341 



the posterior margin than on the other segments, the bristles of almost 

 an equal size, otherwise as preceding segments; eighth segment with- 

 out dorsal thorns, only the long hairs present on lateral region ; apical 

 segment as in Figure 14, Plate LXXXI ; ventral segments each with a 

 transverse row of long rather irregular hairs near the posterior mar- 

 gin except in the case of the eighth, which has the series on the trans- 

 verse median line. 



This description is taken from a specimen obtained by the writer 

 on the bank of the Sangamon River near White Heath, May, 19 15. 

 It was found in rather sandy soil at a depth of about 6 inches. The 

 specimen which emerged is a male. The imagines were remarkably 

 common in the forestry belonging to the University of Illinois, at 

 Urbana, on June 20, 191 5. The larva, which is predaceous, was not 

 obtained. The species is common and generally distributed through- 

 out the state, being probably our commonest species of the genus. 



CYRTID^ 



Unfortunately I have of this family but a single pupal exuvium of 

 one species, and that is in rather poor condition. It proves, however, 

 to be cpite different structurally from exuvia in the preceding group, 

 having neither strong hairs nor thorns on any part of head, thorax, or 

 abdomen, thus differing markedly from those herein described and 

 from the Tahanidcr, the latter having armature on the abdomen very 

 similar to the asilid group. 



It is unfortunate that in the case of the only reared specimen avail- 

 able here no record is given of the circumstances under which the pupa 

 was obtained. Species of allied genera have been found to be parasitic 

 in spiders, or to feed upon their eggs. Mr. J. L. King has obtained the 

 larva and pupa of a species of Pterodontia in Ohio. The pupa differs 

 from that of Oncodcs in possessing only 3 pairs of raised abdominal 

 spiracles. 



Oncodes costatus Loew 



Oncodes costatus Loew, Berl. Ent. Zeitschr., 1869, p. 165. 



Pupa. — Length, 5 mm. White, shining. Head smjdl. without dis- 

 coverable prt^tuberances or hairs (poorly preserved). Thorax with a 

 wartlike protuberance on each side of disc anteriorly, indicating the 

 location of the openings of the prothoracic respiratory organs. Abdo- 

 men with a wartlike protuberance on spiracular areas of segments i to 

 4, segment 5 without protuberance, the spiracle distinguishable, re- 

 maining segments without distinct spiracle ; apex of abdomen blunt, 

 last segment slightly protuberant but without armature of any kind, 



