AQUATIC INSECTS IN NEW YORK STATE 441. 
mandible just above the lateral line, one pair below this one 
‘and a little cephalad; another pair about one fourth of the 
length of the head caudad of these but lying as far below the 
-jJateral line as the first is above. Directly caudad of the first, 
but midway between the front and hind margin of the head, 
is another. Close te the dorsal suture, one fourth the length 
-of the head cephalad of the caudal margin, is still another; and 
finally there is a single one on each side at the base of the 
labium [fig.10]. 
The ventral surface of the labrum is shown in figure 9. The 
hypopharynx resembles that shown in plate 50, figure 5; and 
the maxilla that shown in figure 6. The supe ante is as shoes 
‘on plate 48, figure 9e, its free end having four to six filaments, 
the apical pair being stoutest. This member may be bent for- 
ward and the filaments then spread out, fanlike. The “ jointed 
appendages” | fig.9j7] are well developed; each is apically expanded 
into a handlike process with seven or eight “fingers.” These 
appendages are attached at a point near the anterior margin 
of the labrum. The mandibles | fig.12] have each five blunt teeth, 
a fringe of coarse branched hairs projecting mesad,and two stout 
setae on the dorsal surface near the base. The labium [fig.10] 
possesses about 19 blunt teeth, no suture being visible between 
it and the lateral (or ventral?) sclerite. The antennae are of 
moderate length [fig.11] and bare, with three terminal, jointed 
appendages. The thoracic and abdominal feet are as on plate 
50, figures 7 and 12; but the abdominal legs appear a little 
longer in proportion to their diameter. The entire body of the 
larva is almost devoid of hairs excepting the caudal tuft. 
Pupa [fig.13]. The pupa is of a fuscous color with a greenish 
tinge; its thorax is apparently without either tracheal gills or 
‘breathing tube. On the dorsal posterior margins of each of the 
abdominal segments excepting the first and last there are 10 to 
12 short, stout, caudad projecting teeth, the two or three lying 
nearest the lateral margin being smaller than those more dor- 
sad; and on the ventral posterior margin of the abdominal 
segments excepting the first, second and last there are six or 
eight stout teeth projecting cephalad. At the anal end of the 
last segment are three pairs of short hollow filaments, which 
may have a respiratory function. The length of pupal life is 
about two days. 
This pupa greatly resembles that of Diamesa culi- 
coides as figured by Heeger in Sitzb. d. k. Akad. d. Wiss. 
Wien., 1853, excepting that in the latter there are eight caudal 
filaments instead of six. 
Described from specimens taken in Cascadilla creek, Ithaca 
DY. April 1902. 
