592 MOSQUITOES OP NOETH AMERICA 



cross- vein; veins brownish; scales rather broadly triangular, black and white 

 intermixed, the dark ones predominating; a moderate patch of black scales at 

 base of third vein; outstanding scales ligulate, on terminal portion of wing 

 narrowly lanceolate, mostly dark but with a number of pale ones intermixed ; 

 fringe entirely dark. Halteres white, tips slightly dusky. 



Legs moderately long, rather stout; femora clothed with black and white 

 scales intermixed, the white ones predominating ventrally, extreme base and 

 apex and a narrow subapical ring white; tibiae black, with many little white 

 patches ; tarsi black, each joint with a white basal ring, first jdnt with a median 

 one in addition; on the front tarsi the last two joints, on tiie middle tarsi the 

 last joint entirely black; setae rather long, coarse and black. Claw formula, 

 0.0-0.0-0.0. 



Length : Body about 5 mm. ; wing 4.5 mm. 



Mcde. — Proboscis straight, dark scaled, a narrow pale ring beyond the middle. 

 Palpi exceeding the proboscis by nearly the length of the last two joints, which 

 are long, slightly tluckened and upturned; vestiture black, bases of last two 

 joints narrowly white, a bare white ring at the false articulation of the long 

 joint; apex of long joint and last two joints with dense, long black hairs. 

 Antennae plumose ; last two joints long, slender, pilose, the others short, with a 

 thickened black ring at origin of hair- whorl and pale tip; hairs of whorls 

 abundant, long, brown. Coloration similar to the female. Abdomen long, 

 depressed, with long and abundant pale brown lateral ciliation. Wings nar- 

 rower than in the female, the stems of the fork-cells longer, the scaling on the 

 veins less abundant. Claw formula, 3.1-2.1-0.0. 



Length : Body about 5 mm. ; wing 3.7 mm. 



Genitalia (plate 22, fig. 156) : Side-pieces more than twice as long as wide, 

 apical lobe well developed, continuous with side-pieces, forming an apical 

 prominence ; no basal lobe. Clasp-filament stout, strongly inflated, mostly on 

 inner side; a rather large terminal articulated spine. Harpes flat, concave, 

 inner margin thickened and revolute, curved over and minutely trifid at tip. 

 Harpagones with a narrow ligulate base, apex triangular, widened and bearing 

 four large smooth setae with minutely divided apices. Unci approximate, form- 

 ing a blunt-tipped cone, the margins strongly revolnte and approximate 

 medially. 



Larva, Stage IV (see figure of the entire larva, plate 59). — ^Head rounded, 

 wider than long, narrowed before eyes, a slight notch at insertion of antennae 

 front margin broadly arcuate. Antennae long, but not extraordinarily so, 

 subcylindrical, slightly tapered, slightly widened at tip, a little curved, sparsely 

 spined all over ; a moderate tuft a little before middle ; two long subapical spines, 

 a long spine and two digits at tip, the central one larger and broader than the 

 other. Eyes large, transverse, pointed. Upper pair of dorsal head-tufts mul- 

 tiple, lower triple, ante-antennal tuft multiple. Mental plate elongate triangu- 

 lar, longer than wide, a central tooth with thirteen on each side, all much alike, 

 basal ones a little larger. Mandible quadrangular, nearly smooth without; a 

 single filament near tip; an outer row of stout cilia from a distinct collar; six 

 small feathered hairs on outer margin from angular elevations; dentition of 

 four teeth on a process ; a filament above, a group of five small irregular ones at 

 base, a long double dentate filament and branched seta within; process below 

 furcate, with patches of hair; six hairs within; nine long setae at base. Maxilla 

 nearly spherical, divided by a narrow, curved suture ; inner half hairy ; a line of 

 long hairs at tip ; outer half with a large process next the suture and a spine on 

 the other side. Palpus very small, basally placed; four digits small, the two 

 central ones almost obsolete. Thorax rounded, wider than long, robust; hairs 

 abundant but not long, the subdorsal prothoracic ones single. Abdomen stout, 



