332 MOSQUITOES OF NORTH AMERICA 



with slight luster; pleura green, with patches of white scales; abdomen depressed, 

 truncate at tip, clothed above with dark scales, with distinct coppery luster, the bases 

 of the segments with lateral triangular silvery white spots; venter dull whitish- 

 scaled, unhanded; wings with the scales along the veins dusky, long and very nar- 

 row; legs dark-scaled, with bronzy luster, the underside of the femora pale-scaled; 

 tarsi not ringed; claws simple. Length, 4 mm. 



Male. — Palpi long and slender, very slightly longer than the proboscis, dark- 

 scaled, with bronzy luster and without annulations; head and mesothorax colored 

 as in the female; abdomen long and slender, dark-scaled above, with coppery luster, 

 the segments with basal silvery white lateral spots; venter pale-scaled. Length, 

 3 mm. 



Thirty-nine specimens, C6rdoba, Mexico, bred from larvae in water in a hollow 

 tree (F. Knab). 



Type.— Cat. No. 11969, U. S. N. M. 



Descbbption of Female, Maim, and Labva of Ctilex besteictoe: 



i^emaZe.— Proboscis rather long and slender, uniform, labellae conically 

 tapered ; vestitnre black with a bronzy luster ; setae minute, curved, black, those 

 on labellas more prominently outstanding. Palpi slender, nearly one-third as 

 long as proboscis, black scaled, some pale scales at apex. Antennae with joints 

 subequal, rugose, pilose, black; tori subspherical with a cup-shaped apical ex- 

 cavation luteous brown, darker within ; second joint slightly enlarged, pale at 

 base; hairs of whorls sparse, moderate, black. Clypeus rounded triangular, 

 dark brown, nude. Occiput brown, clothed with narrow, curved bronzy-brown 

 scales on vertex, fiat white ones on sides, margin of eyes silvery-white sealed; 

 many erect, forked bronzy-brown scales on vertex ; a row of bristles along margin 

 of eyes. 



Prothoracic lobes elliptical, remote dorsally, green, clothed with white scales 

 and brown bristles. Mesonotum greenish brown, with two narrow impressed 

 bare lines ; vestiture of narrow, curved bronzy-brown scales, anterior margin 

 and angles with whitish scales; bristles long, coarse, brown, abundant. Seu- 

 tellimi trilobate, brownish, clothed with narrow, curved pale scales, each lobe 

 with a tuft of long brown bristles. Postnotum elliptical, prominent, brownish 

 pruinose, nude. Pleurae and coxae green with patches of white scales and rows 

 of brown bristles. 



Abdomen subcylindrical, depressed, truncate at tip; dorsal vestiture black 

 with a strong coppery reflection ; a row of basal, segmental, triangular ; lateral, 

 dull silvery- white patches ; venter dull silvery-white scaled; a row of pale bristles 

 at posterior margins of segments ; tip of abdomen with coarse bristles. 



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

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

 vein nearly twice its own length from anterior cross- vein ; scales blackish brown 

 with a blue reflection on costa, the outstanding ones linear, dense on all the 

 veins. Halteres whitish, with darker knobs. 



Legs moderate; femora bronzy black, whitish on under side nearly to tip; 

 knees not white scaled ; tibiae and tarsi entirely dark scaled with a strong bronzy 

 and blue luster. Claw formula, 0.0-0.0-0.0. 



Length: Body about 3.5 mm.; -wing 3.7 mm. 



Male. — Proboscis long, straight, gradually enlarged to apex, entirely bronzy- 

 black scaled. Palpi exceeding proboscis by about half the length of last joint, 

 slender, terminal portion scarcely thickened, last segment shorter than penulti- 

 mate ; tip of long and last two joints with a few stiff black hairs ; vestiture en- 

 tirely dark with strong bronzy and blue reflections. Antennae plumose ; last two 

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

 rings at insertions of hair-whorls ; hairs long, dense, brown. Coloration similar 

 to the female. Wings narrower, the stems of the fork-cells and vestiture about 

 the same. Abdomen elongate, depressed, thickened apically ; lateral segmental 



