44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



A detailed description of the mature larva of L. aeripennis de- 

 structor Brown is given on pages 19-29. A general description was 

 published by the writer in 1935 and prior to that the larva was figured 

 by Strickland (1926, p. 7, fig. i). 



Material used in study. — Sixteen examples of the typical aeripennis 

 and 36 of the subspecies destructor were examined. This material 

 included the cast skins of 7 reared specimens of the typical form and 

 6 of destructor. Reared adults were all identified by W. J. Brown, 

 Ottawa, Ontario. 



L. aeripennis aeripennis (Kirby) : To avoid misidentification, at 

 least one specimen was reared to the adult state from each of the four 

 groups of material selected for use in the present study. 



4; Stump Lake, Saskatchewan; A^ay 20, 1935; 2 reared adults emerged May i, 



1936, and July 4, 1936; B. Rysstad. (C.N.C.) 

 5; Dawson Creek, British Columbia; July 1935; a reared adult emerged June 2, 



1936; K. M. King. (C.N.C.) 

 5; Tacoma, Wash.; Sept. 26, 1934; 2 reared; M. W. Stone. (C.N.C.) 

 2; Kirkland, Wash.; Aug. 30, 1933; 2 reared; E. W. Jones. (U.S.N.M.) 



L. aeripennis destructor Brown : During the past 10 years large 

 numbers of larvae of this species have been examined. However, in 

 the present study careful examination was limited to approximately 

 36 specimens. These were from Saskatchewan (26) and Alberta 

 (10). Twenty-seven specimens were collected from areas where the 

 typical aeripennis has never been found. The other 9 were from the 

 Peace River area of Alberta, but identification was confirmed by rear- 

 ing. All this material is in the Canadian national collection. Separate 

 collections for which associated reared adults are available are listed 

 below. 



20; Swift Current, Saskatchewan; June 1935; 4 reared adults emerged Aug. 27, 

 1935, May 4, 1936, and 2 on May 21, 1936; R. Glen and V. L. Berg. 



4; Beaverlodge, Alberta; July I935; i reared adult emerged Aug. 17, 1935; 

 K. M. King. 



5; Clairmont, Alberta; July 1935; i reared to adult Mar. 30, 1936; K. M. King. 



LUDIUS APPROPINQUANS (Randall) (?) 



Elater appropinquans Randall, Boston Journ. Nat. Hist., vol. 2, p. 5, 1838. 

 Luditis appropinquans (Randall), Brown, Canadian Ent., vol. 67, pp. 130-131, 

 1935. 



According to Brown (1935b, p. 131) this eastern North American 

 species is distributed from central Manitoba and Wisconsin to the 

 Atlantic coast. It is a forest species, occurring in the decomposing 

 litter and under the bark of decayed coniferous logs and stumps. 



