THE GEOUND BEETLES. 41 



Common throughout the State. April 23-September 5. Some- 

 times oc-curs under rubbish remote from water. 



20 (77). Omophron tusselatum >Sa.v. .Tourii. I'Uil. Acad. Nat. 

 Sti.. Ill, ls2y, l.ji>; ibid. II, !17. 

 I'ale browiiisli-yellow ; head with a greeu baud acrciss tlie 

 b.iso; tliorax with a small, subquadrate greeu si)at which is 

 lirolouged bacliward and forward along a deeiily liuiiress^ei 

 median line; elytra with cross-markings metallic green, the , '^' 



, „ ^, (After Leng.) 



liunctures ot the istna' close and hue. Thorax coarsely imnc- 



tured near Ikisc and ai)ex, more finely ami very sparsely at middle and 



sides. Length (j-7 mm. (Fig. 2S.) 



Common in the northern part of the State ; rare in the southern 

 portion. May 22-August 22. 



Tribe II. CYCHKIXI. 



Head more or less constricted; neck often semi-giobose; an- 

 tenna; slender, inserted under a feeble frontal ridge; labriim deep 

 ly forked ; body not pedunculate ; ssutellum very small. Prester- 

 num not prolonged behind the coxa^ ; hind coxaj separated by a tri- 

 angular process of the abdoijien. The tribe is represented in the 

 eastern United States by two genera, separated as follows: 



KEY TO GI■:^'ERA OE CYCHHIKI. 



a. Antenme with four basal joints glaljrous. II. Cychrus. 



au. Autemue with two basal joints glabrous. No.maretus. 



Of these only specimens of Cijchrus have as yet been taken in 

 Indiana, though two or three species of Xomantus should be found 

 here. They are black or violaceous in color and 10-13 mm. in 

 length. 



II. Cychrus Fab. 1794. (Gr., "a ground runner.") 



Beetles of medium or large size, violaceous or brownish-purple 

 in color, having the head elongate, the mandibles long, slender, 

 curved and without a bristle-bearing* puncture on the outer side ; 

 labial and maxillary palpi very long, the last .joint hat-^het-shaped 

 and concave. The elytra have 1-t to 18 very distinct striaj, which 

 are sometimes irregular or replaced by tubercles. Tiie sperdes live 

 beneath stones and leaves, usually in moist woods, and feed upon 

 snails, their long heads having, in the course of time, be 'ome especi- 

 ally adapted to extracting these animals from their shells. For 

 synopses of the genus see : 



