ABT. 17. NORTH AMERICAN PHOROCERA ALDRICH AND WEBBER. 43 



chaetae ; scutellum black with three long and one shorter apical pair 

 of marginal bristles; sternopleiira with three bristles. Abdomen 

 black, gray pollinose, the anal segment yelloAvish, destitute of discal 

 bristles on the intermediate segments. Mid tibiae with two bristles 

 on the outer front side near the middle; hind tibiae unevenly ciliate. 

 Hypopygium black, gray pollinose, the inner forceps stout, slightly 

 curved inward, shiny black, and densely clothed with long fine hairs ; 

 outer forceps about the same length, very slender and tapering to a 

 fine point. 



Length 9 to 11 mm. 



Redescribed from numerous specimens: Two without locality but 

 with printed name labels are probably from the lot mentioned by 

 Williston; one without locality was submitted to Brauer and Ber- 

 genstamm and identified by them as Parexorista futUis Osten 

 Sacken; four are from Oregon (Koebele) ; one without locality was 

 bred from Vanessa atalanta Linnaeus (Riley collection) ; one from 

 Salem, Massachusetts, was reared from Pyrausta nuhilalis Huebner 

 (Craig) ; a series at the gypsy moth laboratory were reared from 

 Ennomos siibsignarius Huebner; other specimens unreared are from 

 Indiana (Aldrich), Massacliusetts (Webber), New York, and Kaslo, 

 B. C. (Currie). The type in the Museum of Comparative Zoology 

 at Cambridge has been examined by the junior author; it has no 

 locality, but was reared from Vanessa aialanta. Linnaeus. 



The species has been reported from New Jersey (Smith Catalogue, 

 both editions) ; Ottawa, Canada (Gibson, Rept. Ent. Soc. Ont.) ; 

 Connecticut (Britton. Check list). Coquillett reported it as reared 

 from Malacosoma thoracica Stretch in California, and in a manu- 

 script note he added Malacosoma disstria Huebner at Albany, New 

 York, by Lintner. Tothill reared it from Isia isaheJJa Smith and 

 Abbot at Ottawa, Canada. 



Townsend has called attention to the fact that this species lays 

 microtypp eggs on foliage, which are swallowed by its host. 



Genus PHOROCERA Robineau-Desvoidy. 



Phorocera RObineau-Desvoidy, Myodaires, 1830, p. 131. T.vpe designted 

 by Robineau, Dipt. Env. Paris, vol. 1, 1863, p. 509, as Tachina assimilis 

 Fallen ; this was not originally included, but on the same page Robineau 

 makes his agilis, originally included, a synonym of as.timilis. 



Pales Robineau-Desvoidy, Myodaires, 1830, p. 154 (not Meigen, 1800, not 

 available but still preoccupying the name). Type, strcnua Robineau- 

 Desvoidy, by designation of Robineau, Dipt. Env. Paris, vol. 1, 1863, 

 p. 519 (=Tachina processionea Ratzeberg). 



Chaetogena Rondani, Prod; Dipt. Ital., vol. 1, 1856, p. 68. Type desig- 

 nated, Tachina assimiUs Fallen. 



Scotia Robineau-Desvoidy. Dipt. Env. Paris, vol. 1, 1863. p. 255. T.vpe 

 designated, plaeida Robineau-Desvoidy {=TacMna prandis Zetterstedt). 



