Mr. R. Shelford's Studies of the Blattid^. 259 



dark fuscous, mediastinal field at apex testaceous, fifteen costal 

 veins, discoidal field Avith nine longitudinal sectors, wings fuscous. 

 Abdomen, cerci and legs dark fuscous, coxae outwardly margined 

 with whitish. Supra-anal lamina quadrately produced. 



Total length 19 5 mm. ; length of tegmina 15 mm.'; pronotum 

 5 mm. X 6 mm. 



17. P. gueriniana, Sss. (Mexico.) 



Thyrsocera gueriniana, de Saussure, Rev. Zool. (2) xiv, 

 p. 168 (1862); Mem. Mex. Blatt. p. 124 (1864); 

 Miss. Mex. Orth. p. 50 (1870); Bmnner, I.e. p. 126, 

 n. 19 (1865). 



The type is in the Paris Museum. 



18. P. ohscura, Sss. (Bolivia, Santa Cruz.) 



Thyrsocera ohscura, de Saussure, Miss. Mex. Orth. p. 52 

 (1870). 



The type is in the Paris Museum. 



19. P. magna, n. sp. (ECUADOR, Paramba.) 



^. Entirely black, except a testaceous band on the antennse 

 beyond the basal incrassated portion and the testaceous terminal 

 three joints of the cerci which are not spatulate ; an orange patch in 

 the middle of the ventral surface of the abdomen. The borders of 

 the coxse are not white, and the mediastinal area of the tegmina 

 is not hyaline. Body depressed. Posterior border of prothorax 

 obtusely rounded. 5 . Like the male but without the orange patch 

 on the abdomen ; the supra-anal lamina is triangular, its apex 

 slightly incised. 



Total length. Length of body. Length of tegmina. 



^. 18 mm. 15-6 mm. 14 



9. 18 mm. 14 mm. 13-5 



One male and two females (JV. F. H. Posenherg coll. 

 February and May 1897). (Oxford Museum.) 



20. P. albostriata, n. sp. (Ecuador, Cachabi.) 



$ . Black ; antenme beyond the penicillation, with a testaceous 

 band occupying nine joints. Pronotum quite black except for a very 

 narrow border of testaceous, not occurring on the front margin ; the 



