816 



FAMILY XL. LAMPYRID^E. 



Putnam and Gibson counties; rare. July 1-Septeniber 1. 

 Beaten from flowers of the linden, Tilia americana L. 



Subfamily II. LAMPYRINAE. 



The members of this subfamily have the middle coxae contiguous 

 and the epipleura? wide at the base of elytra. They are divided 

 into two tribes, both represented in the State. 



KEY TO TRIBES OF LAMPYRINI. 



a. Head more or less concealed beneath the thorax; antennae usually ap- 

 proximate at base ; epimera of metathorax long. 



Tribe I. Lampyrini, p. 816. 

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

 rax wide. Tribe II. Phengodini. p. 824. 



Tribe I. LAMPYRINI. 



To this tribe belong our true fireflies, 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, representatives of eight of which have been taken in 

 Indiana. 



KEY TO INDIANA GENERA OF LAMPYRINI. 



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

 covered by thorax. 

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

 margins of thorax not flattened. VI. Polyclasis. 



1)1). Antennae not pectinate, approximate at base. 

 c. Last joint of antennae elongate, simple. 

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

 like pores. 



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

 short, transverse. VII. Lttcidota. 



ee. Antennae with second joint one-half as long as third, or near- 

 ly so. 



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



VIII. Ellychnia. 

 ff. Last dorsal segment of male Insinuate and truncate. 



IX. Pyropyga. 



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 

 abdomen. X. Pyractomena. 



gg. Thorax not carinate, frequently grooved; female with light 

 organs on the middle of abdomen. XL Photinus. 



