108 FAMILY IT. OA 



ee. Sides of thorax not flattened ; prosternum without sefee; piceous, 



shining. 166. CHALCEA. 



<ld. Prosternum of male smooth as in the females and without setje : 



sides of thorax not flattened. 



/'. Elytral stria? tine, the intervals fiat ; thorax distinctly emarginate 



at apex. 167. SUB^NEA. 



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



at apex. 



<j. Form oblong; hind angles of thorax much rounded; sides of 

 metasteruum coarsely punctate ; larger, 6-7 mm. 



168. KUBKICA. 



</</. Form more oval: hind angles suhrectangular nr ohtnse; me- 

 tasternum smooth : smaller, not over 5.5 mm. 



169. MUSCULUS. 



162 (670). AMARA INTERSTITIALIS Dej.. Sp. Gen. III. 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 stria' with very line, 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 n^ar Hessvillc and Wolf Lake, Lake 

 County, by Wolcott. March 26-May 26. 



163 ('669). AMAKA KKKATICA Sturm, Deutsche Ins.. VI. 55. 

 Elongate-oval. Bronzed-cupreous or nearly black, shining: antenna- 



piceous black, the two basal joints often reddish: under surface and legs 

 piceous, 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 stria? finely 

 but distinctly punctured: intervals fiat or slightly convex, alutuceous 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. 



Ki4 ;74l. A.MAKA OP.KSA Say. Trans. Ainer. Phil. So<-.. II. 



1S2.",. .".7: ibid. II. 464. 



oblong-oval, robust, not very convex. Piceous black, shin- 

 ing; elytra opaque in female: antenna' and legs reddish- 

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

 rectangular; basal impiv^si: us double, finely punctate, the 

 M \ outer deeper and with an cxlt'i-nal carina. Elytral strite 

 more deeply impressed al apex, very finely punctured. Length 



I'll', fio. X 2. 



i After Rilcy > 9-12 rnm. (Fig. 66.) 



