54 T. D. A. Cocl.erell — Descriptions of Tertiary Insects. 



Antennae with about 16 joints, the middle joints much broader 

 than long (about 102 /jl broad, and 76 long) ; scntellar region 

 with two very long stout bristles, 459 \x long, the other bristles 

 of thorax much shorter ; thorax very strongly convex above ; 

 legs and abdomen with extremely fine hairs ; hind tibia3 with 

 a row of short black bristles, about 93 /jl long. Yenation : sub- 

 costa reaching to about the middle of the wing, that is to say, 

 not abbreviated, and ending in a very broad Y, the upper 

 branch extending to the costa, and the lower to the radius ; 

 radius normal, its lower branch leaving it a short distance 

 before the termination of the subcosta, and emitting, shortly 

 after that termination, the oblique cross-vein to R a which 

 really represents R 2+3 ; R 4+5 normal, ending very near apex of 

 wing ; oblique radio-medial cross-nervure very long, about 

 three times as long as the nearly vertical first section of lower 

 branch of radius ; media with a long fork ; cubitus not dis- 

 tinctly preserved (it ought to be forked). 



Hab. — A few miles north of Rifle, Colorado, in rocks of 

 Eocene age, probably of the Green River Group, but possibly 

 Wasatch. Type in collection of Dr. S. M. Bradbury. This 

 cannot be identified with any of Scudder's fossil Mycetophi- 

 lidee. Professor O. A. Johannsen very kindly examined my 

 sketch and notes, and suggested the generic reference. He 

 writes as follows : 



" The subcosta in most of the species thus far described is 

 short, and ends either free, or in R ; in one species described 

 by Walker it ends in the costa ; in one species of Meunier it is 

 long, though ending in R. As only about sixteen species 

 (including fossils) are known of this genus, and these quite 

 rare, its limitations are difficult to define. I should be inclined 

 to call your fossil Tetragoneura, though acknowledging it as 

 somewhat aberrant" (litt. Aug. 19, 1908). The known fossil 

 species of Tetragoneura number seven, all from Baltic amber, 

 described by Meunier. As the amber is of Oligocene age, the 

 species now described is the oldest known. 



Alepidophora g. nov. (Bombyliidse). 



A genus with elongate, subcylindrical abdomen, looking not 

 unlike a bee. In Williston's tables (N. Am. Dipt., 3d ed., p. 216) 

 it runs to 29, and has very much the build of Zepidophora 

 lepidocera (appendiculata), except that it is not at all scaly, the 

 wings are very much shorter, and so far as can be seen, the 

 mouth-parts are not elongated. The anterior tibiae (the only 

 ones visible) are not bristly, as they are in Sphenoidoptera. In 

 the hairy abdomen it differs from Paracosrmis / but the course 

 of the second vein is as in Paracosmus, not as in Metacosmus. 



