94 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



PROTEPACMUS, new genus (Bombyliidae). 



Allied to Alepidophora, but wings much longer and with three sub- 

 marginal cells; abdomen elongated but rather broad, the sides with 

 rather long, pale reddish stiff hairs. Face prominent ; antennae ap- 

 parently ordinary ; proboscis not elongated ; hind femora not hairy, 

 but with a row of stout bristles; hind tibiae without hairs or bristles 

 on inner side, but with stout bristles (about 480 microns apart) ; 

 costa with short bristles ; praef urea short ; end of second vein directed 

 upward, ascending vertically to the costa ; upper branch of third 

 vein also directed upward to the costa, its terminal part parallel 

 with second vein; base of upper apical submarginal cell for basad of 

 base of the cell below it, the second vein very slightly bent at basal 

 corner, the bounding vein below weak; base of lower apical submargi- 

 nal cell sharply truncate; discal cell very long, the discal cross- vein 

 far beyond its middle ; four posterior cells, all open on margin, the 

 second extremely widely open ; anal cell narrowly open at end. 



In my key^ this runs to 34. It is certainly close to Cyllenixi^ 

 agreeing in most details of the venation, but the shape of the second 

 posterior cell is quite unlike that of Cyllenia or T&momyza. There 

 is also evident affinity with the Californian Exepaemus, but that is 

 a more hairy insect, and the venation differs in detail. 



PROTEPACMUS SETOSUS. new species. 



Length 10.5 mm.; wings a little over 8 mm., hyaline, veins pale 



ferruginous; head and thorax dark brown (probably black in life) ; 



abdomen somewhat paler, the sutures not conspicuously pallid; 



abdomen elongated, but rather broad, its length 7 mm., width near 



base 3.5 mm. The discal cross-vein is only slightly oblique. The 



following measurements are in microns : 



Width of upper apical submarginal cell 

 near end 320. 



First posterior cell on first submarginal— 1120. 



First posterior on lower apical submar- 

 ginal 1376. 



First posterior on wing-margin 224. 



First posterior on second discal 720 (Same in Alepidophora pealei). 



First posterior on second posterior. 1632. 



Discal cell on first basal 2320 (1872 in Alepidophora pealei). 



Discal on second basal 480. 



Discal on second posterior 320. 



Second posterior on wing-margin 1520. 



Second posterior on third posterior 800. 



Third posterior on wing-margin 608. 



Fourth posterior on second basal 208. 



Anal cell on fourth posterior 1600. 



Anal on wing-margin 208. 



Miocene shales of Florissant (Geo. W. Wilson). 

 Holotype.— Cat. No. 61991, U.S.N.M. 



• Bull. Amer. Mus. Nat. Hist., vol. 3.3. 



