238 



This species closely resembles Genus incertus i of this paper in 

 head-structure and appearance, differing however in the absence of 

 pseudopods. It undoubtedly belongs to the Eriopterinae. 



Papers on the Biology of North American Limnobiidae* 



Cylindro tominae 

 Alexander, C. P. 



'14. Biology of the North American crane flies (Tipulidae, Dip- 

 tera). IL Pomona Coll, Jour. Ent. and Zool., 6:105. (Con- 

 tains full bibliography of the immature stages of the group.) 



Osten Sacken, C. R. 



'69. Monographs of North American Diptera. Part IV, p. 296. 

 (Contains synopses of genera and species of imagines.) 



LimnopJiilinae 



Alexander, C. P. 



'15. The biology of the North American crane flies (Tipulidae, Dip- 

 tera). III. The genus Ula Haliday. Pomona Coll. Jour. Ent. 

 and Zool., 7:1. 



Hexatominae 

 Alexander, C. P. 



'14. The biology of the North American crane flies (Tipulidae, Dip- 

 tera). I. The genus Eriocera Macquart. Pomona Jour. Ent. 

 and Zool., 6 : 12. 

 '15. The biology of the North American crane flies. IV. Tribe 

 Hexatomini. Pomona Jour. Ent. and Zool., 7 : 141. 



Family PTYCHOPTBRWAB 



FAMILY CHARACTERS 



I^arva.—YiQ:2.<i complete; mandibles opposed. Body long and 

 slender, with well-developed pseudopods armed with spines or bristles ; 

 many of the hairs on head and body plumose ; larva metapneustic, the 

 tracheae extensile, in the form of a long slender membranous tube. 



Pupa. — Thoracic respiratory organs very unequal in length, one 

 many times as long as the other ; fore tarsi overlying mid pair. 



Imago. — Separable from Tipulidae and Limnobiidae by the ab- 

 sence of the seventh longitudinal wing-vein, and the rather poorly de- 

 fined mesonotal suture. 



*See also papers listed in the bibliography of Tipulidae. 



