472 MOSQUITOES OF NOKTH AMEKICA 



upper fork of second vein ; a very long spot on third vein to margin ; a small one 

 on upper fork and all of lower fork of fourth vein ; both forks and outer half of 

 stem of fifth vein white; sixth vein white with a short black spot before tip, and 

 a very long one at base; fringe checkered black and white, white spots at apices 

 of third, lower branch of fourth, upper branch of fifth, and at sixth veins ; out- 

 standing scales dense, narrowly ligulate. Halteres entirely pale. 



Legs long, rather slender ; vestiture brownish black ; femora and tibiae with 

 small spots of pale-yellow scales, bases and apices yellow scaled ; all the tibiae 

 more or less ochreous scaled beneath ; tarsi with yellowish- white ring at base and 

 apex of each joint, scales between bluish black ; last joint of front tarsi black, 

 that of mid and hind ones white. Claw formula, 0.0-0.0-0.0. 



Length : Body about 6 mm. ; wing 6 mm. 



Male. — Proboscis longer than in the female. Palpi exceeding the proboscis 

 by about the length of the last joint, last joint pointed, penultimate joint some- 

 what thickened; terminal two-thirds of long joint and last two joints densely 

 clothed with long yellowish hairs ; vestiture predominatingly of ochreous yellow 

 scales, the long joiat with blackish rings at middle and before apex, penultimate 

 joint with a black ring at middle, last one with a patch of black scales near base. 

 Antennae plumose ; last two joints long and slender, rugose, pilose, blackish, the 

 others short, slender, pale, each roundly enlarged towards a sinuous black ring 

 at insertion of hair- whorl ; hairs long, dense, fine, pale brown and yeUow ; pile 

 on penultimate joint produced into long delicate hairs. Coloration similar to 

 the female. Abdomen long, slender, depressed ; dorsal apical spots broader than 

 in the female, lateral ones tending to form basal bands; last segment entirely 

 yellow and white scaled; lateral cUiation abundant, fiiie, yellowish. Wings 

 narrower than in the female, the stems of the fork-ceUs a little longer; vestiture 

 sparse. Last tarsal joint of front legs yellow scaled. Front and mid-tarsal claws 

 unequal ; claw formula, 1.1-1.1-0.0. 



Length : Body about 7 mm. ; wing 5.5 mm. 



Genitalia : Side-pieces more than twice as long as broad, tips conically ta- 

 pered, marginal appendages of three stout spines and four smaller ones situated 

 below middle of side-piece articulated in a line. Clasp-filament moderate, 

 curved, slightly enlarged at base, with a small articulated terminal appendage. 

 Harpes single, stoutly coliminar bearing a tuft of divergent spines at tip. 

 Harpagones broad, subquadrate, distally with three large, stout, unequal curved 

 teeth. Unci taper-pointed, with revolute margins, forming a large basal cone 

 and with several teeth below apex. No basal appendages. 



Larva, Stage IV. — Head subquadrate, slightly wider than long, broadest pos- 

 teriorly. Antennae small, subcyliadrical, slightly tapered, smooth; a long 

 double hair at middle ; three long setae, a short seta and a digit at tip. Eyes 

 large, pointed. Mouth-brushes inserted on anterior lobes of head, folded down- 

 ward and backward. Mental plate semicircular, excavate behind, with a central 

 tooth and seven on each side, all about alike and equally spaced, except the last 

 which is small. Mandible much reduced, elongate quadrangular, the dentition 

 occupying most of the terminal area; a very small filament before tip, outer row 

 of cilia short, coarse, appressed to dentition ; dentition large, of five teeth, the 

 first, third and fifth longer; an area of confluent spines below; basal angle 

 obsolete; a small process with a tuft of hairs; a row of fine hairs within. 

 Maxilla quadrangular and divided by a band-shaped suture, inner half some- 

 what produced; inner half with a long row of cilia, a tuft of stout spines at tip ; 

 outer half with a tuft of spines adjoining apical tuft and a single long spine ; 

 two small filaments near center; a row of short teeth next the palpus. Palpus 

 short, stout; five minute digits at tip. Skin of body coarsely spicular. Thorax 

 rounded, about as long as wide; hairs moderate, short. Abdomen stout, seg- 



