Vol. XXvi] ENTOMOLOGICAL XEWS 17 



Descriptions of three new species of the Dipterous 

 genus Sciapus with a key to the 

 North American species. 

 By M. C. Van Duzee, Buffalo, New York. 

 In working out the following table of spedes, I have used 

 Prof. J. M. Aldrich's key, published September, 1904, in the 

 Transactions of the American Entomological Society, as a 

 !)asis. but uniting under Sciapus the genera Psitopdinus and 

 nosoma there used, as is done by most of the European 

 lors now. This key places eighteen qiecies not contained 

 in that of Prof. Aldrich. Four of these were described by Mr. 

 OMjuillctt, five by Mr. Bigot and nine by mysdf. Of these 

 \a.i\., three are described in this paper, as follows: novehoro' 

 censis. banksii, and bradleii; three in the Canadian Entomolo- 

 gist, chalyhcus, digitatus, and iM^'iM<iMM.f ; and three, furcatus, 

 ' • rarJi, and poUinosus, will be more fully described in my 

 It of the Dolichopodidae of Okefenoke Swamp, (jeorgia. 

 Five species in this key described by ^fr. Bigot seem to be 

 recognizable; at least they seem to be distinct from all other 

 known species from North America, but his carolintnsis and 

 pallescens I could not do anything with. Mr. Bigot does not 

 tiK-ntion any hairs on the face of his occidmlalis, pampoecUns 

 aivl hirhtius, so I take it that they have the face bare, as no 

 doubt they have ; he also states that occidmtalis has the arista 

 lon^. so I phce it in the section where the arista is at least two- 

 thirds as long as the body ; the long bristles of the thorax and 

 abdomen would indicate that it bekmged there. He sutes that 

 the femora of hirtuius are reddish with violet reflections: 

 therefore. I take it that his spec im en was somewhat immature 

 and the femora should be blaclcHfh witfi violet or green re- 

 flections, as this is sometimes the case with immature speci- 

 mens with dark femora. For the same reason I have placed 

 his occidmtalis in the group with blackish femora ; he describes 

 them as reddish brown. 



Key to Ikr North Awterieam S^ttits of Scia^ms. 



I C ><■ tegube black or dark brown S 



Ci <ic tegttfae pale 67 



