THE DEATH-WATCH AND DRV (I STOKE BEETLES. 



cc. Two outer joints of antennae normally separated; trout coxae con- 

 tiguous; hind coxal plates narrow and parallel ; rnesosternuni 

 strongly elevated into a central keel which is horizontal and at- 

 tains the level of the rneta sternum. Theca. 

 aa. Front coxae not expanded into apical plates, entirely shut in in repose; 

 trochanter joined to the apex of the coxa. 

 d. Front coxae contiguous or nearly so; head impressed or excavated be- 

 neath for the antennae. 

 e. Punctures of elytra confused, not in rows; metasternum not lohed 

 in front; epipleurse without small pits for the reception of hind 

 knees ; antennae 10- jointed. XIV. Catorama. 



ee, Punctures of elytra in tows ; metasternum apparently broadly lobed 

 in front, on account of deep and narrow excavations for middle 

 tarsi ; epipleurae with small pits for the hind knees ; antennae 9- 

 01* 11- jointed ; pubescence more or less bristly. XV. Protheca. 

 dd. Front coxae widely separated, antennae received between them. 



/. Prosternum produced behind into two long, slender, horn-like proc- 

 esses ; antennae 10-jointed ; form oval, moderately elongate. 



XVI. DORCATOMA. 



//. Prosternum truncate and emarginate behind ; antennae S-, 9- or 10- 

 jointed. 



g. Eyes minutely emarginate ; elytra without striae on the disk ; 

 form broadly oval. XVII. Eutylistus. 



<jg. Eyes deeply and acutely incised, the notch extending to or be- 

 yond the middle; form nearly globose. XVIII. Cenocara. 



XII. Petalium Lec. 1861, (Gr., "a leaf.") 



Small, parallel, more or less elongate, rather strongly convex 

 species, having the antenna 11 -jointed, about one-third the length 

 of body, joints 9 to 11 together as long or slightly longer than all 

 preceding ; thorax as wide as elytra and with a short curved, deeply 

 impressed line on sides behind the front angles; strongly excavated 

 beneath for the reception of the head : prosternum short, front 

 coxse widely separated; second ventral segment as long as the three 

 followdng united. 



KEY TO INDIANA SPECIES OF PET A LIU M. 



a. Punctures of elytral rows strong, close-set and distinct quite to apex, 

 the two lateral rows not much deeper than those on disk. 



1665. SERIATUM. 



aa. Punctures of elytral striae finer, less close-set and becoming nearly obso- 

 lete on apical third, the two lateral rows conspicuously deeper. 



1666. BISTRIATUM. 



16(35 ( ). Petalium seriatum Fall. Trans. Amer. Ent. Soc. XXXI, 



1905. 215. 



Moderately elongate. Brown, distinctly though sparsely pubescent. Head 

 and thorax densely punctate throughout ; the latter with disk a little promi- 

 nent, with well-defined oblique impressions each side, its front margin 



