446 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



6. Anterior margin of the clypeus yellowish; antennae piceous; mesepisternum with 



a pale spot basally ; tibiae black apically autumnalis Rohwer, p. 447. 



Clypeus black; antennae black; mesepisternum black; apex of the posterior tibiae 

 black castaneae Rohwer, p. 447. 



7. Fifth to eighth antennal joints without a ventral apical curved projection; post- 



ocellar area and area latrad of the lateral ocelli without large punctures; (clypeus 

 shining, subangulately emarginate; supraclypeal area convex, not moundlike; 



lower angle of cheek not produced) virginica Rohwer, p. 446. 



Fifth to eighth antennal joints with a curved ventral apical projection; postocellar 

 area and area latrad of the ocellus with large punctures 8. 



8. Scutellum with a pale spot; apical margin of the clypeus pale; antennae entirely 



pale; lower angle of cheek not produced; (clypeus broadly subsquarely emargi- 

 nate; lobes truncate; supraclypeal area convex) quercivora Rohwer, p. 448. 



Scutellum black; apical margin of clypeus black; antennae, except apices, pice- 

 ous ; lower angle of cheek produced 9. 



9. Supraclypeal area flat; wings dusky; apical sternite black, .errans Rohwer, p. 446. 

 Supraclypeal area convex, in general outline triangular; wings hyaline; apical 



sternite rufous castaneae Rohwer, p. 447. 



DIMORPHOPTERYX ABNORMIS Rohwer. 



Dimorphopteryx abnormis Rohwer, Proc. IT. S. Nat. Mus., vol. 41, 1911, p. 406. 



This species is remarkable in the convex scutellum and the loss of 

 'the transverse radius. 



DIMORPHOPTERYX MELANOGNATHUS Rohwer. 



Dimorphopteryx melanognathus Rohwer, Proc. U. S. Nat. Mus., vol. 39, 1910, p. 205; 

 vol. 41, 1911, p. 405. 



The description of this species, dealing with the clypeus, may be 

 elaborated as follows: Clypeus deeply, arcuately emarginate, almost 

 subangular; lobes broadly triangular; supraclypeal area flat except a 

 small rounded median tubercule. 



DIMORPHOPTERYX ERRANS Rohwer. 



Strongylogaster pinguis Dyar, Trans. Amer. Ent. Soc, vol. 22, 1895, p. 311; Journ. 



N. Y. Ent. Soc, vol. 5, 1897, p. 199 probably. 

 Parasiobla rufocinctus Howard, Insect Book, 1904, pi. 14, fig. 26. 

 Dimorphopteryx pinguis errans Rohwer, Proc. TJ. S. Nat. Mus., vol. 41, 1911, p. 406. 



As far as I am able to ascertain from the published records the host 

 plants of this species are black oak, birch, and linden. It may be that 

 in Dyar's rearing he had more than one species included. As far as 

 recent rearings are available no species has more than one host plant, 

 and all the larvae belonging to this genus are so similar superficially 

 that field determinations or determinations not based on adults can 

 not be relied upon. 



This species is known from New York State only. 



DIMORPHOPTERYX VIRGINICA Rohwer. 



Dimorphopteryx pinguis virginica Rohwer, Proc. U. S. Nat. Mus., vol. 41, 1911, p. 406. 



This may be considered as a good species. The following characters 

 will aid in the identification. Lobes of the clypeus about twice as 



