new f>/>ecies of I'lattidio. 35 



Total lciij;tli 11 -5 mm. ; lenj;th oC body [) mm. ; Icnj^th of 

 tegmina 912 mm. 



Maroui, French Guiana {F. Geatj, 1903) ; one example 

 (Paris Mnscum). 



P. histrio, Sauss., a])pears to be tlie nearest ally of this 

 speeies, wliicli is will marked l)y tlie dark tegmiiia with one 

 hyaline band. 



Uenus PsEUDECToHU, Sauss. 



l^seudectobia Alluaudi, sp. n. 



? . Rufo-testaceoiis. Antenuje and mouth-parts testa- 

 ceous. Prouotum covering vertex of head, trapezoidal ; 

 anterior margin truncate, posterior margin obtusely angled, 

 lateral margins pellucid, with an opaque testaceous sub- 

 marginal band bordered inwardly by a rufous suffusion. 

 Tegraina convex, nitid, venation of anal and discoidal fields 

 obsolete ; anal vein deeply impressed, arcuate, reaching 

 sutural margin at a point on one half o£ its length ; fifteen 

 costals. "Wings small, Iiyaline; radial vein bifurcated near 

 its apex ; twelve costal veins; ulnar vein triramose; apical 

 triangle well defined, projecting beyond the anterior margin. 

 Al)domen broad ; supra-anal lamina triangular ; subgenital 

 lamina semiorbicular, projecting slightly beyond the supra- 

 anal lamina. Front femora with eleven spines along the 

 anterior margin beneath ; hind femora with four pairs of 

 spines; genicular spines and a pair of apical spines on each 

 femur. 



Total length 10 mm. ; length of tegmina 7 mm. ; pro- 

 uotum 3x 5 mm. 



Diego Suarez, Madagascar {AUuaud, April 1896) ; one 

 example (Paris Museum). 



De Saussure created this genus or subgenus for the recep- 

 tion of the species Lunel'i, Sauss., Uturifera, Stal, iusularis, 

 Sauss., regarding the apical triangle and branched ulnar 

 vein of the wings of prime importance. As I have showai 

 (Trans. Ent. Soc. London, p. 231, 1906), the presence of an 

 apical triangle in the wings is a feature that appears in so 

 many subfamilies of Blattidae, that, taken by itself, it is of 

 small value for purposes of generic distinction. I do not 

 believe that liliirifera, Stfd, and msularis, Sauss., are con- 

 generic, and 1 have seen the types of both species; Lwie/i, 

 Sauss., is congeneric with Uturifera, Stal, and I do iiot see 

 how either species can be separated from the genus P/njllu- 

 ilruinia ; insularis, Sauss., is a broad convex insect, very 



3* 



