454 MOSQUITOES OF NORTH AMERICA 



groups of long pale bristles and patches of whitish, suberect, broadly lanceolate 

 scales. 



Abdomen subcylindrical, truncated at tip; dorsal vestiture black with a 

 bronzy-brown reflection, a row of rather coarse yellow hairs at apex of each 

 segment; a row of smaU basal segmentary sordid ochraceous patches on the 

 sides; basal half of last segment pale scaled, its tip bristly; venter ochraceous 

 scaled, with a row of angular, subapical obscure bands with apices directed 

 forward. 



Wings rather narrow, hyaline ; petiole of second marginal cell one-fourth as 

 long as its cell, that of second posterior cell a little shorter than its cell ; basal 

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

 brown, those on costa with a blue reflection, the outstanding ones long, sparse 

 and broadly linear, the others abundant, long, narrowly ovate; fringe rather 

 narrow. Halteres pale brown. 



Legs slender; femora ochraceous at base and beneath nearly to tips; knees 

 narrowly whitish; vestiture otherwise black with a bronzy and violaceous re- 

 flection above and a stronger bronzy one beneath. Claw formula, 0.0-0.0-0.0. 



Length : Body about 4 mm. ; wing 4.5 mm. 



Male. — Proboscis straight, moderately long and slender, gradually enlarged 

 towards apex. Palpi exceeding the proboscis by nearly the length of the last 

 joint; last two joints with end of the long joint slightly enlarged and bearing 

 many brown hairs; scale vestiture bronzy brown, without annulations. An- 

 tennae slender, plumose ; last two joints long and slender, rugose, pilose, black, 

 the others short, but longer than usual, whitish, ringed with black at insertions 

 of hair-whorls; hairs long, brown. Coloration similar to the female. Wings 

 scarcely narrower than in the female, the stems of the f ork-ceUs slightly longer ; 

 vestiture similar. Abdomen elongate, slender, depressed; lateral spots more 

 whitish and tending to form bands ; lateral ciliation abundant, very long, fine, 

 yellowish brown. Claw formula, 3.1-3.1-0.0. 



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



Genitalia (plate 19, fig. 140) : Side-pieces more than twice as long as wide, 

 tapered outwardly; marginal appendages absent. Basal lobe stout, conical, 

 setose. Clasp-filament long, slender, with an articulated terminal spine. 

 Harpes furcate, semicircular, tips recurved, inner branch shorter. Harpagones 

 wanting. Basal appendages short, remote setose. Unci cantiguous, revolute, 

 forming a basal cylinder. 



Larva, Stage TV (see figure of the entire larva, plate 52) . — Head large, quad- 

 rate, as wide as thorax, wider than long, sides straight, a broad notch at inser- 

 tion of antennae, front margin nearly straight. Eyes large. Antennae very long, 

 slender, densely spined, a large tuft from base of outer sixth, the part beyond 

 slender ; two very long hairs before tip, a long hair, a short one and a digit at 

 apex. Upper pair of dorsal head-tufts multiple, lower pair single ; ante-antennal 

 tuft multiple. Mental plate broadly triangular, a large central tooth with eight 

 on each side, sixth and seventh large and longer than adjacent ones, eighth very 

 small. Mandible subquadrangular ; two filaments outwardly before tip, two 

 shorter filaments, two feathered hairs and two small serrate filaments arising 

 from their bases; an outer row of cilia from a collar, a few very small hairs on 

 outer margin ; dentition of four divaricate ensif orm teeth on a process, the first 

 the largest ; two long, spine-shaped teeth before, a conical tooth at base, a fila- 

 ment and a row of fine feathered hairs within ; process below widely furcate, with 

 patches of hair ; four filaments within ; basal angle very slender and sharp ; a 

 row of stout hairs at base. Maxilla elongate, irregular, divided by a suture; 

 inner half with long hairs toward base; a tuft of long hairs at apex running 

 along suture; outer half with filaments very small, some short hairs next the 



