286 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Villa Lutecia, near San Ignacio, Misiones, Argentina, 1 cf . 

 On page 242 of the present paper we have compared T. conspersum 

 (Guerin and Percheron) with the present species. 



BLABERINAE. 

 Blaptica interior new species. Plate XIV, figure 1. 



This species is very closely related to B. duhia (Serville), differing 

 in the male sex in the more slender form, in the strikingly smaller 

 pronotum, with lateral portions of cephalic margins not weakly 

 reflexed and lateral margins broadly rounded, showing hardly a 

 trace of the angulation distinctly developed (though to varying 

 degrees) in duhia, and in the narrower interocular space. In ad- 

 dition the ventral surface is paler, that surface with subgneital plate 

 and sometimes the preceding segment alone solidly dark, while the 

 dark marking of the pronotal disk is truncate cephalad, ceasing 

 abruptly before the convex section above the head. 



Females of these species are very similar, those of interior being 

 less robust, with interval between the tegmina decidedly less. 



Type: cf ; Cordoba, Cordoba, Argentina. [Hebard Collection, 

 Type no. 672.] 



Size rather small for the genus, very small for the Blaberinae; 

 form slender for the genus. Interocular space narrower than in 

 duhia, one-third (varying in the series to two-fifths) as wide as the 

 interocellar space. Ocelli large and prominent, each with a cir- 

 cular and similarly subchitinous spot of about half the size immedi- 

 ately ventrad. Maxillary palpi with distal joint very sUghtly 

 longer than fourth. Pronotum with impressed lyrate pattern of 

 disk and convex area above head as in duhia, but differing decidedly 

 in the almost perfectly oval outline, without lateral angles and 

 weakly cingulate, but not moderately reflexed, lateral portions of 

 the cephalic margin. Tegmina elongate and narrow, with margins 

 parallel for a considerable distance; anal field ample and elongate, 

 as in duhia. Supra-anal plate broadly truncate, bilobate. Sub- 

 genital plate forming an asymmetrical lobe, with two very small, 

 simple styles. Ventro-cephalic margin of cephalic femora supplied 

 with a row of closely placed, moderately elongate, spiniform hairs, 

 terminating in a single large distal spine. "^ Other ventral femoral 

 margins (excepting in many paratj^pes the entirely unarmed ventro- 

 caudal of the caudal femora, and in this the normal condition in the 

 species) armed with a single large distal spine, the ventro-caudal 



"8 This condition is also found in duhia, but in that species frequent specimens 

 have one or more short, heavy, proximal spines and two heavy spines distad on 

 the ventro-cephalic margin of the cephalic femur. Variation in that species is 

 decided, as will possibly be found to be true for interior also. 



