20 Proceedings of the Biological Society of Washington. 



with very pale veins; venation normal for Glossina, except that the outer 

 margin of the discal cell is strongly curved above, becoming more or less 

 S-like, so that the end of the cell is narrowed ; this is an exaggeration of 

 the condition found in the fossil G. osborni Ckll. and the living G.fusca 

 Walker. 



Miocene shales of Florissant (Geo. Wilson). 



I at first thought this species should represent a distinct genus, on 

 account of the shape of the end of the discal cell and the strong armature 

 of the hind legs. I found, however, that the living G. fusca possessed 

 all these characters in a less exaggerated form, and that it would be im- 

 possible to define a genus satisfactorily. It then appeared possible that 

 the specimen might be referred to the fossil G. osborni, but in that 

 species the outer side of the discal cell, if the bulge at the upper end is 

 not considered, is nearly at right angles to the upper side, whereas in 

 G. armatipes the outer side, ignoring the bulge, is oblique, at an angle 

 of about 45° with the upper side. G. osborni is a typical Glossina, 

 whereas G. armatipes is a distinctly aberrant species. The fossil species 

 of Glossina known from Florissant may be separated thus: 



Very large, wings 16 mm. long; outer side of discal cell hardly curved, 

 and anterior basal cell strongly claviform at end . oligocena (Scudder). 



Wings 10.9 mm. long; outer side of discal cell more oblique, and an- 

 terior basal cell hardly claviform at end veterna Ckll. 



Wings less than 8 mm. long 



osborni Ckll. and armatipes Ckll. (differing as indicated above). 



Dolichomyia tertiaria new species (Bombyliida?). 



Length 10 mm.; thorax 2.25 mm. long; wings 5 mm. long, perfectly 

 clear; hind legs long and slender, femora 3.5 mm., tibia 3 mm.; abdo- 

 men very long and slender, not noticeably enlarged apically, its depth a 

 little over 1 mm. Head, thorax and legs dark, abdomen dark with 

 broadly hyaline sutures. Venation exactly like Dolichomyia, as figured 

 by Williston, but some of the apical nervures obliterated or almost so, 

 being very pale and thin. The following measurements are in microns: 

 praefurca about 160, first basal cell on first submarginal 1090, first basal 

 on discal 850, first posterior on discal 560, second basal on discal 144, 

 second basal on third posterior 240. 



Miocene shales of Florissant (Geo. Wilson). 



The discovery of a Dolichomyia in the Miocene is surprising ; the genus 

 is to-day represented by scattered and rare species in South and North 

 America (Colorado). 



Oxycera (?) contusa new species (Stratiomyidae). 



Female. — Length 6.3 mm. ; head, thorax and abdomen dark, the ab- 

 domen without markings; thorax 2.6 mm. wide; abdomen very broad, 

 circular, the breadth and length 3.3 mm. ; eyes naked, .5 mm. apart on 

 vertex; wings 5.6 mm. long, perfectly clear, the veins very faint. The 

 venation appears to be normal for Oxycera, but most of it is so faint that 



