AMEKICAN HYMEXOPTERA. 91 



wrinkled, jiarapsidal grooves very distinct ; sides of second abdominal segment, 

 posteriorly, densely microscopically punctate. In the male the antenna is 15- 

 jointed and more or less iufuscated, and the thorax is almost entirely black. 

 Length from 2 to 3.5 mm. 



Baron Ostcii Siickcn .siys tliat tlie black on the niesonotuni varies 

 in extent, but that there is always some yellow on the sides of the 

 raesonotuni in the female. This is true of all tiie specimens that I 

 have seen from the east<>rn part of the eountry, but T have seven 

 females bred fi'om Colorado galls that are indistinguishable from 

 ouerntiix, except that tiie mesonotum is entirely black, the only ru- 

 fous coloration on the thorax being a narrow strip on the collar im- 

 mediately in front of the teguhe, and the antenna is black with the 

 joints only rufous. Five males of this Western form have the 

 thorax entirely black in every case, while a single male from Ottawa, 

 Canada, the only other male that I have seen, has the thorax black, 

 except a narrow margin on the propleurie. 



Judging from Harris' description, it seems probable that his speci- 

 mens came from galls of Holcaspii (jlobulns, and it is from this gall 

 that Fitch and Osten Sacken obtained their specimens. My speci- 

 mens were bred from galls of Cyidps strobilaiia 0. S. both in Mich- 

 igan and Iowa, and from galls of Holcaspis rubens Gill, and Dryo- 

 j)li<iiifa hrerljx'iniata Gill, taken at jNlanitou, Colorado, by the writer. 



As these Western f(/rms are all constant in their coloration, and 

 are easily separated by it from Eastern specimens, I will suggest for 

 them the varietal name eolovadensis. 



^tyiicrgns garr.vaiia Gill. 



Si/nenins (iiirri/iiiiii (iill., Can. Eut. xxv, 1893. p. 110, 9 %. 



" Female. — (leneral color rufous, with tips of mandibles, compound eyes, vertex 

 between ocelli, occiput, lower half of the mesopleura?, metathorax. pedicel of ab- 

 domen and two blotches on second al)doniinal segment, one next the petiole and 

 one just beyond the middle of the dorsum, black. Head : face entirely yellowish 

 rufous, coarsely striated and sparsely set with short hairs; vertex rug()So-i)unc- 

 tate; antennaj 14-ji)inted, and in color like the face, a little infuscate at the tip. 

 Thorax above a little darker rufous than the face, transversely rugose ; parajjsidal 

 grooves narrow and rather indistinct, but extending to the collar, sparsely set 

 •with short recumbent hairs; scutellum coarsely rugose, the fovese obliqu(^ and 

 shining black at the bottom ; mesothoracic i)leui-ai coarsely aciculate ; in two 

 specimens the lower half only is black, and in two others a little smaller, the 

 entire pleuite are black. Abdomen : petiole coarsely striated ; second segment 

 very smooth and shining and finely punctured on outer third. Legs, including 

 coxiE, uniform light yellow, except the tarsi of the hind pair and the tips of the 

 last tarsus in the others, which are black. Wings hyaline, nervures light, areolet 

 obsolete. Length 2.5-3 mm. 



"Mule. — The male differs from the female as follows: Length 2i mm.; vertex 



TRANS. AM. KNT. SOC. XXIII. MARCH, 1896. 



