ex- 

 panded at tip and angled. Unci forming a small basal cone. Basal appendages 

 very narrow, approximate, oblique, setose. 



The larvae live in the edges of streams and similar locations. Mr. Busck got 

 his specimens from a small swampy stream, but all had pupated, so no larvae 

 were observed. 



Panama. 



Las Cascades, Canal Zone, May 18, 1907 (A. Busck). 



