136 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. Ill 



full grown. Caudal notch small, ovate. Urogomphi bifid; prongs 

 rather short, subequal in length and sharply pointed ; inner prong (ipr) 

 with a strongly sclerotized protuberant inner margin. Three small 

 rounded "teeth" on each lateral margin of dorsal plate of ninth ab- 

 dominal segment. Nasale (n, fig. 25, &) of i pointed tooth. Sub- 

 nasale (sn) with i large central tooth and numerous fine denticles 

 laterally. One "sensory" appendix on second segment of antenna. 

 Mandible short, robust; distal half with prominent expansion of 

 dorsal margin of inner surface. Gula short and relatively narrow. 

 Eyes present. Frontoclypeal region extending backward to foramen 

 magnum ; truncate posteriorly. Presternum divided into 4 sclerites. 

 Without spinelike setae (rarely with i seta) on episterna of meso- 

 thorax and metathorax. First 8 abdominal segments with short im- 

 pressions, transverse branches reaching one-fourth to one-third of dis- 

 tance from longitudinal branches to middorsal suture ; prominent setae 

 unpaired; pleurites very small (as in fig. 25, e) and usually difficult 

 to observe ; sternum undivided ; spiracles subequal in size and situated 

 in anterior half of each segment. 



Material used in study. — Three specimens, two larvae from New 

 Brunswick and the last larval exuvium of a reared specimen, were 

 examined. The reared adult was identified by W. J. Brown, of Ottawa. 



i; Cascapedia River, Quebec; Aug. 26, 1935; reared to adult; M. L. Prebble. 

 (C.N.C.) 



* * * 



LUDIUS RESPLENDENS AERARIUS (Randall) 



Figures ii, b, f; 13, b; 26 



Liidius resplendens Eschscholtz, in Thon's Entomologisches Archiv, vol. 2, 



p. 34, 1829. 

 Elater aerarius Randall, Boston Journ. Nat. Hist. vol. 2, p. 7, 1838. 

 Diacanthus racinei Chevrolat, Rev. Mag. Zool., p. 578, 1852. 

 Corymbites viridis Germar (nee Say), Zeitschr. fiir die Ent., vol. 4, p. 61, 1843. 

 Liidius resplendens aerarius (Randall), Brown, Canadian Ent., vol. 71, p. 45, 



1939- 



In addition to the typical resplendens. Brown (1939, p. 45) recog- 

 nizes two subspecies, breweri (Horn) and aerarius (Randall). Com- 

 bining the information given by Brown, Leng (1920, p. 169) and 

 Van Dyke (1932, p. 425), the distribution is as follows: the typical 

 resplendens is found along the mountains from Alaska to California ; 

 at its southern limits it is replaced by breweri and along the moun- 

 tains of western Alberta it intergrades with the eastern aerarius, 



