138 FAMILY II. CARABID^E. 



nearly so. Head rhomboidal, prolonged behind the eyes and nar- 

 rowed to a very slender neck. Mentum deeply emarginate, toothed. 

 Thorax elongate, narrower than head, the margins very feeble ; sides 

 with a bristle-bearing puncture near the middle and another at 

 hind angle. Elytra oblong-oval, not margined at base, side mar- 

 gins distinct and entire, tips rounded. Tarsi alike in both sexes, 

 the first joint as long as the next two. which are oval, the fourth 

 broad, deeply bilobed. Males with one seta on each side of apex of 

 last ventral segment ; females with two. The tribe is represented 

 in the United States by a single genus. 



XXXVI. LEPTOTRACHELUS Latr. 1802. (G-r., " slender + tho- 



rax.") 



Thorax narrow, elongate. Ligula entire, slender, usually nar- 

 rowed in front. But one species and a variety occur in the United 

 States. The former is found in Indiana. 



240 (846). LEPTOTBACHEI.US DORSALIS Fab.. Syst. EL. I. 229; Say. II. 447. 

 Elongate, very slender. Head and usually the thorax piceous ; an- 

 tennae, legs and elytra brownish-yellow, the latter with a piceous stripe 

 along the suture. Thorax subcylindrical, one-half longer than wide, finely 

 and sparsely punctured near base and apex. Elytral striae rather deep, 

 with close, distinct punctures : intervals convex, the third with three small 

 punctures. Length 7-8 mm. 



Lake, Wells and Spencer counties : one specimen from each. 

 May 14 May 28. Occurs on low herbs in open woods and probably 

 inhabits the entire State. 



Tribe XI. ODACANTHIXI. 



Antennas slender, free at base, first joint as long as the next two. 

 three basal joints glabrous. Head oval, elongate, prolonged behind 

 the eyes and narrowed to a neck. Thorax narrow, the margin 

 feeble or entirely obliterated, sides with a seta near the middle and 

 a second, often feeble, at hind angles. Elytra oblong-oval, base not 

 margined, sides narrowly inflexed. apex truncate. Tarsi slender, 

 rarely flattened, the fourth joint entire or feebly emarginate; daws 

 simple. The tribe is represented in the United States by a single 

 genus. 



XXXVII. CASXONIA Latr. 1806. (Gr., "to look toward + noth- 



ing.") 



Very slender beetles, having the bristlp-bparing punctures of 

 the second stria of elytra indistinct and rarely more than four in 

 number. One species occurs in the State. 



