THE FIREFLIES OR LIGHTNING BUGS. 815 



apex much more rounded and hind angles less prominent than in 

 the next. 



1547 (4795). PLATEROS CANALICULATUS Say, Bost. Journ. Nat. Hist., I, 



1835, 154; ibid. II, 0.32. 



Kloiig;it>, depressed. I'.lack ; thorax with yellowish side margins; ely- 

 tra \\illi liuineri somet hues reddish-yellow. Thorax with a narrow hasal 

 channel extending almost to middle. Second joint of antenna* minute, third 

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



Throughout the State; frequent. May 10 July 27. Occurs on 

 leaves of milkweed find various shrubs. 



1548 (4798). PLATEROS FLOKAI.IS Melsh., 1'roc. Phil. Acad. Nat. Sci., II, 



1845, 302. 



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

 Antenna 1 compressed, shorter and much less serrate than in Victor. Tho- 

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

 Length 5-6.5 mm. 



Throughout the State; frequent. June 2-August 11. Beaten 

 from vegetation. 



1549 (4797). PLATEROS LUTOU Newm., Entom. Mag., V, 1838, 382. - 

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



color. Antenna? 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 hasal 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 Slate; frequent. .May 30- July 15. 



V. CALOCHROMUS Guer. 1833. (fir., "beautiful + color.") 



This genus is mainly distinguished by the pubescent velvety 

 surface and feebly striate, not reticulate, elytra. They have the 

 head ending in a short, broad beak; antenna? rather widely sepa- 

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

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

 runs from the middle of the thickened margin. 



1550 (4805). CALOCHROMUS PERFACETUS Say, Anier. Entom., II, 1825, 40 : 

 ibid. I, 4G, pi. 21. 



Elongate, depressed. Black, velvety with fine pubes- 

 cence ; sides of thorax broadly reddish-yellow. Antenna* 

 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. Fv .,. 



315.) (After Knobel.) 



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