278 MOSQIHTOES OF NORTH AMEKICA 



Male. — Proboscis straight, longer than in female, a broad pale ring beyond 

 middle, slightly enlarged towards apex. Palpi exceeding proboscis by nearly 

 the length of last joint, end of long joint and last two joints with long, dense 

 brown hairs ; vestitnre of dark-bronzy scales, a pale ring on the long joint before 

 the middle, a few pale scales at base of penidtimate joint. Antennae plumose; 

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

 black rings at insertion of hair-whorls; hairs long, dense, dull brown. Color- 

 ation similar to the female. Wings narrower than in the female, the stems of 

 the fork-cells a little longer, vestiture more sparse. Abdomen long, slender, de- 

 pressed and expanded towards apex ; dorsal white bands distinct on second to 

 fifth segments, obsolete on sixth and seventh ; lateral ciliation long and abun- 

 dant, pale brownish yellow. Claw formula, l.I-l.l-O.O. 



Length : Body about 4.5 mm. ; wing 3.5 mm. 



Genitalia (plate 16, fig. 118) : Side-pieces over twice as long as wide, coni- 

 cally tapered at tip ; marginal appendages on a subapical truncated prominence 

 consisting of three rods with hooked tips and a leaf-like appendage and a seta. 

 Clasp-filament stout, rather long, curved, with a small articulated appendage. 

 Harpes furcate, lower branch curved with a rounded tip, outer bearing a dense 

 terminal tuft of spines. Harpagones furcate, divided into numerous teeth. 



Larva, Stage IV (plate 107, fig. 357). — Head rounded, wider than long, eyes 

 bulging at the sides ; both pairs of dorsal tufts in threes, ante-antennal tufts 

 multiple. Antennae elevated on a triangular insertion, long, curved, terminal 

 third narrow, at its base bearing a very large tuft of feathered hairs, below which 

 the thick basal part is densely spined ; three long setae, a short one, and a digit on 

 a pedestal at tip. Mental plate quadrate, a little expanded outwardly; a stout 

 central tooth and eight on each side, the penultimate one a little larger and dis- 

 tinctly separated. Mandible quadrangular, nearly square ; two large filaments 

 and two small ones from a notch before tip ; an outer row of cilia from a collar; 

 outer margin straight, with nine tufts of fine hairs ; dentition projected in line 

 with margin, of four teeth on a process, the first the longest; two spines before, a 

 large trifid tooth at base, a broad serrate filament and a row of feathered hairs 

 within; process below long, furcate, with four tufts of hair; basal angle small 

 but sharp, with three long hairs within ; a row of five hairs at base. Maxilla 

 conical, divided by a suture; inner half rather densely haired; a tuft of long 

 hairs at tip, running down along the suture nearly to base ; outer half with two 

 filaments below the middle and a spine on the other side. Palpus small, slender, 

 with four irregular terminal digits. Thorax rounded, subquadrate, wider 

 than long ; hairs abundant, long. Abdomen moderate, anterior segments short 

 and transverse ; lateral tufts multiple on first segment, triple on second, double 

 on third to sixth. Tracheal tubes slender. Air-tube long, about six times as 

 long as wide, uniformly and very slightly tapered ; pecten small, reaching about 

 one-fourth the length of tube, followed by five or six hair-tufts along posterior 

 edge; pecten tooth a moderate spine with wide base, from which arise two or 

 three long branches. Lateral comb of eighth segment of numerous scales in a 

 triangular patch; single scale elongate, uniform, with a triangular base, 

 entirely fringed by uniform spinules. Anal segment longer than wide, ringed 

 by the plate ; dorsal tuft of long hairs ; ventral brush well developed, placed in 

 an excision in the chitinous ring, not exceeding the barred area. Anal gills 

 small, tapered, not longer than the segment. 



Mr. Busck found the larvae abundantly in water in a hollow palm-trunk and 

 less abundantly in a pot-hole in coral rock in woods, in the latter case associated 

 with Psorophora infine. 



Island of Santo Domingo, West Indies. 



Santo Domingo, larvae in a hole in a rock, August 9, 1905 (A. Busck) ; San 



