THE FIREFLIES OK LIGHTNING BUGS. 819 



A well-marked variety of corrusca taken by Wolcott near 

 Clarke, Lake County, and by inyself in Steuben County; scarce. 

 May 25-June 12. 



1555 (4S15b). ELLYCHNIA LACVSTRIS Lee., Proc. Phil. Aeacl. Nat. Sci., V, 



1851, 334. 



Elongate-oblong, narrow, parallel. Dull sooty-black. Thorax semi- 

 elliptical, its edges only indistinctly paler and sparsely punctate. Elytra 

 finely granulate, with tine costa only fairly distiilct, the others obsolete. 

 Length 5 mm. 



Lake County; rare. July 2. Smaller and much narrower than 

 (tutumnalis and probably a distinct species, though classed as a 

 variety of corrusca by LeConte in his Synopsis. A northern form 

 described from the Lake Superior region. 



IX. PYROPYGA Mots. 1853. (O* "fire i rump.") 



Rather narrow forms, having the antenna? moderately wide and 

 compressed, with second joint transverse, one-third as long as third, 

 the latter in our species longer than fourth -, last dorsal segment in 

 both sexes broadly truncate with rounded angles; segments lobed at 

 the sides, Avirh the angles but feebly produced backwards; light 

 organs but slightly developed. 



KEY TO INDIANA SPECIES OF PYROPYGA. 



a. Thorax with black disk and narrow pit-eons or dusky edges. 



1>. Elytra costate ; length 6.5-s mm. 1556. FKXKSTRALIS. 



l>h. Elytra not costate; length 4.5-0 mm. 1557. XIGRICANS. 



ad. Thorax with black disk and reddish-yellow sides. 1558. DECIPIENS. 



1556 (4817). PYROPYGA FENKSTRAI.IS Melsh., Proc. Phil. Acad. Nat. Sci., II, 



1845, 304. 



Elongate-oval, slender. Black or blackish-brown ; thorax with a large 

 reddish-yellow subtriangular space on each side of the black central disk. 

 Elytra finely granulate and with two or three rather indistinct r<>st;e. Length 

 6.5-8 mm. 



Laporte, Steuben, Marshall and Vigo counties; frequent. June 

 1 it-August 17. Taken by sweeping grass and low herbage, usually 

 in moist meadows. 



1557 (481s). PYROPYGA NIGRICAXS Say, Journ. Phil. Acad. Nat. Sci., Ill, 



1823, 370; ibid. IT. 110. 



Resembles the preceding in form and in color of thorax. Differs mainly 

 in its smaller size and lack of raised lines on elytra. Length 4.5-6 mm. 



Steuben, Starke and Marshall counties; frequent about tam- 

 arack marsh; s. June 17-Juiv !">. 



