AEDES ONONDAGENSIS 631 



bristles. Postnotum elliptical, prominent, nude, blackish, with a slight 

 pruinosity. Pleurae and coxa brownish, clothed with flat white scales and 

 pale bristles. 



Abdomen subcylindrical, flattened, posterior segments tapering ; dorsal vesti- 

 ture of flat sordid-white scales, with two large patches of black ones on each seg- 

 ment, the patches becoming smaller posteriorly and absent on last segment ; first 

 segment with a large patch of white scales and with many long, white hairs; 

 venter clothed with sordid-white scales, a very narrow median broken line of 

 black ones or row of rather large black spots ; cerci black ; setae mostly pale. 



Wings rather broad, hyaline ; petiole of second marginal cell somewhat shorter 

 than its cell, that of second posterior cell also somewhat shorter ; basal cross-vein 

 distant about its own length from anterior cross-vein; vestiture of black and 

 white scales ; on the costal, subcostal and first veins and on the basal half of the 

 fifth vein these scales are evenly intermixed, on the second vein and fourth 

 vein to its fork the scales are almost entirely white, while on the third vein, the 

 forks of the fourth vein, and the ends of the forks of the fifth vein they are 

 almost wholly black; outstanding scales narrowly lanceolate, both black and 

 white; fringe dark with a white reflection which gives a mottled appearance. 

 Halteres yellowish, with white-scaled knobs. 



Legs rather slender; femora clothed with whitish scales, mixed with a few 

 black ones dorsally, these predominating at apex, extreme tip narrowly white ; 

 tibiae with whitish scales with black ones intermixed which tend to form lines 

 dorsally and ventrally and a small annulus before tip of hind ones ; tarsi black 

 scaled, with a white ring at base and apex of each joint ; hind tarsi with the first 

 joint also largely white scaled in the middle and the last joint largely white; 

 fore tarsi with apex of second and all of last three joints black ; mid tarsi with 

 apex of third and all of last two joints black. Claw formula, 1.1-1.1-1.1. 



Length: Body about 5 mm. ; wing 4.7 mm. 



Male. Palpi exceeding the proboscis by nearly the length of the last joint, 

 which is somewhat swollen ; vestiture blackish with white scales intermixed ; end 

 of long joint and last two joints Avith long blackish-brown hairs. Antennae plu- 

 mose, the last two joints long and pilose, the rest short, blackish at insertions of 

 hair-whorls ; hairs long and dense, brown and black. Coloration similar to the 

 female. Wings narrower than in the female, the stems of the fork-cells a 

 little longer; vestiture less abundant. Abdomen long, depressed, with dense, 

 pale, lateral, ciliation. Claw formula, 2.1-1.1-1.1. 



Length : Body about 6 mm. ; wing 4 mm. 



Genitalia : Side-pieces more than twice as long as wide, apical lobe well 

 developed, rounded, running uniformly down to base ; basal lobe quadrate, pro- 

 tuberant, clothed with short coarse setae from tubercular bases, from its lower 

 angle a stout thick spine and a shorter divided one. Clasp-filament slender, 

 long, swollen medianly, distally serrate and bearing several short setae, a long 

 slender articulated terminal spine. Harpes rather narrow, concave, slightly 

 curved, margins re volute, inner one thickened, curved over at tip in a short 

 point. Harpagones slender, columnar, uniform, with an articulated filament 

 at apex which is ligulate, a little expanded beyond middle and tapered to a point 

 at tip, shaft with a few setae. Unci approximate with revolute margins forming 

 a short stout cone. Basal appendages narrow, with four stout spines at the tip. 



In the race onondagensis the stem of the harpago is slender, as in curriei 

 (plate 28, fig. 189) ; in the race quaylei it is stouter (plate 28, fig. 190). 



Larva, Stage IV (plate 121, fig. 419). Head rounded, narrowed before eyes, 

 the front margin arcuate. Antennae subcylindrical, small, slightly tapered, 

 rather densely spined all over ; a small tuft before middle ; four spines at tip, two 

 of which are slightly subapically removed ; a short process. Eyes large, trans- 



