48 KANSAS ^•xIVF.Rsn'^■ orAinF.Ri.v. 



C EN ERA or PSII.Ol'INAE. 



1. Fourth longitudinal vein not forked. Apiorihiis. n. gen. 

 Fourth vein forked. 2. 



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

 lum with four large bristles, Psilopus Meigen. 



Tegular cilia j^ale, third vein distinctly cur\ed forward at the tip, 

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



3. Face wide, front deeply excavated, Giuxmptopsilo/yiis, n. gen. 



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



The name Psilopus is preoccupied in the Mollusca, as Osten Sacken 

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

 for the dipterinis genus without a careful examination of several of 

 the older ICuropean works, wliich are inaccessible to me. It is 

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

 mate successor of the old name. 



CNAMPTOPSILOPUS n. gen. 



{ijiKniiptoK, bi'Ut). 



Includes all that part of the old gcnm Psi'/opi/s in which the species 

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

 Psilopus scintillaiis Lw., hicolor I,w. , inter I,w., and filipcs Lw. , are 

 typical species. 



APTORTHUS n. gen. 



(_ti, witliout: )>'iirtliii.i, braiicli). 



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

 Posterior crossvcin shorter and less obli(|ue 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 posterior cell has a long, slender, 

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

 Aptorthus albiciliatua n. sp. 



Male. Face broad, with thin velhnv pollen; fron' 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 rustv, or in some lights vellowish. 



