48 KANSAS UNMVF.RSrrV QlARl KRLV. 



GENERA OF PSII.OPINAE. 



1. Fourtli longitudinal vein not forked, Apforthits. n. gen. 

 Fourth vein forked. 2. 



2. Tegular cilia black, third vein gently curved back at tip, scutel- 

 lum with four large bristles, Psi/opus Meigen. 



Tegular cilia j^ale, third vein distinctly curved forward at the tip, 

 scutellum with only two large, and usually also two small, bristles. 3. 



3. Face wide, front deeply excavated, Gnamptopsilopus, n. gen. 



4. Face narrow, front scarcely excavated, LeptortlictJirum, n. gen. 



The name rsilopiis is preoccujjied in the Mollusca, as O.sten Sacken 

 and others have mentioned. .V new name should not be proposed 

 for the dipterous genus without a careful examination of several of 

 the older European works, which are inaccessible to me. It is 

 probable that, as Bigot suggests, PsUopodiiis Rondani is the legiti- 

 mate successor of the old name. 



C34AMPTOPSILOPUS n. gen. 



[yiunnptds, bent). 



Includes all that part of the old gewm Psi/opus in which the species 

 have pale tegular cilia. Other characters are as above mentioned. 

 Psilopus scintillatis Lw., hi color Lw. , tcjicr Lw., and filipcs Lw., are 

 typical speci es. 



APTORTHUS n. gen. 



('^ without; pUirthof^, branch)- 



Structure of the head as in Psilopus, front very deeply excavated. 

 Posterior crossvein shorter and less oblique than in Psilopus, its 

 anterior end nearer the middle of the wing; fourth vein with a rounded 

 but rather short curve forward, at a distance beyond the crossvein 

 equal to the length of the latter; beyond this curve gradually retiring 

 to its former course, so that the first ]josterior cell has a long, slender, 

 gently narrowed tip; the end of the fourth vein is before the apex. 

 Aptorthus albiciliatus n. sp. 



Male. Face broad, with thin )'elIow pollen ; fronl shining green, the 

 two ocellar bristles black, a bunch of bristles behind these and another 

 on each side next the orbit yellowish; antennae small, black, the arista 

 dorsal, rather short, the hairs of the second joint of the antenna 

 yellow; palpi and proboscis pale; cilia of the inferior orbit white, 

 rather bushy. Thorax shining blue-green, with black bristles; 

 pleurae slightly white dusted; tegula white, its tip black, with long 

 whitish-yellow cilia; halteres yellow, the peduncle brownish; scutellum 

 with four bristles, the inner pair somewhat larger than the outer. 

 Abdomen shining blue-green, with rather thick and coarse hair, which 

 is black at the base and somewhat rusty, or in some lights yellowish. 



