THE GROUND BEETLES. 



47 



Fig. 34. 



It is sometimes called the 



31 (127). CALOSOMA SCRUTATOR Fab., Sys. 



Hut., I, 17S5, 239. 



Oval, robust. Disk of thorax blue or 

 purplish-black, the margins golden or red- 

 dish-bronzed ; legs blue ; abdomen green and 

 red. Thorax very short, more than twice as 

 wide as long, nearly smooth, sides and hind 

 angles rounded. Elytra striate, punctured. 

 Middle tibia? of male curved and with a 

 dense brush of hairs on the inner surface 

 near the tip. Length 28-30 mm. (Fig. 34.) 



This large green species is one of the 

 most common and most handsome of the 

 ground beetles. It occurs in all parts of 

 the State and is often attracted by hund- 

 dreds to the electric lights of the cities, 

 "searcher" or "caterpillar hunter," MS it ascends trees in search of 

 caterpillars, catching and feeding upon many injurious forms. 

 Both it and C. calidum give off a very disagreeable odor when 

 handled. May 11-July 14. 



32 (128). CALOSOMA WILLCOXI Lee., Ann. Lye. Nat. Hist., IV, 1848, 446. 



Very similar to scrutator but much smaller and with a narrower 

 thorax. Margin of elytra sometimes green. Middle tibire of male straight ; 

 not hairy. Length 18 mm. 



Very common along the beach of Lake Michigan in May and 

 June; less frequent in southern Indiana. April 26-Jnne 10. Often 

 attracted by electric light. 



33 (129). CALOSOMA FRIGIDUM Kirby, Faun. Bor. Arner.. 

 IV, 1837, 19. 



Oval, rather slender. Black above, greenish-black below ; 

 thorax and elytra with narrow green margins. Head and 

 thorax sparsely and rugosely punctate. Elytra with fine 

 punctured strife, each with three rows of distant, round. 

 green impressed spots. Length 20 mm. (Fig. 35.) 



A northern species which has been taken in Indi- 

 ana only along the beach of Lake Michigan, where it 

 is found in May and June in small numbers. May 

 Fig. 35. 27-June 29. 

 34 (142). CALOSOMA CALIDTJM Fab., Syst. Ent., I, 1785, 237. 



Oval, robust. Black above and below; elytra with three rows of red- 

 dish or copper colored pits. Head and thorax finely rugose, not punctate, 

 the latter with broad basal impressions. Elytral stria? deep, finely punc- 

 tured; intervals broad and. as in several of the other species, appearing as 

 if composed of overlapping scales. Length 21-23 mm. (Fig. 30.) 

 [4 23402 J 



