INSECTS FROM MIOCENE OF FLORISSANT, COLORADO 721 



nent, and there is little or no hair; abdomen thick, about 5 mm. 



long, with thin but conspicuous pubescence, the hairs quite long, 



and (as in P. sulphur ea) 



especially abundant at end 



of sixth segment; legs long 



and slender, hind legs about 



8 mm. long. 



Wings hyaline, the costa 

 darkened; two submarginal 

 and four posterior cells; 

 anal cell closed at or 

 almost at margin; second t.^„ ,,.' ,,. ,. 



. riG 6. — Frotophtmrta pal pahs, ends of 



submarginal cell little ex- basal cells. 



panded apically, and not 



angled above near base; second vein not turned backward at end; 



first posterior cell widely open. 



The following measurements are in microns: 



Second basal cell on discal, about 360 



Second basal cell on fourth posterior. 224 



Separation of second and third veins to anterior cross- vein. .... 1,200 



Basal corner of discal cell to anterior cross- vein 880 



Anterior cross- vein to base of second submarginal cell 1,840 



Lower side of second submarginal cell, about 1,680 



Transverse (vertical) diameter of second submarginal a little 



beyond middle 560 



Miocene shales of Florissant, Wilson Ranch (Wickham). 

 Among the Florissant fossils this comes nearest to Lithocosmus , but 

 the form of the second submarginal and first posterior cells is quite 

 different. The venation is essentially that of Phthiria and Acreo- 

 trichus, while the characters of the head are rather those of Phthiria 

 than Acreotrichus, though differing from both. 



Alomatia n.g. (Bombyliidae) 



A genus of Lomatiinae with rather long and narrow abdomen; 

 antennae close together, stout, the basal joint very bristly, the apical 

 one elongate-fusiform, bare; wings with two submarginal and four 

 posterior cells; anal cell closed at margin of wing; anterior cross- 

 vein oblique, at about the end of first fourth of discal cell; end of 



