NO. 2119. BRITISH F088IL INSECTS— COCKERELL. 495 



genus. Wings clear, with brown veins, whicii are (so far as visible) 

 as usual in the genus. The discal crossvein is oblique, its upper 

 end more basad, rather in the fashion of ChrysocMora; its length is 

 about 160 ix. The discal cell is hexagonal, with three veins entering 

 it and three leaving it; the following measurements are in /x: Length 

 of discal cell, 670 ; width (depth) of cell, 432 ; face on third posterior 

 cell, 304; face on fourth posterior, 320. (In the living S. potamida 

 and S. furcata the face or side bordering third posterior is distinctly 

 longer than that on fourth.) Length of wing about 8 mm., but the 

 exact length is uncertain, the apex being invisible. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7507. Other 

 specimens, with the same history, and labeled 7510, 7520, 7586, 7505. 

 This is the oldest known Stratiomys; it shows that the color pattern 

 has come down practically unchanged from the Lower Oligocene. 



Holotype.—C&t. No. 61443, U.S.N.M. 



EPHYDRA OLIGOCENA, new species (Ephydridae). 



Wing about 3 mm. long; costa and second vein dark brown and 

 thick, the other veins pallid; costa with minute black bristles, not 

 larger above the costal cell than elsewhere; costa slightly interrupted 

 at end of costal cell ; costal cell narrow, its depth only 96 /x, the first 

 vein curved, not at all bent; second vein with a slight upward curve, 

 but perfectly straight at end; second basal cell confluent with discal; 

 anterior crossvein 432 /x from base and 624 from upper apical corner 

 of discal (plus second basal) cell; end of discal cell oblique, 192 n from 

 corner to corner; a short distance beyond the end of discal cell a 

 vertical line run upward across the wing will find the first posterior 

 cell 288 M deep, the submarginal 240, and the marginal 144; the sides 

 of the first posterior are here almost exactly parallel, but those of 

 the second posterior rapidly diverge. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7509. Larger than 

 E. sepulta, with end of discal cell conspicuously oblique, the lower 

 corner more apicad. Aldrich ^ has figured the venation of several 

 species of EpJiydra from photographs. In E. Mans Say the end of 

 discal cell is very obhque, with the lower corner more basad, exactly 

 reversing the condition in E. oligocena. In E. millhrae Jones it is less 

 oblique; but in E. gracilis Packard it is somewhat oblique, with the 

 lower corner more apicad, approaching the condition of E. oligocena. 



Holotypc— Cat. No. 61444, U.S.N.M. 



EPHYDRA (sous, lat.) SEPULTA, new species (Ephydridae). 



Plate 63, fig. 2. 



Wing about 2.5 mm. long, hyaline, with pale brown veins, costa 

 with numerous short intensely black bristles or spmules ; anal margin 



I Joum. New York Ent. Soc, vol. 20, 1912, pis. 7, 9. 



