102 THE CANADIAN ENTOMOLOGIST 



side of second submarginal basad of level of end of lower side, 400, 

 and width of cell at this point 530; width of second submarginal 

 640 from end of lower side, 432; width of first posterior cell at apex 

 640, of second at apex 320, of third at apex 1250; discal cell on first 

 posterior 960, on first basal 225; basal side of second posterior 160, 

 of third posterior 272; closed apex of fourth posterior to wing 

 margin about 240, of anal to wing margin apparently over 320, but 

 margin at this point not visible; width of anal at level of basal 

 corner of fifth posterior 480. Florissant; Station 13 (S. A . Rohwer.) 

 This genus has been referred by Osten-Sacken, Verrall and 

 others to the Stratiomyidae, but Williston places it in Leptidae. 

 The genera Arthropeas and Arthropiella, which Meunier places in a 

 distinct family, are apparently related; they occur in Baltic amber. 

 Verrall states that the larva of Xylomyia shows that it belongs 

 with the Stratiomyidae rather than with the Leptidae. On the 

 whole, it seems probable that Xylomyia, Glutops, Arthroceras, and 

 probably the two amber genera, should together form a distinct 

 family. 



Saropogon oblitescens, n. sp. (Asilidae). 

 Wing about 7^2 mm - long; fourth posterior and anal cells 

 closed; small cross-vein from base of second submarginal cell 1040 

 microns, but second submarginal cell over 1440 long (apex gone) ; 

 second submarginal cell, so far as visible, narrow, parallel-sided, 

 its width (depth) about 290 microns; small cross-vein 1230 microns 

 from base of discal cell, and 800 from its apex; separation of second 

 and third veins 1230 microns from origin of their common stem 

 from first; fourth posterior cell closed about 130 microns from 

 margin, anal the same distance, but apex of anal a much smaller 

 angle than apex of fourth posterior; apical sides of discal cell very 

 unequal, that on second posterior cell twice as long as that on 

 third; apical angle of discal cell very much greater than a right 

 angle. Wing clear, venation, dark brown. Compared with Saro- 

 pogon dispar, the fossil differs in having the fourth posterior and 

 anal cells closed well before the margin, and the second posterior 

 distinctly narrower, but otherwise the venation is about the same. 

 The venation is in general very like that of Selidopogon diadema, 

 but that has the second posterior cell more widely open, and the 

 subcostal cell larger. Florissant (University of Colorado Expedition). 



