224 



4-6 smaller protuberances which, like the others, are armed at apices 

 with 1-2 weak hairs; lateral margins with a tubercle at a point cor- 

 responding to the situation of the dorsal and ventral transverse series ; 

 apical segment of male and female as in Figures 8 and g, Plate 

 XXXIII. 



I collected a large number of pupae of both sexes of this species 

 on the banks of the Sangamon River at White Heath, 111., May 28, 

 191 6. I found that by taking mud from the bank and disintegrating 

 it in the water I could readily obtain the pupae as they floated at the 

 surface. The species is common in Illinois, and probably occurs in 

 most of its streams. The pupa was described by Mr. Hart as Lim- 

 nophila species (a) in his paper previously referred to. 



Epiphragma Osten Sacken 



I have not seen the early stages of this genus, but those of fasci- 

 pennis have been described by Needham, as indicated in the synonymy 

 under the species name. 



GENERIC CHARACTERS 



Larva. — Details of the cephalic structure are lacking in Needham's 

 description, and as I have no means of ascertaining these, only the 

 superficial characters can be indicated. Body cylindrical, without sur- 

 face hairs or bristles; ventral pseudopods represented by fusiform 

 ventral areas ; apical abdominal segment with 4 short marginal 

 processes and 4 slender protrusive ventral blood-gills. 



Pupa. — Thoracic respiratory organs much shorter than in Lim- 

 nopliila and Ula, and more horn-like than tube-like, their apices in- 

 curved and acute. Legs extending beyond apices of wings the length 

 of 2 abdominal segments, terminating in an almost straight transverse 

 line. Abdomen without thorn-like armature, only bristly hairs present 

 at apices of segments. 



Epiphragma fascipennis Say 



Limnobia fascipennis Say, Jour. Acad. Nat. Sci. Phila., Yol. 3, p. 19. Imago. 



(1S23) 

 Epiphragma pavonia Osten Sacken, Proc. Acad. Nat. Sci. Phila., 1859, p. 239. 



Imago. 

 Epiphragma fascipennis Say, Osten Sacken, Mon. N. Am. Dipt., Vol. 4, p. 194. 



Imago. (1869) 

 Epiphragma, fascipennis Say, Needham. Bull. 68, N. Y. State Mus., p. 281. 



Larva and pupa. (1903) 



