Vol. 30, pp. 19-22 February 21, 1917 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A FOSSIL TSETSE FLY AND OTHER DIPTERA FROM 

 FLORISSANT, COLORADO. 



BY T. D. A. COCKERELL. 



The Diptera described below were collected recently by Mr. 

 Geo. Wilson, and transmitted to me by Mr. F. H. Ward. 

 They have been placed in the U. S. National Museum. The 

 tsetse flies {Glossina) at present belong to the Ethiopian fauna. 



Glossina armatipes new species (Glossinidse). 



A specimen in lateral profile, the head and anterior part of thorax 

 missing. 



Male. — Length of wing about 7.5 mm., of abdomen about 6.5 mm.; 

 hind femur 4 mm., hind tibia 3 mm. Thorax black, sides not hairy; 

 the position of the bristles can not be made out, the pteropleural and 

 sternopleural bristles usually so conspicuous in Glossina can not be seen. 

 Abdomen in lateral view appearing rather slender, the apex curved 

 downward and forward, with a pair of clavate chitinous rods obscurely 

 indicated; hair of abdomen fine and thin, as usual in the genus; base of 

 abdomen broadly dark, beyond this four or five dark brown bands, the 

 first three very distinct, and separated by colorless intervals as wide as 

 themselves. Middle (?) tarsi with fine hairs and coarse black bristles, 

 as usual in the genus. Hind femora with a row of long black bristles on 

 lower side, beginning about 1440 m from end, these are eight in all, di- 

 rected downward, the last three short, but the fifth longest (about 560 m), 

 extending across the whole width of the adjacent flexed tibia. Tibia 

 with fine scattered hairs and a row of strong black bristles on outer face, 

 but I can not see any regular row of short spines such as occurs in modern 

 Glossina ; at the end of the tibia are two large curved spines, one larger 

 and much stouter than the other. Hind basitarsus very minutely hairy, 

 the anterior side near the base with two stout spines, which are very 

 finely longitudinally striated (the same occur in the living G. fusca 

 AValker); tarsi long; claws slender and simple. Wings perfectly clear, 



7— Proc. Biol. Soc. Wash., Vol. 30, 1917. (19) 



