THE GENUS CALOSOMA. 17 



Of the species described by Mr. H. C. Fall x in 1910, namely, 

 eremicola, parvicollis, and tristoides, the writers have seen a repre- 

 sentative of the last only, which is mentioned above. The other two 

 could not be added to the table for separating the species, as the 

 characters of the male tarsi are not given in the description. 



TABLE FOR DETERMINING ADULTS OF CALOSOMA. 



Anterior tarsi of male with joints 1-4 hairy beneath. 



Thorax with sides broadly flattened behind; body elongate, black. 



Elytra deeply striate, with blue border ] . externum. 



Elytra smooth, with a few punctures on the basal half 2. macrum. 



Elytra with series of fine punctures 3. protractum. 



Thorax narrowed behind, sides not flattened; elytra deeply striate. 

 Elytra gold -green with red margin. 



Larger; middle tibiae of male curved and with a dense brush of hairs 



on the inner surface near the tip 4. scrutator. 



Smaller; middle tibiae of male straight, not hairy 5. wilcoxi. 



Elytra black to slightly bronze, with three rows of small greenish-bronze 



punctures 6. frigidum. 



Elytra coppery to greenish-bronze, with coppery-green margins; punctures 

 same shade as elytra. 



(Europe, introduced into Massachusetts) 7. inquisitor. 



Anterior tarsi of male with joints 1-2 only hairy beneath. 



Thorax trisinuate behind, elytra deeply striate with three rows of golden 



foveae 8. sayi. 



Anterior tarsi of male with joints 1-3 hairy beneath. 



Green species with underside of body bluish-black or greenish-black; elytral 

 spots faint and same color as elytra. 

 Elytra deeply and regularly striate. 



(Introduced and established in New England) 9. syeophanta. 



Elytra reticulate, granular. 



(Europe, introduced into Massachusetts) . , 10. reticulatum. 



Black species without golden spots (faint bluish-green spots in obsoletum); striae 

 of elytra faint and obliterated behind (except in angulatum). 

 Elytra narrowly margined: 



Side margin of thorax meeting the base in a well-defined angle (except 

 in par biceps). 

 Head coarsely punctured, thorax strongly angulated at the sides. 



Elytra deeply striate from base to apex 11. angulatum. 



Elytra faintly striate from base to apex 12. peregrinator . 



Elytra faintly striate on basal half, becoming obliterated to- 

 wards apex. 



Thorax strongly angled at sides 13. prominens. 



Thorax arcuate at sides 14. parviceps. 



Head with a few coarse punctures in front. 



Elytra with coarse transverse punctures near base . . 15 . lugubre. 

 Head smooth; thorax narrowly margined. 



Elytra nearly smooth, oval; wings feebly developed. 10. palmeri. 

 Side margin of thorax meeting the base in a curve. 

 Thorax slightly bisinuate behind. 



Basal impressons slight; elytra nearly smooth 17. triste. 



Basal impressions broad; elytra with scaly sculpture. 



18. obsoletum. 

 Thorax emarginate behind, hind angles broad, prolonged. 



Without luster; transverse basal grooves of elytra as prominent 



as longitudinal striae 19. semilaeve. 



Without luster- transverse basal grooves of elytra not as promi- 



inent as longitudinal striae. . ." 20. simplex. 



Elytra smooth, more broadly margined, oval; wings wanting (form robust, 



nearly as in triste) 21. haydeni. 



Elytra smooth, more broadly margined, oblong-oval ; wings well developed 

 (form robust and posterior angles of thorax not as broadly reflexed as 

 in triste) 22. tristoides. 



i Fall, H. C. Miscellaneous notes and descriptions of North American Coleoptera. In Trans. Amer. 

 Ent. Soc, v. 36, pp. 89-197 (pp. 90-92), 1910. 



54880°— Bull. 417—17- — 2 



