146 PROCEEDINGS OF THE NATIONAL MUSEUM 



Pyractonema Itaemorrhoa (Fairmaire ami Germain) 



Figure 5 



Lucidota haemorrhoa Fairmaire and Germain, Coleop. Chilensia, vol. 2, p. 2, 

 1862. 



Material: About 180 specimens of the typical variety, including 19 

 females. One pair in copulation. None of these specimens was as 

 small as 10 mm. long, as given in the original description, and the 

 majority were 13 or more mm. long. Also, 20 shorter and more oval 

 specimens, including 6 females, which are described separately below. 

 108 specimens in the collection of the California Academy of Sciences, 

 including intermediate forms. 



General: A medium to large size nonluminous lampyrid, with the 

 apical ventral abdominal segment red, rarely yellow or white. 



Typical form: Dimensions: Males 13.8 to 18.9 mm. long by 4.1 

 to 6.1 mm. broad; average 16.65 by 5.25 mm. Females 12.0 to 18.5 

 mm. long by 4.6 to 6.85 mm. broad; average 16.8 by 6.05 mm. 



Pronotum black with two longitudinal subrectangular red areas 

 usually with yellow lateral borders, occupying about 0.3 or more of the 

 total surface, sometimes less in the females. Reflexed laterally and 

 slightly so apically. About 0.7 to 0.75 as long as wide, proportionately 

 slightly wider in the females. Approximately semicircular in outline, 

 slightly prominent apically. 



Scutellum and mesonotal plates black. 



Elytra black, usually tricostate. Explanate margins narrow. 

 About 0.75 to 0.8 of total length. In the male, the elytra are at least 

 as long as the abdomen. In the female, segment 8 and sometimes 7 

 are exposed. 



Head black, not markedly bulbous between the antennal sockets. 

 Ctypeus short, black, semicircular. 



Antennae black, compressed. Articles 4, 5, and 6 may be widest, 

 but usually 4 to 10 subequal. About 0.5 to 0.6 of body length in males, 

 0.4 to 0.5 in females. 



Tergites all black, except that the red last ventral segment shows 

 through the pygidium; the latter medially emarginate, longer, and 

 nearly as wide as segment 7 in male, triangular in female. 



Ventral segments 2 to 7 black, 8 almost entirely red, rarely yellow 

 or white, but may have a black apical margin or lateral angles. Me- 

 dially emarginate in male. A prominent "pore" on each rudimentary 

 luminous organ. In female, segment 8 triangular, apically V-notched. 



Legs black, compressed. Tibial spurs very inconspicuous. Claws 

 not spurred, but may have a short "thumb" at base. 



Aedeagus as in figure 5. 



