PAPERS OX ZOOLOGY 317 



blnnt tips. Mew ed dorsally it is seen that the breathing- 

 horns are not contiguous basally as in the genus EUiptera 

 but are inclined proxiniad so that the tips touch one an- 

 other, or nearly so; the dorsal margin is flattened and 

 provided with about a dozen separated beathing-pores. 

 Mesonotuni smooth and not at aU precipitous. Wing- 

 sheaths rather long, ending opposite the base of the 

 third abdominal segment. Leg-sheaths ending about op- 

 posite midlength of the fourth abdominal segment or 

 slightly beyond, the tarsal sheaths ending nearly on a 

 level or the two inner pairs a little longer than the outer 

 pair. 



Abdominal segments three to seven near the base are 

 provided "vrith two bands of chitinized hooks enclosing a 

 transverse area, these interrupted on the venter by the 

 leg-sheaths. There are about four or five distinct rows 

 of hooks in each of these bands, those of the anterior 

 band directed cephalad, those of the posterior band di- 

 rected caudad, the hooks on the outer margin of these 

 areas smallest, almost hair-like, the hooks increasing in 

 size toward the enclosed area. Male cauda (fig. 10) chit- 

 inized. the tergal region produced into a powerful curved 

 hook on either side, this bent strongly dorsad; in this 

 sex the sternal valves do not project caudad beyond the 

 level of tliis spine; in the female the sheaths of the ovi- 

 positor (fig. 11) project considerably beyond the spine 

 which is thus situated at about midlength of the tergal 

 valves. 



Xepionotype [ty^e larva). Alto Pass. XTnion County, 

 Elinois, Jime 6, 1919 (Alexander and MaUoch). 



Xeanoti/pe (type pupa), with the type larva. 



Paratypes, numerous larvae and cast pupal skins with 

 the types ; other material from the Campus of the Uni- 

 versity of Illinois, Champaign Coimty, summers of 1917 

 (Malloch) and 1919 (Alexander). 



