40 



FAMILY II. CAJRABIM. 



Horn.— "Synoptic table of the . genus Omophron," in Bull. 

 Brook. Ent. Soc, I, 1878, 4. _ 



Nine speeies are known from the United States, of which four 

 have been taken in Indiana, while one other may occur. 



KEY TO INDIANA SPECIES OF OMOPHRON. 



„ Broadly oval, shining; elytral stria* almost entirely obliterated at apex 

 nnd indistinct on side, the intervals flat; median hue ot thorax 



very faint. , , 



0. Rows of elytral punctures reaching only to middle; color dark 

 brown or nearly black, the side margins of thorax and elytra pale. 



LABIATUM. 



bh rows of elytral punctures, reaching two-thirds the distance from 

 base to apex ; color dark metallic green, pale at sides. 



17. NITIDUM. 



cm Less broadly oval, less convex and less shining; elytral stria, reach - 

 in* to very near the apex, distinct on sides, the intervals convex. 

 c Elvira U-striate; stria? shallow, indistinct at apex, punctures large, 



• - Y IS. ROBUSTUM. 



distant. 



cc Elvtra 15-striate; stride deep, distinct at apex. 

 \l Thorax with side margin only pale. 10. American™. 



ild Thorax with sides, basal and apical margins pale. 



20. TESSELEATUM. 



0. laUatum Fab. occurs in the ''Middle and Southern States," 

 and should he looked for in southern Indiana. (Fig. 27.) 



17 (71) Omophron NiTiDUM Lee, Ann. Lyc. Nat. Hist., IV, 184S, 447. 



Dark metallic green, shining; thorax and elytra with a narrow pale 

 margin, that of the elytra with three irregular projections the first ^ and 

 Lend of which extend inward to the eighth and sixth striae; the thud 

 longer subquadrate and near the apex. Thorax without punctures on 

 pale margins and at center, coarsely and sparsely punctured near base 

 and apex. Punctures of elytra large, distant. Length 5-6 mm. 



Lake County; scarce. Taken by A. B. Wolcott from the beach 

 of Lake Michigan near the station of Pine. April 29-May 28. 



18 (74). Omophron robustum Horn, Trans. Amer. Ent. Soc, III, 1870, 73. 



Pale brownish-yellow; elytra with broken green cross-markings; the 

 strhe with coarse distant punctures. Thorax with a narrow green cross- 

 band, which extends forward and backward at the middle, and an oval 

 green spot each side. Length 6.5 mm. 



Stein collection from southern Indiana. Probably throughout 

 the State, but scarce. Taken by Dury at Cincinnati. 



19 (76) Omophron americanum Dej., Spec, V, 1831, 583. 



Bronzed or greenish-black; head mostly green; thorax and elytra 

 with pale margins, those of the former very narrow. Punctures of elytral 

 stria* rather hue, the intervals strongly convex. Length 6-7 mm. 



