THE FIREFIilKS OR LIGHTNING BUGS. 815 



;i[)t'.\ imicli iiiorc fdiiiKlcd ;iii(l iiiml Jiiiuics less ])r()inineni than in 

 the next. 



1547 (4795). Plateros canaliculatus Say, Bost. Journ. Nat. Hist., I, 



1S35, 154 ; ibid. II, 632. 



Eldusate. depressed. Black; thorax with yellowish side margins; ely- 

 tr;i with hiniieri soiuetiiiies reddish-yellow. Thorax with a narrow basal 

 channel extending almost to middle. Second jninl ot antenn:ie minnte, tiiii'd 

 half the length of fourth. Length 5-S mm. 



Throiio-hout the State; frequent. May 10-.Jnly 27. Occurs on 

 leaves of niilkwcu'd and various sln-ul)s. 



1548 (479S). I'LATKROS floralis Alelsh., Proc. Phil. Acad. Nat. Sci.. II, 



1845, 302. 



Elongate, slender. Black, the side margins of thorax broadly yellow. 

 Anteumc compressed, shorter and much less serrate than in Jictor. Tho- 

 rax with apex more broadly rounded and sides straighter than in the next. 

 Length 5-6.5 mm. 



Thronghout the State; freciuent. June 2-August 11. Beaten 

 from vegetation. 



1549 (4797). Plateros lictor Newm., Entom. Mag., V, 1838, 382. 

 Elongate, more slender than the preceding, with which it agrees in 



color. Antennse of male long, strongly serrate, third joint triangular, as 

 wide as long, fourth longer, not wider; those of female broader, less ser- 

 rate. Thorax subpentagonal, with the front margin raised and less broadly 

 rounded; the disk with an elongate channel on basal half, this extending 

 to middle in male, shorter and broader in female. Elytra with well marked 

 equal lines and more finely cross-barred interspaces. Length 5-7 mm. 

 Throughout the State ; frequent. INIay 30-July 15. 



V. Calochromt^s Gner. 1833. (Gr., "beautiful + color. ") 



■ This genns is mainly distinguished by the pubescent velvety 

 surface and fee1)ly striate, not reticulate, elytra. They have the 

 head ending in a short, broad ]ieak ; antennas rather widely sepa- 

 rated, subserrate, with joints thicker and less compressed ; thorax 

 with an entire median groove, toward which a short, oblicpte ridge 

 runs from the middle of the thickened margin. 



1550 (4805). Calochromus perfacetxs Say. Amer. Entom., II, 1825, 46; 

 ibid. I, 46, pi. 21. 



Elongate, depressed. Black, velvety with fine pubes- 

 cence; sides of thorax broadly reddish-yellow. Antenmie 

 with second joint one-third the length of third, the latter as 

 long but not as wide as fourth. Side margin of thorax im- 

 pressed at the middle, the basal lateral impressions deep. 

 Middle and hind tibi:e curved. Length 6.5-9.5 mm. (Fig. 

 315.) 



152—23402] 



