282 ^Fr. W. F. Kiiby on a 



beneath, rroiiotnni transvorst-ly striated, somewhat vu.2;ose 

 behiiul, tawny, with a large trapezoid ferruginous or blackish 

 blotch resting on the base ; this blotch is shaped nearly as 

 in Blabenis, but reversed, being broadest behind, where it 

 is sometimes marked with three tawny dots in a transverse 

 line ; in front this patch throws off two broad parallel brown 

 bands, separated by a tawny line Inoadest behind, nearly to the 

 front edge. There are also brown bands thrown out obliquely 

 forward to the margins from the front auglesof the main blotch, 

 and the pronotum behind is edged with brown along its lateral 

 and hinder margin ; the hinder margin, however, is narrowly 

 bordered by a yellow line, and the dark edging ceases before 

 reaching tlie dark blotch. The mesonotum and metanotum 

 are ferruginous, sometimes edged behind by a narrow yellow 

 line, and more or less varied with reddish; the middle of the 

 mesonotum is tawny, with a black si)ot on the front edge in 

 the middle. Abdomen ferruginous, with seven more or less 

 complete rows of tawny spots and most of the sixth segment 

 tawny; towards the margins the dark markings are blackish. 

 Cerci ferruginous, tipped with tawny. Legs above mostly 

 ferruginous, below mostly tawny. Abdomen beneath tawny, 

 with about live rows of darker markings more or less visible 

 in some of the specimens. 



6, Angola {Monteiro). 



Two in Mr. Distant's collection and four in the Natural 

 History Museum. 



Easily recognizable by the peculiar pattern of the pronotum. 

 The sexes differ little. 



Dorylcea rhombifolia. 



Blatta rhombifolia, StoU, Blatt. p. 5, pi. iii. d, fig. 13. 



Periplaneta rhombifolia, Sauss. M^ni. Soc. Geneve, xx. p. 260 (1869). 



Periplaneta hisirio, Sauss. Egt. Zoul. 1864, p. 3] 8; M(5m. Mex. Blatt. 



p. 73 (1864) ; Walk. Cat. Blatt. p. 130. n. 20 (1868). 

 Periplaneta decorata, Brunn. Syst. Blatt. p. 224 (1865). 

 Periplaneta heterospilu, Walk. Cat. Blatt., Suppl. p. 35 (1871). 



5, Fort Johnston, Nyasaland (Rendall) ; 1, Pemba Island 

 {Dista7it). 



First described from China. Common in the warmer parts 

 of Asia, Africa, and America. 



Periplaneta americana. 



Blatta americana, Linn. .Syst. Nat. (ed. x.) i. p. 424. n. 4 (1758). 

 Periplaneta americana, Brunn. Syst. Blatt. p. 232 (1865). 



1, Barberton ; 8, Pemba Island {Distant) ; 1, Fort John- 

 ston, Nyasaland [Rendall). 



