1971] 
Roth — Blattaria 
85 
Fig. 1. Male genitalia of Nauphoeta cinerea (Olivier) (dorsal view). 
Ll =: first sclerite of left phallomere; L2vm = median sclerite of left 
phallomere (L2 ventromedial) ; L2d = dorsal sclerite of L2 ; R2 — hooked 
sclerite of right phallomere ; ret — retractable portion of R2 which lies 
in a membranous sheath. 
(Natural History), London; (CSIRO) = Division of Entomology, 
CSIRO, Canberra, Australia; (CUZM) = Copenhagen Univer- 
sity, Zoological Museum, Denmark; (L) = Zoological Institute, 
Lund, Sweden; (N) = U. S. Army Natick Labs., Natick, Mass.; 
(USNM) = United States National Museum, Washington, D. C. 
The number preceding the abbreviations refers to the number 
assigned the specimen and its corresponding genitalia (on a slide) 
which are deposited in their respective museums. 
Results and Discussions 
Princis (1961, p. 444) used the male subgenital plate as his final 
key character in distinguishing the Oxyhaloidae. This plate has a 
laterally directed recurved pointed projection posterior to each stylus 
(Figs. 2-5; arrows in 3). McKittrick (1964, p. 45) suggested that 
this shape may be the closest to the ancestral type and that all other 
shapes of subgenital plates in the Blaberidae could be derived from 
it by differential reduction. The subgenital plate is an excellent 
character for distinguishing Oxyhaloinae because the internal geni- 
talia (Fig. 1 ) of the 8 genera used in this study are all basically 
similar. The L2d is separated from L2vm, and is a sclerotized plate 
