101 



rotundate behind. Elytra and wings perfect, rarely abbreviate. 

 Legs long, slender, very spinose. Tarsi compressed laterally, 

 first joint longer than all the following ones together. Supra- 

 anal lamina of male emarginate or lohnte. Cerci pilose, distinctly 

 acuminate, twice as long as the lamina." 



Although adopting for the present the genus as defined above, 

 it seems to me that its limits are drawn too far, and that the 

 species possessing only lobiform elytra, that is, such not much 

 exceeding the mesonotum and comparatively short cerci, might 

 adv^antageously be united under another generic or subgeneric 

 designation. 



A. Elytra abbreviated, iviii'js rudimentary. 



Periplaneta orientalis, Linne. 



Fauna Suec. n., 862 ; Br., Syst., 226. 



Blatta, L., 1745, ifec. ; Kakerlac, Serv., Hist. Nat. Orth. ; 

 Stylopuyga, Scdd. 



" Brownish-ferruginous to chestnut Elytra of male not 

 attaining the apex of abdomen, truncate ; of female slightly ex- 

 ceeding the mesonotum, lateral. Wings shorter than elytra in 

 both sexes. Supra-anal lamina of male transverse, hindmargin 

 membranous ; of female compressed, triangularly excised. 



Length of body 



Length of elytra .. 



Length of pronotum 



Width of pronotum 

 Habitat. — All parts of the inhabited surface of the earth. In 

 the collection of the S.A. Museum are specimens from Adelaide, 

 Jamestown, Northern Territory, and Japan. The young larvse 

 are brownish-red, the older almost black ; hence the name of 

 "Black Beetles." 



Periplanata rufa, sjiec. nor. 

 Red, smooth, shining. Head pale-i"eddish, ocelliform spots 

 yellow ; base of antenna? and sides of face pale reddish-yellow ; 

 mandibles and palpi partly blackish. Antennae as long as the 

 body, dull ferruginous. Pronotum smooth, very shining, semi- 

 circular, convex. Elytra abbreviated, attaining to the hind- 

 margin of secijnd abdominal segment, very broad, apex rounded, 

 remainder oblique, concave ; veins distinct. Coxa? pale ; tarsi 

 dilated beneath, forming very thin lamina. Abdomen with the 

 segments angular, six and seven dull dark-brownish, liindmargins 

 of all narrowly rugose, with many minute sulci ; lobes of segment 

 €ight prominent, triangular. Supra-anal lamina of male entire, 

 rounded. Cerci about three times longer than lamina, acute, 



