AQUATIC INSECTS IN NEW YORK STATE 407 



claws. Wings with brown scales, a quadrangular patch of yel- 

 low scales just proximad of the fork of R^ and R^ covering a 

 short section of both R^ and the costat vein; an oblique patch 

 at tip of Rj, crossing the media, leaving the tips black of all 

 excepting R^; a few scattered pale yellow patches of scales else- 

 where; and the posterior margin brown scaled, with patches of 

 white ones at the tip of Gu^. Halteres pale yellow at base, 

 the knob infuscated. Length 3^ to 5 mm, exclusive of antennae 

 and wings. 



Female. Brown, as with the male; abdomen more uniformly 

 brown, covered with nearly erect, fine, yellow hairs; scutellum 

 and metathorax with a fine dark line; tarsal claws all simple; 

 wings as with the male but wider in proportion to the length; 

 A'enation as in figure 5; the basal section of R4-1-5 distad of the 

 R-M cross vein, as the male. Everything else asi in the male. 

 Length 4 to 6 mm. 



Larva. Three regions may be distinguished in the larva, viz 

 the head, thorax and abdomen. The head is rounded, brown in 

 color, and completely chitinized; the eyes are situated laterally 

 and seem to be of two kinds; one is compact and more or 

 less circular in outline, the other, visible only in older larvae, is 

 a crescentlike body compounded of ommatidia-primordia of 

 adult eyes. On a level with the eyes and cephalad of them are 

 the antennae, and a trifie caudad of the base of these on the 

 dorsal surface, arranged in a transverse row, are six feathered 

 hairs. These are not placed on a band of pigment as is said 

 to be the case with maculipennis. Between the base of 

 the antennae and the base of the maxillary palpi, on a chitin- 

 ized prominence, is a conspicuous branched hair. Near the tip 

 on the dorsal surface of the labrum are two simple hairs pro- 

 jecting forward; these are more caudad than in maculipen- 

 nis. Back of the transverse row of feathered hairs is another 

 transverse row composed of four small feathered hairs ; between 

 the latter are usually nine more or less distinct pigment spots, 

 the largest in the center, the others arranged around it. At the 

 extreme cephalic end, at each side of the labrum, is a dense 

 brush of brown hairs ; another smaller brush is at the tip of the 

 labrum and on the ventral surface of the labrum are several tiny 

 tufts of hairs just in front of the mouth opening. The piece 

 which carries the tufts on the sides of the labrum is called the 

 scutum of the second metamere or clypeus. The antennae are 

 two jointed, the first short and apparently immovable; the 

 second elongate, free, bearing two rather long spines and two 

 short ones, and a six branched hair, (Nuttall shows four in 

 maculipennis). About one third of its length from the 



