108 



FAMILY II. CARABITL3C. 



ee. Sides of thorax not flattened ; prosternum without setae ; pieeous, 

 shining. 166. chalcea. 



dd. Prosternum of male smooth as in the females and without setae; 

 sides of thorax not flattened. 

 f. Elytral stria? fine, the intervals flat ; thorax distinctly emarginate 

 at apex. 167. sub^nea. 



ff. Elytral strife deep, the intervals convex ; thorax nearly truncate 

 at apex. 



g. Form oblong; hind angles of thorax much rounded; sides of 

 metasternum coarsely punctate ; larger, 6-7 mm. 



168. eubeica. 



gg. Form more oval; hind angles subr octangular or obtuse; me- 

 tasternum smooth ; smaller, not over 5.5 mm. 



169. MUSCULUS. 



162 (670). Amaba intebstitialis Dej., Sp. Gen. Ill, 1828, 472. 

 Oblong-oval, moderately convex. Color variable; brownish-bronze to 



green, cupreous or nearly black. Thorax less than twice as wide at base 

 as long, apex feebly emarginate, hind angles rectangular ; basal impressions 

 usually distinct but shallow, the outer oblique, the inner short, not punc- 

 tured. Elytral stride with very hue, indistinct punctures; intervals more 

 or less convex with undulating surface. Length 7-9 mm. 



A species of northern range, rare in Indiana. A single speci- 

 men was taken in Vigo County from beneath drift in a swamp. 

 Several others were obtained near Hessville and Wolf Lake, Lake 

 County, by Wolcott. March 26-May 26. 



163 ("669). Amaba eeeatica Sturm, Deutsche Ins., VI. 55. 

 Elongate-oval. Bronzed-cupreous or nearly black, shining ; antennae 



pieeous black, the two basal joints often reddish; under surface and legs 

 pieeous, shining. Thorax not twice as wide at base as long at middle, sides 

 narrowing to front, hind angles rectangular; basal impressions very feeble, 

 the outer usually the smaller and obliquely placed ; surface rarely slightly 

 punctate near the inner depression. Elytra finely striate, the striae finely 

 but distinctly punctured ; intervals flat or slightly convex, alutaceous in 

 female. Length 6-7.5 mm. 



Lake County ; scarce. March 26-June 26. A circumpolar spe- 

 cies which finds its southern limit in the transition life zone of 

 northern Indiana. Although Horn says in his key that the surface 

 is not alutaceous it is distinctly so in the female. 



164 (674). Amaba obesa Say. Trans. Araer. Phil. Soc, II. 

 1823, 37; ibid. II. 464. 

 Oblong-oval, robust, not very convex. Pieeous black, shin- 

 ing ; elytra opaque in female; antennae and legs reddish- 

 brown. Thorax one-half broader than long, hind angles 

 rectangular; basal impressions double, finely punctate, the 

 outer deeper and with an external carina. Elytral strise 

 more deeply impressed at apex, very finely punctured. Length 

 (AEterRileyO 9-12 mm. (Fig. 66.) 



