820 FAMILY XL. — I.AJII"iRIDJ':. 



1558 (481!i)). Pykoi'yga dkcipiens Harris, Trails. Hartford Soc, 1S36, 74. 

 Eloiigiite-oval. Lilack or rusty black ; thorax with a wide i>ale reddish- 

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

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

 and with surface more coarsely granulate than in nU/iiruiifs. Length 5- 

 7 mm. 



Northern half of State; freriuent. June 17-July 24. 



X. Pi'KACTOMEN.'V Lec. 18.51. (Gr., "to set on fire.") 



Antennae narrow, not serrate; the thora.x snbcarinate with sides 

 broadly reflexed. 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 fa;df way betvs^een the middle and 

 side by a large round stigma-like pore or sjiot; 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 kno«'n species have been taken 

 in the State. 



KEY TO INDIANA SPECIES OF PYRACTOMENA. 



a. Elytra witli wide side margins. 1550. angitlata. 

 aa. Elytra \-\ith narro^A- side margins. 



6. Antennai shorter than tliorax. l.'iCO. bokealis. 



hb. Antenna' loii,i,'er than thorax. IStil. lucifera. 



1559 (4823). I'yract(>.\ien.\ angilata Say. Journ. Phil. .Vcad. Nat. Sei., V. 



1825, 162 ; ibid. II, 270. 



Elongate, depressed. Blaekish-liruwu ; tliorax with a 

 dark median space and dusky lateral margins, between 

 which the area is .vcllow tinged with reddish on basal half; 

 elytvii with suture and narrow side margins pale. Thorax 

 with fr.ait margin obtusely angulate. Elytra finely .granu- 

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



Fig. 317. y u. eosta'. Ventral segments of female dull yellow spotted with 



(After Knoljel.) ^,„s,;^,. Length 8-15 mm. (Fig. ;U7.) 



Throughout the State; frequent. A! ay 10-Tuly S. One of our 

 most common fireflies. 



1.5(;0 (4S24). I'YHACTOMBNA miKEAiis Kaiul., Kost. .lourn X-it Hist H 

 ]s:!N, 16. ■' ' 



Resembles anfnilat,, closely in form and general appcirancc The m-ir- 

 gms of both tlierax and elytra are narrower and those of the' former are 

 .yellow instead of dusky as in „nf,uU,la. The central black s|,ot is usually 

 smanc- an, the red one each side larger. A,ite,n.o stout and shorter than 

 thor..x. Abdomen of female in great part dark. Length 10-15 mm 



