INSECUTOR INSCITI^ MENSTRUUS 135 



one female has the marginal cell open while another female 

 and a male have this cell closed. 



In the Ohio Naturalist, vol. 14, 1914, p. 340, Prof. Jas. S. 

 Hine suggests that Volncella ardua Wied. might be a synonym 

 of F. tympanitis Fabricius. I was inclined to the same view 

 until I saw the paper by Mik quoted above. There the state- 

 ment is made that the type of ardua (a female) is a Phala- 

 cromyia, in other words, has the marginal cell open. In five 

 specimens of tympanitis before me, all females, the marginal 

 cell is closed. The two species should therefore be held apart, 

 at least until definite proof is forthcoming that the same vari- 

 ability occurs that has been indicated for vaga and incommoda. 



SOME NEW AMERICAN HYMENOPTERA 



By J. C. CRAWFORD 



Below is given a table of the American genera, exclusive of 

 Ccelioxys, assigned by Ashmead to his subfamily Ccelioxyinae. 

 As Prof. Cockerell has long ago pointed out, these are not all 

 closely related and must be split up into several groups, so my 

 table is one of convenience only. 



Of the genera tabulated, Dioxys and Neopasites are closely 

 related and the group easily recognized by the bidentate man- 

 dibles. Neolarra and Phileremulus are related and character- 

 ized by the narrow stigma and the very short marginal cell. 

 The American species referred to Phileremus are, I think, not 

 that genus and are true Epeolines with only two cubital cells. 

 Oreopasites is unknown to me, but from the description it 

 appears to be somewhat closely related to the true Phileremus. 

 Holcopasites stands by itself and the coarse sculpture and rost- 

 riform labrum distinguish it from the other American genera. 

 Townsendiella, new genus, also stands alone, in general habitus 

 curiously resembling the Neolarra group. 



TABLE OF GENERA 



1. Mandibles bidentate at apex 2. 



Mandibles acute at apex 3. 



