820 



FAMILY XTi. I , A iJ P Y RT . 



1558 (4S20). Pybopyga decipiens Harris, Trans. Hartford Soc, 1S36, 74. 

 Elongate-oval. Black or rusty black ; thorax with a wide pale reddish- 

 yellow margin. Antennae less slender than in the other two species, the 

 joints one-half longer than wide. Elytra each with two subobsolete costae 

 and with surface more coarsely granulate than in nigricans. Length 5- 

 7 mm. 



Northern half of State: frequent. June 17-July 24. 



X. Pykactomena Lee. 1851. (Gr., "to set on fire.") 



Antenna narrow, not serrate: the thorax snbearinate with sides 

 broadly refiexed. Light organs are well developed in both sexes : 

 those of the male being located on the fifth and sixth ventral seg- 

 ments and marked each side about half way between the middle and 

 side by a large round stigma-like pore or spot ; those of female are 

 at the sides of the segments, which are dusky or piceous at middle, 

 and are also accompanied by distinct pores. The males have the 

 last dorsal segment emarginate, seventh ventral truncate, and the 

 eighth small. Three of the four known species have been taken 

 in the State. 



KEY TO INDIANA SPECIES OF PYKACTOMENA. 



a. Elytra with wide side margins. 1559. anguiata. 

 aa. Elytra with narrow side margins. 



1). Antennae shorter than thorax. 1560. bokealis. 



&Z>. Antenna 1 longer than thorax. 1561. luctfera. 



1559 (4S23). Pyeactomena angtjlata Say. Journ. Phil. Acad. Xat. Sci.. V. 



1825, 162 ; ibid. II, 273. 



Elongate, depressed. Blackish-brown ; thorax with a 

 dark median space and dusky lateral margins, between 

 which the area is yellow tinged with reddish on basal half; 

 elytra with suture and narrow side margins pale. Thorax 

 with front margin obtusely angulate. Elytra finely granu- 

 late, not punctured, each with two or three well marked 

 Fie;. 3U- x H. costaj. Ventral segments of female dull yellow spotted with 

 (After Knobel.) c i lis ky. Length S-15 mm. (Fig. 317.) 



Throughout the State; frequent, May 10-July 8. One of our 

 most common fireflies. 



1560 (1821). Pyeactomena borealis Rand.. Post. Journ. Nat. Hist.. IP 



1838, 16. 



Resembles angulata closely in form and general appearance. The mar- 

 gins of boththorax and elytra are narrower and those of the former are 

 yellow instead of dusky as in angulata. The central black spot is usually 

 smaller and the red one each side larger. Antenna? 8tout and shorter than 

 thorax. Abdomen of female in great part dark. Pength 10-15 mm. 



