62 THE BLATTIDAE OF PANAMA 



fully described, the specific diagnostic features of greatest value 

 can not be determined for brimneriana and in alhida are inad- 

 equately treated. 



The Mexican species is distinctly larger, with more elongate 

 tegmina and wings, than the species here described. The Colom- 

 bian species is apparently very close, though nothing of value is 

 stated for the genitalia, and we feel justified in describing the 

 Panamanian material as distinct, only because we have evidence 

 that the Impar Group splits up into an exceptional number of 

 species, each in distribution probably confined to a relatively 

 very limited area. 



Type. — cf; Gatun, Canal Zone, Panama. July 15 to 31, 1916. 

 (D. E. Harrower.) [Hebard Collection, Type no. 434.] 



Size medium for the group, similar to that of N. acanthastylata here described and 

 N. albida; form rather slender, as in those species. Interocular space relatively very 

 narrow, distinctly less than half as wide as that between antennal sockets; ocellar 

 spots small but distinct. Maxillary palpi and pronotum much as in acanthastylata. 

 Tegmina delicate; with (six sinistral, eight dextral) longitudinal discoidal sectors; 

 cross-veinlets heavy distad and in area of dextral tegmen concealed when at rest. 

 Wings delicate; proximal (seven) costal veins briefly but heavily clubbed distad; 

 ulnar vein with (three) complete branches; intercalated triangle small. Abdomen 

 with dorsal surface unspecialized. 



Supra-anal plate strongly transverse, weakly triangularly produced with apex 

 broadly rounded. Concealed genitalia: from below base of sinistral cercus a 

 moderately broad, flattened, cylindrical, chitinous process extends caudad, curving 

 dorso-dextrad, with distal portion slightly widened, rounded in outline, but armed 

 at apex with a spine curved strongly dextro-ventrad to its straight, aciculate apex 

 and below this armed with a similar spine curved ventrad. 



Subgenital plate weakly asymmetrical, due to a very slightly greater production 

 of the plate toward the sinistral style; weakly convex proximad, deplanate meso- 

 distad, with latero-distal portions moderately reflexed; lateral margins nearly 

 straight, subsinuate to apices of latero-distal reflexed portions, there sharply con- 

 vex-declivent in brief distance to medio-distal deplanate area, the distal margin of 

 which is moderately convex; styles situated in the angles thus formed, simple, 

 elongate, cylindrical, with apices rounded, each showing a feeble outward laterad 

 curvature and about four times as long as wide, in length each eciualling half the 

 distance between their bases. Limbs and their armament, pulvilli and arolia, as 

 given for acanthastylata. Tarsal claws specialized; internal flange well developed, 

 with (four to six) relatively decided but minutely microscopic teeth distad, show- 

 ing slightly greater specialization than in acanthastylata. 



