1919] Deltometopus Rufipes Melts 53 



arrangement. A portion of the seventh segment is elevated and 

 extends as a flap over a portion of the eighth when the body is 

 curved. The elevated portion containing the anal opening is 

 probably the tenth segment. Figs. 12 and 13 show a female 

 pupa. The arrangement of the caudal segments is somewhat 

 different in the male as shown in Fig. 14. The length of the 

 female averages 8 mm., the male 6 mm. The color is white 

 until the color of the developing beetle begins to show when it 

 appears to be a dull brown. 



This species apparently takes three years to mature, as 

 larvae of three different sizes have been taken in the same log 

 in autumn. The larvas are certainly able to bore into wood. 

 They seem to use the serrate margin of the head to assist 

 progress and probably hold themselves firmly in a partially- 

 formed burrow by the lateral protuberances on the segments, 

 especially the strongly chitinized one on the prothorax. The 

 burrows are very small and not easily detected, but some of the 

 wood where they were found did not need much boring as the 

 larvae could almost push their way along. As to their food, I 

 cannot state positively, but they have always refused any 

 insect larvae placed in the cages, and have lived for at least 

 eight consecutive months on nothing but wood. In the case 

 of larvae feeding in very firm wood there never seems to be any 

 "sawdust" or frass about, but very frequently a clear liquid is 

 seen to be expelled from the anus. Even such facts as have 

 been discovered about the mouth-parts will not entirely solve 

 the problem. 



Literature Cited. 



Coquerel, C. Annals de la Soc. Entom. Vol. IV, 3e Serie. 

 Horn, G. H. Proc. Ent. Soc. Phil. 1 : 43. 

 Mclndoo, N, E. Joum. of Morphology, 31 : 113-132. 

 Osten Sacken, C. R. Proc. Ent. Soc. Phil. 1 : 112-115. 



Schiodte, J. C. Naturhistorisk Tidsskrift, Ser. 3, Vol. 3. (translation, Ann. and 

 Mag. Nat. Hist., Ser. 3 : 173-212.) 



