126 FAMILY IT. CABAT5IIX3S. 



KEY TO SPECIES OF GROUP C. 



. Color greenish or bluish, base of antennae, palpi and legs reddish-yel- 

 low; base of thorax not cylindrical. 

 &. Basal impressions of thorax deep. 



c. Thorax with the basal half distinctly narrowed, the impressions 

 long, curved ; color purplish or dull green. 



206. EXTENSICOLLIS. 



cc. Basal portion of thorax not distinctly narrowed, the impressions 

 shorter, less curved ; thorax and elytra bright green. 



206a. var. VIRIDIS. 



bb. Basal impressions small, narrow; thorax and scutellum reddish-yel- 

 low. 207. DECORUS. 

 an. Color piceous or reddish-brown ; base of thorax subcylindrical ; elytral 

 intervals convex, marked with a row of small punctures, each punc- 

 ture bearing a fine hair. 208. PUSILLUS. 



206 (772). PLATYNUS EXTENSICOLLIS Say, Trans. Amer. Phil. Soc., II, 1823, 



54; ibid. II, 478. 



Elongate, slender. Head and thorax greenish or bronzed, shining; 

 elytra dull greenish or purplish. Base of thorax finely punctured, the im- 

 pressions with a small, blunt tubercle on the outer side near the hind 

 angles, the latter obtuse. Elytral strife shallow, not punctured; intervals 

 slightly convex, alutaceous, the third with four or five small, remote punc- 

 tures. Length 8-9.5 mm. 



Shores of Fish Lake, Stenben County ; frequent. Lake County 

 by Wolcott, March 26-Jnly 19. 



*206a (772b). PLATYNUS EXTENSICOLLIS VIRIDIS Lee., Ann. Lye. Nat. Hist., 



IV, 1848, 222. 



Differs from the preceding mainly as mentioned in key. Head some- 

 times blackish-green. Thorax with hind angles more rounded and the basal 

 impressions without tubercles. Varies in depth of elytral striae and con- 

 vexity of the intervals ; in some specimens the striae are finely punctured. 



Throughout the State ; rather common beneath rubbish in damp 

 localities. Hibernates. February 21-November 28. 



*207 (773). PLATYNUS DECORUS Say, Trans. Ainer. 

 Phil. Soc., II, 1823, 53; ibid. II. 477. 

 Elongate, slender. Head green or greenish-bronze; 

 thorax, scutellum, legs, and base of antennae reddish- 

 yellow ; elytra blackish, often green near margins. 

 ; Thorax a little longer than wide, slightly narrowed 

 at base, hind angles obtuse; elytral striae shallow, not 

 punctured ; intervals slightly convex, finely alutaceous, 

 distinctly punctured, the third with five to seven small 

 dorsal punctures. Length 7.7-8.5 mm. (Fig. 75.) 



Throughout the State, but scarce. Hiber- 

 75. 4. (Original.) nates. February 8-October 23. Occurs be- 



