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



brown-black, its terminal i beneath often tinged with rufous. Thorax always 

 with an obscure subquadrate spot where the mesonotal grooves decussate, and a 

 more definite elongate one on the anterior i of the anterior lobe, the two often 

 confluent, the tip of the scutel sometimes, and always the entire metanotum in- 

 cluding the basal plates, all black. Very rarely the entire mesonotum is black. 

 Cenchri whitish. Pectus immaculate, except in one dark 9 where it is slightly 

 obfuscated. Dorsum of the abdomen sometimes with only the basal edge of joint 

 1, black, and all the sutures toward the base, dusky; usually with mere or less 

 of its basal h black; rarely with its whole or nearly with its whole surface black- 

 ish or black. Lateral plates honey-yellow, very rarely (1 9 ) basally black. 

 Venter always immaculate. Ovipositor honey- yellow, its sheaths black. Basal 

 membrane whitish. Legs honey-yellow, the four front legs with their coxse and 

 trochanters generally more or less whitish; tips of all six tarsi, especially the 

 hind ones, lightly obfuscated, as are also sometimes the extreme tips of the hind 

 tibite. Winr/s hyaline; veins black, the costa honey-yellow; stigma basally 

 honey-yellow, terminally fuscous. Third submarginal cell usually longer than 

 wide, sometimes square, very rarely and only in a single wing 3 or 4 times wider 

 than long or entirely obsolete. Length J .12— .22 inch; front wing J .14 — .25 

 inch. 



% Differs from normal 9 01ll J as follows : — 1*^. The quadrate spot on the ver- 

 tex is larger, often confluent with the eyes either throughout its length or in a 

 single point, and never separated from them but by a capillary orbit. 2nd. The 

 occiput, except a very narrow orbit, is decidedly black. 3i-d. The antennae are 

 * (not .}) as long as the body, almost invariably dull rufous above, except to- 

 wards the base, and bright rufous or pale dull green beneath, except towards the 

 base, very rarely (1 % ) colored as in 9- ^ !l - Tne entire thorax is black, except 

 the tegulse and an elongate-triangular line on the superior margin of the collare, 

 which are honey-yellow, and the cenchri which are whitish, bth. The dorsum 

 of the abdomen is black, 2 or 3 of the terminal joints sometimes, and occasional- 

 ly joint 1 or joints 1 and 5 also, lightly tipped with yellow, the lateral plates ho- 

 ney-yellow clouded with dusky, especially towards the base. Venter immacu- 

 late. 6th. The costa is scarcely pale, and only the extreme base of the stigma is 

 Whitish. Length % .17— .20 inch : front wing % .IS— .20 inch. 



Twenty-six % , forty-six 9 , bred April 16 — 25. A single 9 bred 

 many years ago, and according to the label from this gall, differs from 

 all the other 9 in the thorax being as black as in % . Distinct from 

 longicornis Say, which is described by Say, without any reference what- 

 ever to sex, though Mr. Norton quotes him as describing the 9 exclu- 

 sively, {Proc. B. S. N. II 1861, p. 158,) by neither sex ever having 

 "two black spots beneath the wings," and by the antennae being rather 

 short than long. From nigritus % Nort., fulvipes % Nort., pallicomu 

 9 Nort., proximatus 9 Nort., obscurus 9 Nort., luteotergus % Nort., 

 erythroga&ter 9 Nort,, Marylandicus % Nort., and subalbatus 9 Nort., 

 (which last seems to belong to the genus Messa,) distinct by the pale 

 face b 9 and many other characters ; and from brunneus 9 Nort, by the 

 body 9 being always more or less marked with black. The other de- 

 scribed N. A. species, so far as known to me, are entirely different. 



