THE SHORT- WINGED STAY KXGEIi BEETLES. 



415 



The following papers treat of the North American species of the 

 subf amily : 



LeConte. — "Synoptic Tables of Lathrobiiim, Stilicus and 

 Sunius," in Trans. Amer. Ent. Soc, VIII, 1880, 174-180. 



LeConte. — "Synoptic Tables of Cryptobium,, Pcederus and Pala- 

 minus/' in Proc. Amer. Phil. Soc, XVII, 1878, 390-397. 



Horn. — "A Study of the Species of Cryptobium of North Amer- 

 ica." in Trans. Amer. Entom. Soc, XII, 1884, 85-106. 



Casey. — "A Revision of the American Pa?derini," in Trans. 

 Acad. Sci. St. L., XV, 1905, 17-248. 



As above defined, the subfamily is represented in Indiana by 

 two tribes : 



KEY TO INDIANA TEIBES OF PiEDERINiE. 



a. Last joint of maxillary palpi very small, awl-shaped. 



Tribe I. P^ederini, p. 415. 

 aa. Last joint of maxillary palpi as large as the third, obliquely hatchet- 

 shaped. Tribe II. Pinophilini, p. 440. 



Tribe I. PiEDERIXI. 



This tribe as above limited is composed of a large number of 

 genera, the following o^ which are known to occur in Indiana: 



KEY TO INDIANA GENERA OE P2EDERINI. 



a. Fourth joint of hind tarsi not lobed beneath. 



1). Antennae elbowed at the end of the long basal joint; front tarsi not 

 dilated. 



c. Mandibles each with three teetb on the inner side ; males with last 

 ventral not notched, the second and third ventrals each with a 

 fold or pit at middle. XLIII. Cryptobium. 



cc. Mandibles each with two teeth ; males with the last ventral 

 notched, the second and third without folds or pits. 



XLIV. Hesperobicm. 



1)1). Antennae straight or nearly so, the basal joints not greatly elongated. 

 (l. Prostemum shortened between and under the front coxae, ending 

 in an acute point which does not reach the mesostemum. 

 e. Labrum bi lobed; sculpture never very dense, the surface more 

 or less shining ; front tarsi strongly dilated in both sexes ; 

 ligula bilobed at tip. XLV. Lathrobium. 



ee. Labrum with a distinct median tooth ; sculpture very dense, the 

 surface subopaque ; front tarsi variable; ligula with a dense 

 fringe of hairs at tip. 

 f. Front tarsi moderately dilated, densely padded beneath ; first 

 joint of bind tarsi one-half longer than second: length 

 6.5 mm. XLVI. Aderocharis. 



ff. Front tarsi not dilated; first joint of hind tarsi only slightly 

 longer than second; length 3.7 mm. Lithocharis. 

 [27—23402] 



