THE CANADIAN ENTOMOLOGIST 229 



SOME FOSSIL INSECTS FROM FLORISSANT, COLORADO. 



BY T. D. A. COCKERELL, UNIVERSITY OF COLORADO, BOULDER, COL. 



The insects now described have a very modern aspect. The 

 anal cell of Venallites, taken by itself, may be thought of as primi- 

 tive, but the fly is otherwise a specialized type. Certainly there 

 has been little advance in insect evolution since the Miocene, but 

 many genera have become extinct. 



HOMOPTERA 



Echinaphis new genus (Aphididte) 

 Stout, with long antennae; the two basal joints short as usual; 

 the first somewhat gibbous at apex on inner side; front broad; 

 abdomen with six longitudinal rows (the outer was lateral) of about 

 six very strong black spines; the apex of abdomen, which is broad, 

 with a transverse (marginal) row of six still larger and stronger 

 spines; cornicles not evident, probably small; hind wing of rather 

 coriaceous texture, the venation essentially as in Chaitophorus. 

 Anterior wings not preserved in type. 



Echinaphis rohzueri, n. so. 



Length, 3 mm.; width of abdomen, L75 mm.; length of hind 



wing a little over 2 mm.; dark colored, with the anterior legs clear 



^, ferruginous; wings reddish; front and 



^ « sides of thorax without hairs. The 



■■# ' vw^ <J^ \\l\i\i Ai following measurements are in mi- 



»^'^^N\yF^^, # -' !«}'/* crons: Width of front between eyes 



"ii^ ^,^''\ .• >'  "'-vij'^^ 320; length of first antennal joint 128; 



/ ^ '^ \ \ \ ^^ second 80; antenna, from base of 



V U \ \ third joint to apex, 1665; length of a 



pj^ g dorsal spine about 160; of a caudal 



Er/,i:a/,/z,-s rokweri. ckii. oneabout270; distance between the 



wing- veins (Cu and M.) at base (separation from Rs) about 112. 



The veins are nearer together at base, and less parallel than in 



Chaitophorus populicola. 



Miocene shales of Florissant, Station 13 (5. A. Rohiver). 

 This singular species is quite unlike any of the fossil Aphids 

 previously described from Florissant. In the development of 

 spines, it has a certain resemblance to the living Chaitophorus 

 spinosHs Oestl., found on oak in Minnesota. Sipha glyceric 

 (Koch), which is also spiny, has much shorter antenna;. Close to 



July, 1913. 



