T. D. A. Cockerell — Descriptions of Tertiary Insects. 385 



fifths of the wing above, and three-fifths below them ; media 

 represented by a straight rather weak vein in the lower field ; 

 cross-nervures oblique, their more distal ends on the margin. 

 The type consists of a pair of wings ; another specimen 

 (Station 13 B, Miss Gertrude Darling) shows the thorax and 



Fig. 9. 



Fig. 9. Eobanksia bittaciformis Ckll. 



A. Diagram of wing of type. 



B. Branching of radial sector in another specimen. 



abdomen ; the head is missing. The thorax is about 6 mm long, 

 the abdomen about 13, the latter curved, and apparently formed 

 exactly as in Bittacus, although no details can be seen. When 

 the wings are folded backwards, the costa is downward. 



Hah. — Miocene shales of Florissant, Colorado. A cotype in 

 Yale Museum. This remarkable insect seems to form a new 

 family (Eobanksiidse) of Mecaptera. The anterior wing is 

 very like that of the Panorpids in many respects ; the hind 

 wing closely resembles that of the Nemopteridge, though not 

 so elongated, and without an apical expansion. (Some Nemop- 

 teridee have no expansion.) Mr. JS". Banks, to whom I sent a 

 sketch of the venation, agrees that there is a distinct approxi- 

 mation to Nernoptera. Formerly it used to be maintained that 

 the Panorpids (Mecaptera) and Nemopterids were allied ; the 

 insect now described appears to lend support to this opinion. 

 The genus is dedicated to Mr. !N". Banks, in recognition of his 

 labors on the JNeuroptera. 



Trichoptera from Florissant. 



Phenacopsyche vexans gen. et sp. no v. 



Anterior wing. — Length about 19 mm (16-J visible, the base 

 hidden), outer margin about 10 mm , lower margin about 14. 

 Costa with basal half straight, apical slightly arched ; apex 

 obtuse, outer margin regularly convex. Wing brownish, from 

 a rather dense scaling or pubescence, the apical part of the 

 costal region and the broad (3 ram ) outer margin darker than the 

 rest (possibly less denuded) ; veins dark brown. 



