46 



FAMILY II. CAE ABIDES. 



IV. Calosoma Weber. 1801. (Gr., ££ beautiful + body.") 



Large species, green, black or bronze in color, having the tooth 

 of mentum simple and third joint of antennae strongly compressed. 

 Some of them are very common beneath logs and stones in open 

 woods and about the borders of cultivated fields, and are often at- 

 tracted in numbers by electric lights. They are among the most 

 beneficial of the Carabidse, feeding almost wholly upon caterpillars, 

 cutworms and other injurious larvae. About 25 species are known 

 from the United States, five of which have been taken in Indiana, 

 while another doubtless ozeurs. The following papers are the prin- 

 cipal ones treating of the genus; 



LeOonte.— "Notes on the Species of Calosoma Inhabiting the 

 United States" in Proe. Phil. Acad. Nat. Sci.. 1862, 52, 



LeCpnie.— ' Synoptic Table" in Bull. Brook. Ent. Soc, I. 1878, 

 64. 



30. EXTEUNuM. 



31. 

 32. 



SCRUTATOR. 

 W1LLCOX1. 



KEY TO INDIANA SPECIES OF CALOSOMA. 



a. Elytra without rows of metallic spots. 



b. Elytra black with blue border: length 30 nun. 

 hb. Elytra metallic green with red margin. 

 c. Length more than 25 mm. 

 cc. Length less than 20 mm. 

 an. Elytra black, each with three rows of golden or metallic green im- 

 pressed spots. 

 d. Spots of elytra green. 



c. Length 20 mm.: front tarsi of males with four joints hairy be- 



° , , 33. FRIGID!" M. 



neath. 



cc. Length 25 or more mm. : front tarsi of male with two joints hairy 

 beneath. ayi. 

 del Spots of elytra golden, very rarely green: front tarsi of male with 

 three joints hairy beneath. 34. calidlm. 



30 (124). Calosoma externum Say. Journ. Phil. 



Acad. Nat. Sci,. III. 1S23. 150: ibid. 

 II. 96. 



Elongate robust. Black, subopaque: side margins 

 of thorax and elytra blue. Thorax with sides rounded, 

 broadly flattened and reflexed behind: hind angles 

 obtusely rounded. Elytra almost parallel to apical 

 fourth, the stria? with distinct pmrr-tures. Length 

 30 mm. (Fig. 33.) 



Throughout the State but nowhere common. 

 May i3-Otober 18. Occurs singly or in pairs 

 beneath cover in open woods. 



Fig. 33 



