816 FAMILY Xr.. LAMPYEIDiE. 



Putnam and G-ibsoii comities; rare. July 4-September 1. 

 Beaten from flowers of the linden, Tilia umericana L. 



Subfamily II. LAMPYRINAE. 



The members of this subfamily have the middle coxa contiguous 

 and the epipleurte wide at the base of elytra. They are divided 

 into two tribes, both represented in the Wtate. 



KEY TO TKIBES OF LAMPYKIN^. 



(I. Head moi-e or less concealed beneath the thorax; antennae usually ap- 

 proximate at base; epimera of metathorax long. 



Tribe I. I/AMPyeini, p. 816. 



aa. Head exposed; antennre widely separated at base; epimera of metatho- 



rax wide. Tribe II. Phenqodini, p. 824. 



Tribe I. LAMPYRINI. 



To this triTDe belong our true flreflies, most genera possessing a 

 light-giving apparatus on the hind abdominal segments. The head 

 is deeply immersed in the thorax, the edges of which are usually 

 expanded into a wide, thin margin. The tribe is separated into 

 twelve genera, rejiresentatives of eight of which have been taken in 

 Indiana. 



KEY TO INDIANA GENEEA OF LAMPY'KINI. 



(I. Antennae with second joint small, usually transverse; head completely 

 covered by thorax. 

 6. Antennae bipectinate, somewhat distant at base, last joint simple ; 

 margins of thorax not flattened. VI. Polyclasis. 



66. Antenna} not pectinate, approximate at b.nse. 

 c. Last joint of antennse elongate, simple. 

 (/. Eyes small ; light organs feeble ; ventral segments without stigma- 

 lilie pores, 

 e. Autennte very much compressed, not serrate; second joint very 

 short, transverse. VII. Lucidota. 



ce. Antenna? with second joint one-half as long as third, or near- 

 ly so. 

 /. Last dorsal segment of male rounded ; light organs wanting. 



VIII. Bllyciinia. 

 ff. Last dorsal segment of male bisinuate and truncate. 



TX. Py'eopyga. 



dd. Eyes large, but larger in male than female; light organs well 



developed ; male with strongly marked stigma-like pores. 



g. Thorax subcarinate ; female with light organs on the sides of 



"^•^""^e"- X. Pyeactomena. 



Of/. Thorax not carinate, frequently grooved; female with light 



organs on llio middle of alnlomen. XL Photinds. 



