THE LAMELLICOEN BEETLES. 1001 



Crawford and Perry counties; rare. JMay 10-May 16. The 

 larv£e of this species are said to live on the trunks and roots of the 

 chestnut, whence the specific name. As these trees grow indigen- 

 ously only in the southern third of the State, it is probable that the 

 beetle will be found to be confined to that area. Both it and canali- 

 culatus often have a small transverse hoary white spot formed of 

 exuded matter near the margin and just behind the middle of the 

 elytra. Casinn<<v is shorter and has the upper surface more dis- 

 tinctly pubescent with short erect yellowish hairs than in either the 

 preceding or the next species. 



1864 (5932). Ckemastochilus haekisii Kirby, Zool. Jourii., Ill, 152. 

 Elongate-oblong. Piceous, rather strongly shining. Mentum plate deeply 



concave, margins reflexed, more strongly at the sides and behind, its hind 

 margin broadly and deeply notched. Thorax more than one-half wider than 

 long, sides feebly curved; front angles short, obtuse, limited within by a 

 deep impression and behind l)y a finely impressed line: hind angles some- 

 what triangular, smooth, separated from the disk by a rather deep impres- 

 sion ; disk very sparsely and irregularly punctured and with distinct patches 

 of stiff hairs near the hind angles. Elytra very coarsely, deeply and densely 

 punctured. Length 10-11 mm. 



Lake, Starke and Vigo counties; scarce. April ^l-October 6. 

 Occurs usually in nests of large reddish ant.s in sandy localities. 

 Readily known by its more shining surface, more coarsely and 

 roughly sculptured elytra and larger tufts of hairs near hind angles 

 of thorax. 



XXXIX. OsMODERMA Lep. 1825. (Gr., "odor -f skin.") 



Large, broad, dark brown species, having the thorax distinctly 

 narrower than elytra; and rounded on the sides; last spiracle nearer 

 the front than hind margin of the segment. Two of the three 

 known species occur in Indiana. 



1865 (59.33). Osmodebma ehemicoiji Kuoeh., Neue Beitr., 1801, 105. 

 Broadly oval, depressed abo-^'e. Dark chestnut or ma- 

 hogany brown, shining. Head deeply excavated between 

 the eyes in both sexes, the edge with a tubercle above the 

 base of antennfe. Thorax \\'ith a deep impressed median 

 line on basal half, in front of which is a broad, deep ex- 

 cavation, bordered in front by a sharp elevated line. Sur- 

 face of both thorax and elytra very finely and sparsely 

 [junctate. Length 2.''i-20 mm. (Fig. 419.) 



Taken only in the southern half of State, but 

 probably occurs throughout; scarce. July 4-Au- 

 gust 12. Found at electric light and about the 

 borders of open woods.. Both it and the next emit, ^'^VAteHarrio'^'^' 

 when captured, a strong odor of russia leather. 



