FIREFLY GENUS PYRACTONEMA — McDERMOTT 149 



but occasionally completing a narrow border around the apex. This 

 border and/or the median vitta may be absent, but in these cases 

 there is an indistinct triangular infuscation in the apical half. Re- 

 mainder of pronotum transparent or at least translucent colorless to 

 yellowish. Lateral edges reflexcd, apically little if at all so. 



Scutellum and mesonotal plates black to dark brown. 



Elytra subparallel, giving a narrowly elliptical outline. Black. 

 Explanate margins narrow, about one-sixth of elytral width. 



Frons black. Not markedly bulbous between the antennae. 



Antennae about half of body length in both sexes. Narrower than 

 in the P. nigripennis group and appear only slightly serrate. 



Tergites all dark brown to black. Pygidium in male may be truncate, 

 bidentate, or tridentate, or sinuate: in female, tapering to a broadly 

 rounded apex. Posterolateral pointed lobes on 5, 6, and 7 less de- 

 veloped in the female. 



Ventral segments all dark brown to black. Sometimes with narrow 

 black apical borders. Rudimentary luminous organs usually absent, 

 sometimes represented by pale spots. 



Legs black. Tibial spurs very small, pattern apparently 0-1-1. 

 Claws simple. 



Aedeagus as in figure 6. 



Pyractonetna minor, new species 



Material: 6 males and 5 females, 3 pairs in copulation, and portions 

 of about a dozen other specimens. Holotype, allotype and 5 para- 

 types in the Peria collection. 



Type locality: Quillota, Las Palmas, Valparaiso Province, Chile. 



Dimensions: Males 3.5 to 5.1 mm. long by 1.0 to 1.65 mm. broad. 

 Females 4.25 to 5.5 mm. long by 1.15 to 1.65 mm. broad. 



Pronotum: Conspicuously nearly as long as broad, widest at apical 

 third, narrowing slightly to base; angles obtuse. Apical and lateral 

 borders black, with submarginal punctures. Basal two-thirds orange- 

 red (yellow in one specimen). Apical third transparent back of black 

 border. Disc flat and smooth. No median vitta. 



Scutellum and mesonotal plates black. 



Elytra black, parallel, rngose. Very narrow explanate margins 

 which may appear paler than the disc. About 0.8 of total length in 

 males, shorter in females, in which 1 to 3 abdominal segments may be 

 exposed. 



Body completely black. Thin and flat in horizontal plane. No 

 indication of luminous organs. Pygidium trilobed. 



Head black. Mouth parts very small and of same character as in 

 other species. 



Antennae black, compressed, scarcely serrate. Article 3 widest, 4 



