288 MOSQUITOES OF NORTH AMERICA 



ring at basal third of long joint and a broad one at apical third. Antennce 

 plumose ; last two joints long and slender, rugose, pilose, black, the others short, 

 whitish, broadly black ringed at insertions of hair-whorls; hairs long, dense, 

 black outwardly, brown at base. Coloration similar to the female. Wings 

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

 sparser. Abdomen elongate, depressed, parallel sided; dorsal white bands 

 broader than in the female, those on sixth and seventh segments laterally ex- 

 panded, eighth segment entirely whitish scaled; lateral ciliation long, fine, 

 dense, pale yellow. Claw formula, 1.1-1.1-0.0. 



Length : Body about 4 mm. ; wing 3 mm. 



Genitalia (plate 17, fig. 126) : Side-pieces over twice as long as wide, tips 

 conically tapered ; a large quadrate outer lobe at outer third, bearing a row of 

 eight rods on its surface, those toward apex of side-piece progressively smaller. 

 Clasp-filament rather stout, uniform, gradually tapering towards tip, bearing a 

 small terminal claw and two minute setae situated on inner face before the tip. 

 Harpes divided, outer limb long and curved. Harpagones divided into several 

 large lamellce, with angular rounded corners. 



Larva, Stage IV (plate 103, fig. 344). Head rounded, broad, narrowed be- 

 fore eyes, a notch at insertion of antennae, the front margin broadly arcuate. 

 Antennae large, basal two-thirds stout, with a large hair-tuft at end and coarsely 

 spinulate, outer third more slender, bearing two long setse just before tip, a 

 long and a short apical seta, and a small digit. Eyes large, transverse. Both 

 pairs of dorsal tufts and ante-antennal tuft multiple. Mental plate small, tri- 

 angular, a central tooth and six on each side, even. Mandible quadrangular, 

 short and rather square ; two long filaments, a short filament, and a tuft of hairs 

 in notch before tip, an outer row of cilia from a collar; a row of little tufts 

 from prominences on the outer margin ; dentition heavy, four teeth on a process, 

 the first and third long ; a spine before, a double tooth at base, a broad filament 

 and seven feathered hairs within ; process below long ; slightly but obscurely 

 cleft, with hair-tufts at tip and a transverse row of little hairs near base; no 

 basal angle, the two groups of long basal hairs in line somewhat near together. 

 Maxilla elongate conical, divided by a band-shaped suture; inner half with three 

 rows of hairs, a row of long hairs at tip, continued along the suture ; outer half 

 with two filaments below the middle and a long spine on the outer side. Palpus 

 very short with rather long digits, one of which exceeds the others. Thorax 

 rather squarely rounded, wider than long ; hairs rather long. Abdomen moder- 

 ate, anterior segments shorter; lateral hairs of first two segments multiple, 

 double on the third to sixth; skin minutely spicular-pilose. Tracheal tubes 

 slender. Air-tube very long, about eight times as long as wide, slightly uni- 

 formly tapered, a ring of thick spines before the tip; pecten reaching to one- 

 fourtli; the single teeth broad and rather numerously branched; several small 

 hair-tufts scattered between the end of the pecten and the subapical spines. 

 Lateral comb of eighth segment of many spines in a triangular patch; single 

 spine elongate-elliptical, fringed with spinules which are long at the tip. Anal 

 segment as long as wide, ringed by the plate ; dorsal tuft of two long and two 

 short hairs on each side; a double lateral hair; ventral brush well developed, 

 confined to the barred area. Anal gills moderate, longer than the segment, 

 ensiform. 



The larvae live in all sorts of ground-puddles and occasionally in artificial 

 receptacles. Mr. Busck got them in Trinidad in a pool in a wood and in muddy 

 pools in a road; Mr. Urich got them in a small puddle in a drain, the water 

 covered with green algae ; Mr. Busck got them in Panama from a stagnant, ill- 

 smelling pool caused by dumping dirt, in a barrel near a dump, from a stream 

 with Anopheles, from a temporary rain-water pool, in a pool in a shaded moun- 



