AQUATIC INSECTS IX NEW YORK STATE 387 



to these on dorsum, each branch being- subdivided into five 

 smaller branches or papillae. Length ll-13mm. Width of 

 head about 1mm. Of anal portion Ifmiu. [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 

 broAvn 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 canon. July 8-11, 18!)3. This branch or side caSon, is 

 one down which the Hance trail leads, being situated about 55 

 miles in a straig-ht 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 A'egas 

 X. 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 [pi .35, 

 fig. 10]. The mandibles have a pair of apical bristles; labruin, 

 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 3.J, fig.4-7 



Some specimens of larvae and pupae sent me by Professor 

 V. L. Kellogg, of Stanford University, collected in Santa Cruz 

 mountains, dift'er from all larvae and x>upae so far described. 



Larvae. Length 6 to 7mm. Pale brownish gray above, with 

 whitish venter and suture. Head whitish above, the mar^ns 

 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 



