NO. II LARVAE OF THE ELATERID BEETLES — GLEN 1 69 



tral area, with 3 or 4 prominent, sharp "teeth" (to) on each lateral 

 margin, and with distance between pleural area and caudal notch 

 about one-fifth total length of segment, exclusive of urogomphi. 

 Nasale tridentate at tip. Subnasale with many fine teeth. Fronto- 

 clypeal area truncate posteriorly. Eyes large ; bordered by 2 prominent 

 unpaired setae. Two large unpaired lateroepicranial setae on each 

 gena. Gula short and narrow. One "sensory" appendix on second 

 segment of antenna. Mandible with prominent retinaculum, but with- 

 out other teeth or toothlike expansions. Without setae ventrally on 

 basal segment of labial palpus. Presternum of prothorax undivided. 

 Mesothorax and metathorax with definite impressions on medio- 

 tergites, and up to 7 (usually 3 or 4) spinelike setae on each epister- 

 num. Abdominal mediotergites (fig. ^3^ <^) with impressions reach- 

 ing mediodorsal suture on all or most of segments, and with small 

 fine punctures, but lacking transverse rugae. 



Henriksen (1911, p. 269, fig. 62) depicts the larva of L. linearis 

 with prominent rugae on the abdominal mediotergites. This condition 

 was not found on any of the material examined. 



PROVISIONAL KEY TO SPECIES OF LEPTUROIDES 



1. From Europe linearis (Linnaeus) 



From North America 2 



2. From eastern and central United States and Canada ; impressions usu- 



ally reaching middorsal suture on all abdominal mediotergites (fig. 



33, c) denticornis (Kirby) 



From Alaska ; impressions usually not reaching middorsal suture on first 

 and eighth abdominal segments fulvus (Motschulsky) (?) 



Material used in the study of the genus. — L. linearis (Linnaeus) : 

 Thirteen larvae were examined. These were from Denmark (7), 

 Germany (i), Finland (i), and England (4). None of the specimens 

 was known to be associated with reared material. Labeled larvae were 

 received from the U. S. National Museum and from the British 

 Museum of Natural History. These specimens undoubtedly were of 

 the same species and definitely were congeneric with reared larvae of 

 Lepturoides denticornis (Kirby). Therefore, it is believed that the 

 material was properly identified. 



L. denticornis (Kirby) : Eight examples of this species were stud- 

 ied, including the exuviae of two reared specimens. All specimens 

 were taken together from under the bark of an old fallen elm. W. J. 

 Brown, of Ottawa, identified the reared adults. 



8; Carter County, Minn.; Apr. 8, 1933; 2 reared to adults on May 4, 1933; 

 R. Glen. (C.N.C.) 



