582 [Dkcemher 



Others on April 28 were yellowish opaque with whitish mottlings and 

 a honey-yellow vitta occupying i of the dorsum on 4 — 6 of the middk' 

 dorsal joints. Another specimen was yellowish immaculate. On April 

 8 most of the galls still contained the insect in the larva state, and in 

 a few the insect was still in that state April 3lJ and May o. 



Pupa. — Does not differ structurally from that of S. braKsiroiifi's. 

 The first pupse were found April 8, when the abdomen was tinged with 

 sanguineous, and the fore part of the body, and especially the eyes, were 

 strongly sanguineous. Another pupa occurred April 30 and others May 

 8. One that had been a week out of the cocoon was. on April 15, all 

 bright pinkish-scarlet or sanguineous. The empty pupal integument 

 fl 8 specimens) is whitish, scarcely tinged in front with fuscous. Length 

 of the pupa (2 dried specimens) .15 inch. 



Imago. C. s. strobiloides, n. sp. S $. — The imago differs from 

 that of C. s. brasstcoides only as follows : — 1st. The % antennae are gene- 

 rally 21-jointed (2-|-19), but in one S one antenna is 22-jointed (2-)-20). 

 the two last unconnected by any pedicel. I noticed April 10 in the 

 antenna of a recent % (not the one with one 22-iointed antenna) that 

 the last joint is small and cylindrical, equal in length to the penulti- 

 mate but apparently connate with it. 2nd. The hair on the thorax is 

 whitish, not blackish. 3/v/. The dorsum of the abdomen 9 is more nearly 

 free from hair, and laterally the subterminal hair of each joint is longer. 

 denser and whiter, and there is never, so far as I could observe in the 

 recent specimens 9 i any subterminal, glabrous, impressed, transverse 

 line on the middle joints. Afh. The origin of the anterior branch of 

 the 8rd longitudinal wing-vein is always obsolete for a short spac^, as 

 it sometimes is also in C. s. sdiqva n. sp.? and occasionally in C. s. 

 hrassicoides. The dimensions are about the same as in (J. .s. hrassi- 

 coides. Five % , twenty-eight 9 . The first imago appeared April 5 and 

 the last May 10, the $ 9 ? a*^ usual, much more numerous than the % % . 

 On April G a 9 laid very numerous eggs, which were cylindrical, 3 

 times as long as wide, .03 inch long, blunt-pointed at each end, and of 

 a blood-red color, in the bottle in which I had confined it. 



No. 3. GrALL S. STROBiLiscus. n. sp. — On S. rostrata, a high north- 

 ern willow not found near Rock Island. I only know this species from 

 a single dried and mature specimen received from Mr. Bebb. and ga- 

 thered in Winnebago Co., on the extreme northern border of Illinois. 



