AQUATIC INSECTS IN NEW YORK STATE 387 
to these on dorsum, each branch being subdivided into five 
smaller branches or papillae. Length 11-13mm. Width of 
head about Imm. Of anal portion 13mm. [The figure given 
by Townsend shows the mandible with the apical bristles. ] 
Pupa. General color pale brownish yellow on the thoracic 
portion, abdomen darker; head, wing and leg cases, and fila- 
ments pale yellowish, the head sometimes brownish; prothoracic 
filaments arising from a single stalk on each side, which 
branches at base into usually eight filaments; these do not sub- 
divide. Third and fourth abdominal segments with five or six 
brown hooks or spines on posterior margin of dorsum. Length 
excluding filament, 4.5mm. 
Cocoon or case. Massed in coral-like aggregation. Open at top 
but enveloping all of the pupa, except the filaments or the ex- 
treme anterior portion of the hunchbacked thorax. Length 
4mm. Abundant in a small stream in one of the branches of 
Grand cafion. July 8-11, 1898. This branch or side cafion, is 
one down which the-Hance trail leads, being situated about 55 
miles in a straight line n. n. w. of Flagstaff Ariz. 
Some larvae which I received from Professor Needham, to 
whom they were sent by Professor Cockerell from Las Vegas 
N. M., may belong here. The general color however is reddish 
and it is only about 7 or 8mm in length. The labium has a 
more irregular outline than most of the other species [ pl.35, 
fig.10]. The mandibles have a pair of apical bristles; labrum, 
hypopharynx, and mandibles resemble those of other species; 
on the head are six blotches arranged symmetrically about a 
median axis; each blotch consisting of two or three confluent 
black spots. 
Simulium, species 
Plate 35, fig.4-7 
Some specimens of larvae and pupae sent me by Professor 
V. L. Kellogg, of Stanford University, collected in Santa Cruz 
mountains, differ from all larvae and pupae so far described. 
~ Larvae. Length 6 to 7mm. Pale brownish gray above, with 
whitish venter and suture. Head whitish above, the margins 
brown. The fans with about 30 rays, its longer cilia conspicu- 
ous. The secondary fan at the base of the peduncle of the 
larger fan and usually composed of curved hairs, consists here 
of coarse, straight hairs. The mandible with apical pair of 
bristles [fig.6], maxillary palpus with some stout setae, labrum 
