THE FIREFLIES OR ■ LIGHTNING BUGS. 831 



Throughout the State; frequent. June 3-June 27. One spe- 

 cies with thorax wholly pale is referred to var. flavicollis Lee. ; this 

 being a variety of modestits and not of hasilaris, as the form of the 

 thorax and relative length of antennal joints plainly show. 



1579 (4889). Podabrus tomentosus Say, Journ. 



Phil. Acad. Nat. Sci., V, 1825, 



165 ; ibid. II, 275. 

 Elongate, slender, parallel. Head, thorax, two 

 basal joints of antennae, abdominal margin and fe- 

 mora reddish-yellow ; remainder of antennse, tibiae 

 and tarsi dusky ; elytra black with fine grayish pu- 

 bescence. Thorax quadrate ; disk finely and sparse- 

 ly punctate, with distinct median line. Length 9- 

 12 mm. (Fig. 324.) 



Throughout the State ; common. ^la\' 21- 

 October 15. Occurs most abundantly on the jj^ 324 ^ 23 



greater ragweed, Ambrosia irifida h., along (original.) 



the borders of streams; also noted at electric light. 



1580 (4890). Podabrus protensi-s Lee, New Sp. N. Am. Col., 1866, 91. 

 Elongate, slender. Blackish; front of head, thorax, legs, basal fifth 



and outer margin of elytra as far as middle, reddish-yellow. Thorax slightly 

 longer than wide, sides feebly curved; disk very finely and sparsely punc- 

 tate; dorsal line deep. Second and third joints of antennae nearly equal 

 and together longer than fourth. Length 11-14 mm. 



Clark, Jefferson and Perry counties; scarce, ^lay 21-June 17. 

 In some specimens, var. faiji Lee, the elytra are wholly dull yellow. 



1581 (4891). PoDABRLS BRrNxicoLLis Fab., Syst. Eleut., I, 1901, 298. 

 Resembles the preceding but more slender. Front of head, sides of 



thorax, margins of elytra, legs and base of antennae yellow. Back of head 

 and disk of thorax coarsely punctured. Thorax longer than wide, the sides 

 parallel, not rounded. Length 7-10 mm. 



Orange County; scarce. May 28-June 2, Beaten from foliage 

 of oak, hickory and wild grape. 



XIX. Sius Latr. 1S29. (Gr., "pug-nosed.") 



Small oblong species having the thorax broader than long and, 

 in the male, notched near the hind angles and bearing two processes 

 on each side near the base. 



KEY TO INDIANA SPECIES OF SILIS. 



a. Base of thorax lobed, deeply foveate inside of hind angles ; notch near 

 the base deep, the appendage behind notch long, compressed and 

 rounded at tip. 1582. percomis. 



[53—23402] 



