258 Benj. D. "Walsh on the Insects inhabiting the Galls 



% Differs from normal 9 only as follows : — 1st. The quadrate spot enclosing 

 the ocelli is larger and confluent with the eyes or only separated by a capil- 

 lary orbit. 2nd. The occiput is distinctly black, except a narrow orbit. 3rd. 

 The antenna? are 3 (not J) as long as the body. 4th. The thorax is black, except 

 the tegul ■>■, and a line on the superior margin of the collare which also extends 

 downwards on its hind margin, all greenish-white. Cenchri whitish, bth. The 

 venter is greenish-white untinged with yellow, the lateral plates black, but ter- 

 minally a little clouded with pale. 9th. The legs are not tinged with yellow. 

 7th. The stigma is uniformly pale dusky. Length % .16 inch, front wing £, 

 .17 inch. 



Two % , eight 9 , bred April 2 — 15. Distinct from the average 

 specimens of S. pomum by the greenish-white (not honey-yellow | 

 ground-color % 9 , by the brown-black flagellum of the antenna % , and 

 the black thorax and abdominal dorsum 9 . Specimens however of ,$. 

 pomum 9 which are abnormally dark are scarcely distinguishable from 

 specimens of S. desmodioides 9 which are abnormally pale; so that, if 

 captured at large, one could scarcely tell which species they belonged to. 

 From certain described species it differs precisely as the preceding. T 

 noticed the difference iu the ground color of the two species April 1(1 

 in recent specimens when placed side by side. 



No. 2lbis. Gall S. pisum, n. sp.— On S. discolor. A subspherical, pea-like, hol- 

 low, pale yellowish-green gall, always growing on the under side of the leaf. 

 and almost always from one of the side-veins, very rarely (1 specimen) from 

 the mainrih, and attached to the leaf by only a minute portion of its surface, .IS 

 — .28 inch in diameter, and a few, which were probably immature or abortive, 

 only .08 inch in diameter. Almost invariably there is but one -nil to one leaf: 

 but on 4 leaves there were two, and on 2 leaves three of them, and occasionally 

 two are confluent. The surface of the gall is without pubescence, in some smooth 

 and even, in others a little shrivelled, generally studded in the medium-sized 

 ones with 4 — 12 small, robustly conical nipples, which in the larger ones have 

 hurst into a scabrous brown scar. Only in :; out of 62 galls was there any rosy 

 ckeek, as in S. pomum. The point of attachment is marked on the upper side of 

 the leaf by a brown sub-hemispherical depression about .04 inch in diameter. 

 Abundant butlocal. Deseribed Aug. 25 from 62 freshly-gathered emails. At the 

 time the 1st partof this Paper was published I was unacquainted witli this fall, 

 which accounts for the irregularity in the numbering, {2\bis.) 



On the same bush with the above there occurred 13 galls, mostly 

 unbored, so identical in appearance with S. pomum that I did not 

 think it worth while to attempt to breed from them. On Oct. 14, out 

 of another lot of S. pisum on another bush of S. discolor, I found that 

 about one-fourth to one-fifth had a slightly rosy cheek. On this bush 

 also I met with 4 S. pomum in company with ,S'. pisum. but all empty 

 and bored, but whether bored by the Gall-maker or by the inquilinous 

 Anthonomus sycoph.am.ta. n. sp. (Coleoptera) is uncertain. In both the 

 above two cases a few S. discolor bushes were growing in the mi<lst of 



