NO. 2119. BRITISH FOSSIL INSECTS— COCKERELL. 493 



Needham makes use of it in his key in Report of New York State 

 Entomologist for 1907, page 247. In Scudder's fossil species of 

 Rhamphidia from Florissant the branches of Rs run parallel, as in 

 Atarha picticornis. 



Holotype.—Csit. No. 61439, U.S.N.M. 



BIBIODITES, new genus (Bibionidae). 



Small flies with nearly the venation of Bibiodes,^ but the third vein 

 is confluent with the fourth for only a short distance. Legs long and 

 slender, but the anterior femora much thickened; thorax long, rather 

 flattened, scutellum small but prominent. The fourth vein branches 

 at the level of the stigma, as in Bihiodes halteralis Coquillett. 



Genotype.— Bihiodites conjluens, new species. 



BIBIODITES CONFLUENS, new species. 

 Plate 62, fig. 3. 



Length 5 mm. or a little over; wings clear, with large dark stigmatic 

 spot, which is about 3 mm. from base of wing; costa with minute 

 bristles; the strong veins, under a microscope, are seen to be trans- 

 versely barred, exactly as in modern Bihio; confluence of third and 

 fourth veins 160 fx, from point of separation to fork of fourth 1,040 n; 

 middle tibia about 1,200 ix long; measurements of hind leg in /x, tibia 

 1,840, first joint of tarsus 800, secojid joint 400, third 320, fourth 240 

 fifth 320. The apical part of the wing is missing, and the end of the 

 anterior tibia can not be seen. The venation below the fourth 

 vein is too obscure to make out. 



Ohgocene at Gurnet Bay (Brodie). Lacoe CoU. 7624. This might 

 be treated as a subgenus of Bihiodes, but it is less speciaHzed than the 

 modern flies, 9,nd may be better regarded as the type of an extinct 

 genus. The structure and appearance indicate that it belongs to the 

 Bibioninae, not to the Scatopsinae. At the same time, it is impossible 

 to demonstrate a second basal cell, the dehcate veins of this part 

 of the wing being wholly obliterated. 



Holotype.—C&t. No. 61440, U.S.N.M. 



PSYCHODA PRIMAEVA, new species (Psychodidae). 



Plate 62, fig. 5. 



Wing about 3 mm. long and 1 mm. broad, obtusely pointed, faintly 

 yellowish, without markings, veins pale; thorax dark brown. R^ 

 strongly curved upward before the middle of the wing, and then 

 nearly straight; i?2+3 with a stem 512 ju long between the upward 

 curve of R^ and the fork; R^ from its separation from R^ to margin 

 1,440 m; fork of media about 1,200 /x from base of wing; il/3, from 

 fork to wing margin, 1,440 fx. The end of ^3 is 320 fx basad of level 



1 Melander, Bull. Amer. Mus. Nat. Hist., vol. 31, p. 339. 



