OF WASHINGTON, VOLUME XV, 1913. 31 



genitalia with 2 lateral, curved, chitenous hooks, pointing anteriorally. 

 Dorsal carina running the whole length of the body, becoming more dis- 

 tinct toward the end of the abdomen. Antennae lying ventrally, over- 

 lapping the elytra. Head bent ventrally at right angles to prothorax. 

 First pair of legs lying between other pairs. 



EXPLANATION OF PLATE I 



CUPES CONCOLOR WESTW. 



Fig. 1. Larva (23.5 mm.), (a) ventral view, (b) lateral, (c) dorsal, 

 (d) mouth parts, ventral view, (e) anal segment, ventral view. 



Fig. 2. Pupa (11.5 mm.). Note last two joints of the left antennae 

 of pupa figured are deformed, (a) lateral view, (b) ventral view. 



Fig. 3. Adult 



Photographs by H. S. Barber. Drawings by C. T. Greene. 



OBSERVATIONS ON THE LIFE HISTORY OF MIGROMALTHUS 



DEBILIS LEG. 



(Goleoptera.) 



BY HERBERT S. BARBER, 

 (Bureau of Entomology.) 



In February, 1911, Mr. T. E. Snyder of the Bureau of Ento- 

 mology, brought me for determination, some minute larvse he had 

 found in the buried end of a chestnut telegraph pole in this city. 

 They were utterly strange to me but by chance the almost for- 

 gotten plate (here reproduced) of Micromalthus by the late Mr. 

 H. G. Hubbard, 1 the first figures published by him, came to mind 

 and the details there shown agreed so exactly with the fresh 

 larvae, that the determination was considered positive. 



The history of our knowledge of this beetle is interesting. In 

 August 1874, Messrs. Hubbard and Schwarz found a colony of 

 larvae, pupse and teneral imagoes in a red-rotten oak log near Detroit, 

 Michigan. They sent specimens to Dr. LeConte, whose descrip- 

 tion of the new genus and species, placed tentatively in the Ly- 

 mexylidse, appeared in their "Coleoptera of Michigan" 1 with 

 Hubbard's description and plate of figures appended at LeConte's 

 request. Its assignment to the Lymexylidse was decided upon 

 after correspondence between LeConte and Hubbard, the latter 

 having found some points of similarity in the larvse of Hylocattus. 



1 Proc. Amer. Philos. Soc., xvn, 1878, pp. 666-668 pi. xv. 



2 1. c., p. in::. 



