62 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



total length of segment (exclusive of urogomphi). Pleural area large, 

 consisting of transversely striated membrane except for small ovate 

 pleurite at anterior ends. Sternum of 2 sclerites, separated anteriorly 

 by median longitudinal suture and posteriorly by tenth abdominal 

 segment; each sclerite usually with from 10 to 15 setae, mostly in row 

 around tenth abdominal segment. 



Urogomphi {ur, fig. 16, /; fig. 16, d), separate, bifid, short, robust; 

 prongs subequal, dark and horny, resembling grappling hooks. Inner 

 prong (ipr) directed mediocaudad in horizontal plane, with sharp, 

 horny point turning upward; small horny tubercle on caudolateral 

 surface ; usually 3 or 4 long setae and as many smaller setae arising 

 from outer surface of prong; sometimes a few fine setae on inner 

 aspect. Outer prong (opr) projected dorsad or caudodorsad and 

 usually slightly mesad with long, sharp, horny point curving back- 

 ward and usually slightly inward and downward ; small tubercle later- 

 ally just at base of prong; 2 or 3 large setae, i issuing from anterior 

 or anterolateral aspect, almost halfway up prong, i or 2 from base 

 of turbercle; up to 10 smaller setae scattered over prong. Undivided 

 part of urogomphus very short ; thick ; usually with a few fine short 

 setae scattered over mesal, ventral, and lateral surfaces. 



Caudal notch (en) large, U-shaped or transversely subovate, wider 

 than long, somewhat narrowed posteriorly by tips of inner prongs. 



Tenth abdominal segment with a proximal whorl of about 20 fine 

 setae and a distal whorl of 10 such hairs; anal aperture linear and 

 median. 



Material used in study. — Twelve specimens were examined. All 

 were collected at Saskatoon, Saskatchewan, from native sod and cul- 

 tivated fields. The species has not been reared and identification is 

 based upon field association of adults and larvae and upon other 

 evidence presented in the introductory paragraphs of the discussion 

 of this species. (Canadian national collection.) 



LUDIUS CRUCIATUS FESTIVUS (LeConte) (?) 

 Figure 16, c 



Corymbites festivus LeConte, Reports of explorations and surveys . . . from 

 the Mississippi River to the Pacific Ocean, vol. 12, pt. 3, No. i, p. 46, 1857. 



Ludiits cniciatus festiznis (LeConte), Brown, Canadian Ent., vol. 67, p. 3, 

 1935. 



Unidentified larvae, obviously closely allied to sexualis Brown, were 

 found in soil at Stump Lake in northern Saskatchewan. This collec- 

 tion was made in 1934 in a field which reportedly had been part of a 

 spruce forest until 1926. These larvae were found together with 



