262 Benj. D. Walsh on the Insects inhabiting the Galls 



cither, 6 — 9 very slowly shorter and shorter; the scape black, with joint 1 some- 

 times pale rufous below, the flagellum brown-black, generally dull rufous or 

 reddish-brown above, except towards the base, always bright rufous beneath, 

 except at the extreme base. Thorax tinged with rufous, especially above : a 

 coarse longitudinal line on the disk of each lateral lobe, sometimes with a dot 

 inside its posterior end, and sometimes a slenderer longitudinal line on the 

 front of the anterior lobe, a band near the tip of the scutel, a pair of dots trans- 

 A-ersely placed in the hollow behind it, an abbreviated band on the succeeding 

 carina, and generally in the hollow between the carina and the basal plate an 

 abbreviated transverse line, and sometimes the edges of the basal plate border- 

 ing the basal membrane, all black. Abdomen sometimes tinged with rufous; 

 joint 1 sometimes with the edge bordering the basal membrane, and an obscure 

 dot on its dorsal tip, black. Ovipositor concealed; its sheaths tipped with fus- 

 cous. Cerci tipped with fuscous. Legs greenish-white; tarsi, especially the 

 hind ones, fuscous; extreme tip of the hind tibise more or less obfuscated. 

 Wings hyaline ; veins black; costa and stigma pale green. Length 9 .22 — .24 

 inch; front wing 9 -23 — .25 inch. 



% Differs from the normal 9 only as follows : — 1st. The body is much slen- 

 derer in proportion than is usual in this genus. 2nd. The general color is whit- 

 ish, not pale green. 3rd. There is a quadrate black spot enclosing the ocelli 

 and running backwards on to the occiput, swallowing up the black dot on the 

 occiput and confluent with the two black dots behind the antennae, ith. The 

 antennas are i longer than the body, joints 3 — 5 subequal, 5 a trifle the shortest, 

 (5 — 8 very slowly shorter and shorter, 9 full as long as 8, the scape black, with 

 joint 1 basally pale green, the flagellum rufous above, bright rufous beneath. 

 5th. The entire meso- and metanotum, excepting the pale tegulae and cenchri, 

 but including the basal plates, is black. 6th. In the abdomen the basal i — } of 

 dorsal joints 1 — 6, nearly the whole of joint 7, and a dorsal line on joint 8, are 

 all superiorly black; lateral plates all whitish; basal membrane whitish. 

 Length % .IS inch ; front wing % .19 inch. 



One S , three 9 , one 9 bred May 2 from the Tenthrediuidous gall 

 >S'. pomum n. sp. of the preceding year's growth, and another 9 , Au- 

 gust 5, troni the Cecidomyidous gall S. brassicoidcs Walsh of the same 

 year's growth; the other 9 and the % captured at large. Most prob- 

 ably the larvae already described (p. 255) as seen Sept. 9 in a jar of S. 

 pomum galls belonged to meiidicus. Comes very near verfebratus Say 

 (1 9 ) and integer Say (2 9 ), but differs in the antennae not being eu- 

 tirely black or fuscous, and in the transverse carina behind the anten- 

 nae being straight or nearly straight, while in vertebratus 9 it is in the 

 form of a widely truncate angle of 60°, and in integer 9 it forms an an- 

 gle of about 90° or 100° with its apes a little rounded so as to approxi- 

 mate to a curve. I notice further that vertebratus 9 , which in extent 

 of black markings is intermediate between mendicus 9 and integer 9 > 

 differs from both in the clypeus being emarginate in a circular arc of 

 only 45°, instead of 90° — 120°. But for the above differences, the 

 three species might be considered as varieties, some more highly color- 

 ed than the others, as in JV. s. pomum 9 • 



