1 68 UNIVERSITY or COLORADO STUDIES 



Panorpidce. 2 species, of different genera, one of which is extinct. 

 RaphidiidcB. 5 species, referred to the only two existing genera. 



Odonata (9 species) 

 jEschnid(Z. 3 species, referred to .(Eschna; one is a nymph. ^. separata is said 

 to belong to the subgenus Basiceschna; this group is now recognized as a 

 genus, so the species will be Basiceschna separata. 

 Agrionid<B. 6 species, one a nymph. Three genera are recognized, of which one 

 is extinct. 



Platyptera (6 species) 

 TermitidcB. 6 species, in 3 genera, one extinct. 



Trichoptera (22 species) 

 Hydrops ychida. 16 species, in 7 genera, of which 5 (one of them containing 7 



species) are extinct. 

 LeptoceridcB. 2 species, provisionally placed in the modern genus Setodes. 

 LimnophilidiB. One species, provisionally referred to the existing genus Limnophilus. 

 Phryganidce. 3 species, of as many genera, one of which is extinct. 



Thysanura (i species) 

 LepismatidcB. One species, of the recent genus Lepisma. 



Ballostoma (i species) 

 PlanocephalidcB. Including Planocephalus aselloides Scudder, a problematical 

 animal of uncertain affinities. Scudder makes the Ballostoma a suborder 

 of Thysanura. 



ARACHNIDA 



ARANEiE (spiders) (30 species) 

 In the nature of things, it is difficult to classify fossil spiders. Many years ago, 

 Mr. R. I. Pocock expressed to me his dissent from some of the references to genera, 

 etc., made by Scudder; but not being at that time especially interested in the Flo- 

 rissant fossils, I did not learn what changes he would make. 

 AgalenidcB. Two species, referred to a modern genus. 

 AttidiB. 3 species, placed in the extinct genus Parattus Scudd. 

 Drassidce. 5 species, placed in two modern genera. 

 Dysderid<B. i species, of a modem genus (Segestria). 

 Epeiridce. 12 species, in 4 genera, one genus (with 4 species) being extinct. 



There is one species of Nephila. 

 Theridiidce. 3 species, and egg-cases referred to a fourth. No extinct genera. 

 ThomisidcB. 3 species, referred to Thomisus in a broad sense. 



