440 Professor Williston on the 



2. HemerodromiafSp. 



$ . Head black, thickly grey poUinose. Eyes narrowly separated 

 in the middle of the face. Antennae and proboscis light yellow. 

 Thorax reddish yellow, the mesonotum somewhat greyish pollinose, 

 and with feeble indications of longitudinal stripes. Legs light 

 yellow ; front femora greatly thickened, and with a distinct emar- 

 gination for the reception of the tip of the tibiae. Wings as in 

 H. defessa. 



One specimen. In the absence of specimens for com- 

 parison, it is hazardous to say that this is the same as 

 H. oratorio, Fall., but I can find no important diflferences 

 from Loew^s description. I suspect that H, empiformis, 

 Say, may also be the same species (Coquillett has wrongly 

 identified it). Coquillett makes no mention of the con- 

 tiguity of the eye in his H. rogaforis, and leaves it to be 

 inferred that the bristles of the thorax are microscopic. 

 If such be the case, the two species are distinct. 



For those species of Hemeroch'omia, in the sense of 

 Loew, in which the neuration is normal, Coquillett has 

 recently resuscitated the table name Mantipeza, Rondani, 

 referring all the others to Hemerodromia, with the excep- 

 tion of H. scapularis, Loew, for which he creates the 

 genus Neoplasia. Hemerodromia precatoria. Fall. (JOT. 

 Tnonostigma, Meigen), is a true M an tip eza, in Coquillett's 

 sense, but he leaves it in Hemerodromia, so that it is difficult 

 to say just what his conception of Mantipeza really is. 

 In the examination of the descriptions and specimens of 

 most of the known species of Semper odromia, in the sense 

 of lioew, I find the following different combinations of 

 characters : — 



1. Anal cell present, discaland second posterior cells 

 also present. — Mantipeza of Coquillett. 



This is Hemerodromia of Bigot, and it should be con- 

 sidered that of Meigen also. 



2. Anal cell present, second basal cell present, discal 

 cell wanting. — Mantipeza of IBigoi . 



This includes H. nigriventris, H. defecta, etc. Mr. 

 Coquillett also includes in this group H. alhipes, Walker. 

 Mr. Coquillett's acumen in the detection of so many of 

 Walker^s defectively described species is to be commended. 

 In the present case, however, has he some special infor- 

 mation concerning the type of H. albipes? Mr. Walker 



