236 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



This genus, erected to include Blatta puviicata St§,l, adspersi- 

 collis Stal'"' and dilatata Saussure," was restricted to the first species 

 by Kirby 's genotypic designation in 1904^^ and briefly diagnosed by 

 Shelf ord in 191 P\ 



A specimen of the genotype now before us, enables us to place the 

 genus definitely as an aberrant member of the Group Blattellae, 

 its broad form and moderately reduced organs of flight giving a 

 rather close general resemblance to the actually very widely separ- 

 ated Old World genus Allacta.^* 



We find Liosilpha to be a distinctive genus, showing no close re- 

 lationships, but best placed on linear arrangement after Blattella 

 Caudell. In heaviness of limb armament, convergence toward 

 the normal in the Blattinae is shown, but the ensemble of characters 

 clearly demonstrates the proper assignment to be that indie ated 

 above. 



The following generic characters are shown by the female before 

 us. Size medium large for the group, form very broad, structure 

 not as delicate as is usual in the group. Interocular space broad 

 (slightly narrower than that between the antennal sockets), ocellar 

 spots ample but weakly defined. Lateral margins of cheeks weakly 

 convergent ventrad. Maxillary palpi moderately elongate, (fourth 

 joint intermediate in length between third and fifth, the latter 

 with greatest width mesad). Pronotum broad, weakly convex, 

 becoming decidedly convex laterad, caudal margin broadly truncate. 

 Tegmina showing some reduction (extending nearly to the cereal 

 apices in the specimen at hand), moderately corneous, except in 

 area of dextral tegmen concealed when at rest, with veins not dis- 

 tinguishable unless held up to the light, anal sulcus finely impressed, 

 delimiting the elongate-pyriform anal field, discoidal sectors (6 to 

 8) longitudinal." Wings showing moderate reduction, the vena- 

 tion slightly irregular, (8) costal veins weakly clubbed, median 

 vein (once or twice) forked, ulnar vein with (2 -'') complete branches, 

 intercalated triangle very weakly developed. Supra-anal plate 

 with apex rather deepl}^ V-emarginate. Subgenital plate simple, 

 short. Cephalic femora with ventro-cephalic margin armed with 



^^ Genotype of Neoblatiella. 



^' Belonging to the genus Laiiblattella. 



^-' Syn. Cat. Orth., I, p. 96. 



*»Ent. Mo. Mag., (2), XXII, p. 156. 



^^ Our statement in 1907, that we did not beheve this species to be a member 

 of this group, was due to the fact that, without material for study, the characters 

 as far as described seemed to indicate other association. 



^^ We are at a loss to explain Shelford 's characterization of these veins as 

 oblique. He apparently had material of pumicata before him, as his comments 

 on the genus agree in all other respects. 



^^ One of these again branches. 



