A. A. GIRAULT. 57 



females in having a plump ovate abdomen, blunt caudad, 

 whereas in the other sex it is conic-ovate, obliquely truncate 

 beneath caudad and hence pointed ; the antennal structures 

 are the same in both sexes but in the female the terminal 

 club joint ends in two more or less prominent spines which 

 are less conspicuous in the male ; and colorationally, the 

 females differ in having the three transverse black bands of 

 the abdomen subobsolete, inconspicuous, if not absent, con- 

 trasting in this respect with the male. The genitalia of the 

 male are not exserted in death. In the original description 

 of this species, therefore, all that is given applies to the 

 male which was mistaken for the female. It applies as well 

 to the female with the exceptions noted. I have examined 

 18 specimens altogether, the four males and one female of 

 the type, the three females and six males of the original 

 specimens from which Ashmead named the species (Web- 

 ster's No. 1895'') and four female specimens taken on win- 

 dows. These latter specimens were taken at Centralia, Illi- 

 nois August 27 and September 6, 1909 and at Urbana, Illinois, 

 a single female taken from the glass sides of a greenhouse 

 April 30, 1910. The two lateral, outer teeth of the mandibles 

 are strong, fuscous, the third tooth weak, pallid. 



In regard to the Webster number of this species. No. 1895"^, 

 Professor F. M. Webster in a letter dated March 12, 1910 

 wrote : 



"No. 1895 was reared from Elyinus canadensis growing along the 

 Illinois Central Railroad, north of Champaign. This Elyvms grows 

 quite abundantly on the west side of the track at the second crossing 

 north of town. I think that the specimens that Robert reared and 

 turned over to you about a year ago, came from this same locality, only 

 of course at a later date." 



The following additional notes are added concerning the 

 female : 



The abdomen is stout and conic-ovate, slightly longer than the head 

 and thorax combined ; eyes ovate-reniform ; the few discal cilia of the 

 fore wing proximad of the stigmal vein, caudad of the marginal vein 

 consists of two short inconspicuous longitudinal lines of about three 

 minute cilia each, and another line disto-cephalad of the others or 



TRANS. AM. ENT. SOC, XXXVII. (8) 



