142 PROCEEDINGS OF THE NATIONAL MUSEUM 



Tergites all black. Pygidium in male as wide as 7th segment, 

 deeply emarginate, in female triangular. 



Ventral segments 2 to 6 very dark brown to black, 7 and 8 black. 

 Segment 8 medially bulbous in male to accomodate the aedeagus. No 

 indication of luminous organs. In female, segment 8 ogival, with 

 deep V-shaped median apical notch, not bulbous, and usually exposed 

 beyond the elytra. 



Legs black, hairy, compressed. Tibial spurs discernible with diffi- 

 culty, pattern apparently 0-1-1. Claws without basal spurs. 



Aedeagus as in figure 1. 



A small species, readily recognizable by the white-margined elytra. 

 Of this species there were 51 specimens, including 10 females, of which 

 many were longer than the 7.7 mm. maximum given by Solier. There 

 were also 6 smaller specimens, 4 of which were females. 



Pyractonema angustata, new species 



Figure 2 



Material: 7 males and 3 females, including one pair in copulation. 

 Distinguishable from other species by narrow, parallel form and the 

 absence of infuscation on the pronotum. Two of the females were 

 brachelytral, leaving 3 abdominal segments exposed. 



Type locality: Enco, Chile. 



Holotype and 6 para types, USNM 62820. 



General: A small narrow, nonluminous lampyrid with no pronotal 

 infuscation and a transverse pink or red snbrectangular disc. 



Dimensions: Males 6.69 to 9.59 mm. long by 2.04 to 2.70 mm. 

 broad; average 7.83 by 2.31 mm. Females 6.87 to 9.03 mm. long 

 by 2.04 to 2.8 mm. broad; average 7.91 03^ 2.29 mm. 



Pronotum of males 1.28 to 1.66 mm. long by 1.58 to 2.24 mm. broad. 

 Females 1.33 to 1.63 mm. long by 1.66 to 2.37 mm. broad. Usually 

 widest in basal third or fourth. Apex slightly reflexed. Transverse 

 subrectangular rose-red area in basal two-thirds and median three- 

 fourths. No median vitta but frequently a narrow channel in basal 

 half. No infuscate marginal borders (one female had a very narrow 

 brown marginal line). Apical and lateral surfaces transparent, 

 coarsely punctulate. 



Scutellum black or dark brown. Mesonotal plates dull black or 

 dark brown. 



Elytra black (one male had narrow, pale, apical borders). Usually 

 bicostate. About 0.8 of total length in male, frequently short in 

 female, exposing 3 abdominal segments. 



Antennae black, compressed. Structure much as in the P. nigri- 

 pennis group. 



