238 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



as the first of the known genera of the Ischnopterae having the 

 cephaUc femoral spine armament of the uniseriate type. 



Generic Description. Structure of males very delicate, of females 

 strongly chitinous. Head elongate, ocelli distinct; flat surfaces of 

 ocellar areas forming a rather sharp angle with the interocellar space 

 in males, this area much reduced and less distinctly defined in fe- 

 males. Pronotum of male moderatly convex, with oblique sulci 

 present and caudal margin very weakly and broadly convex; of 

 female more decidedly and evenly convex, with caudal margin 

 truncate and showing scarcely any convexity. Tegmina of male 

 fully developed, with discoidal sectors weakly radiating; of female 

 represented by coriaceous lateral pads. Wings of male with area 

 between discoidal vein and anterior margin moderately broad; 

 mediastine vein extending more than half the distance to apex of 

 wing, from which spring a number of the costal veins, none of the 

 costal veins enlarged distad; discoidal vein branching, the forks 

 dividing toward apex of wing; ulnar vein almost straight, with in- 

 complete and complete branches; intercalated triangle small and 

 inconspicuous. Wings absent in female. Dorsal surface of male 

 abdomen unspecialized. Supra-anal plate of male transverse. Fe- 

 male with sixth tergite (PI. X, fig. 17A) bluntly triangularly pro- 

 oduced over the similarly produced supra-anal plate (PI. X, fig. 

 17B) and almost completeley concaling the latter. Cephalic femora 

 with ventro-cephalic margin armed with heavy elongate spines, 

 which decrease strongly but irregularly in size distad,^' terminating 

 in three heavy and elongate spines, elongate in increasing ratio dis- 

 tad. Very small distal pul villi present on four proximal tarsal joints 

 in males, absent in females. Small aroha present between the elon- 

 gate, slender, simple, symmetrical tarsal claws. 



Litoblatta brasiliensis (Brunner) Plate X, figures 14, 15, 16 and 17. 



1865. I[schnoptcra\ brasiliensis Brunner, Nouv. Syst. Blatt., p. 130, pi. Ill, 



fig. 12. [c?, Brazil.] 

 1897. L[oboptera] laurenziana Giglio-Tos, Bull. Mus. Zool. Anat. comp. 



Univ. Torino, XII, No. 302, p. 2. [ 9 ; San Lorenzo, Jujuy and Tala. 



Salta, Argentina.] 



Passa-Quatro, Rio Las Pedras, Minas Geraes, Brazil, 1000 meters, 



I c^. 



The description shows that Giglio-Tos failed to associate the sexes 

 of hrasiliensis, erecting the synonymous Loboptera laurenziana, 

 based on the female sex of the species. 



^^ In males of brasiliensis this series may be called uniseriate only because the 

 transition from the heavy elongate proximal spines to the small, but not piliform, 

 distal spines is irregular and not abrupt. In some males a number of the more 

 distal spines, being smallest and of subequal size, might lead one to term the spine 

 armament of this margin biseriate. 



In the females the decrease averages less but shows similar individual varia- 

 bility. 



