824 FA MIL v XL. L 



yellow, the latter with disk red with a narrow median dark stripe; ely- 

 tra brown or piceous, with the suture, narrow side margins and a nar- 

 row stripe on disk pale. Labrum tridentate. Thorax and elytra densely 

 and rather roughly punctured. Length 11-15 mm. (Fig. 319.) 



Throughout the State; our most common firefly. May 23-Au- 

 gust 6. 



Tribe II. PHENGODINI. 



In this tribe the thorax, though rounded in front, does not cover 

 the head. The eyes are convex, prominent and widely separated ; 

 antenna 1 not approximate, plumose or with fan-like processes in 

 male; middle coxa 1 contiguous. Two genera are represented in the 

 State. 



KEY TO INDIANA GENEKA OF PHENGODINI. 



a. Prosternum very short ; front flat, labrurn large ; elytra short, awl- 

 shaped; tarsi with fourth joint lobed. XIV. PHENGODES. 

 ad. Prosternum well developed; front convex, labruui small; auteunre ser- 

 rate. XV. TYTTHONYX. 



XIV. PHENGODES Illig. 1807. (Gr., "shining.") 



Medium-sized species, having the head deeply and transversely 

 excavated behind the eyes; gular region deeply excavated, the su- 

 tures confluent. One species is known from the State. 



15<iO (4S52). PHENGODES PLVMOSA Oliv., Ent.. II, 1790, 26. 



Elongate, robust, depressed. Dull yellow, finely pubes- 

 jW cent ; head, antenna?, tips of elytra and dorsal surface of 

 abdomen fuscous. Antenna? of male feather-like, the third 

 and following joints emitting long flexible branches. Tho- 

 rax more than twice as wide as long, almost smooth. Ely- 

 tra one-third the length of abdomen, very widely separated 

 at tips. Length 11-12 mm. (Fig. JIL'O.) 



Fig. 320. x ii. One in Webster collection lab -led "Ind." Seems 



(After Glover.) , . T 



to be everywhere rare, though Say says: JNot un- 

 common for a short period in autumn when, attracted by candles, 

 they enter the house in the evening ami Hy repeatedly against the 

 ceiling in their efforts to escape." 



XV. TYTTHONYX Lee. 1S51. ((-Jr., " small + claw.") 



Eyes small, rounded, convex: antenna- nearly as. long as tin- 

 body, broadly compressed, strongly serrate, joints triangular, tin- 

 second but one half as long and one half as wide as third ; the 

 outer joints of male longer, narrower and more prolonged at tip 

 the joints preceding. One species is known. 



