1921] NATURAL SCIENCES OF PHILADELPHIA, 237 



a series of decidedly heavy, elongate spines, which gradually de- 

 crease in length distad, terminating in spines which are elongate 

 in increasing ratio distad ; ventro-caudal margin in distal half with 

 (3 and 1 distal) heavy, elongate spines. Other femora with ventral 

 margins armed with numerous heavy, elongate spines, and with 

 very elongate genicular spines. Four proximal tarsal joints sup- 

 plied with large pul villi. Large aroHa present between the simple, 

 very weakly asymmetrical tarsal claws, 



Liosilpha pumicata (Stal) Plate X, figures 9 and 10. 



1860. Blatta pundcaia Stal, Kongl. Svenska Freg. Eugenie's Resa, Zool., 

 I, p. 309. [ cf ; Rio de Janeiro, [ Brazil ]. ] 



Tijuca, Rio de Janeiro, Brazil, 1 9 , [Hebard Cln.]. 



This specimen has the dorsal surface shining, clay color, except 

 for the lateral portions of the pronotum and marginal fields of the 

 tegmina, which are transparent, tinged with cinnamon-bufT. The 

 dorsal surface of the abdomen is suffused with bister laterad and 

 distad, leaving the lateral margins of the wider tergites cinnamon- 

 buff. The cerci and limbs are cinnamon-buff, the latter with very 

 small flecks of brown at the spine bases. The ventral surface of 

 the abdomen is more narrowly suffused with bister laterad, with a 

 large pale marginal spot on each sternite, the subgenital plate bis- 

 ter proximo-laterad and opposite the cerci, these latter suffusions 

 extending mesad and connecting, but very weak in median portion. 



Length of body 12, length of pronotum 4.3, width of pronotum 

 5.7, length of tegmen 10.8, width of tegmen 4, length of caudal femur 

 5.2 mm. 



LITOBLATTA new genus. 



This genus is erected to include the single species, "7sc/xwo/>tera" 

 hrasiliensis of Brunner. 



The males differ from those of Ischnoptera in being of a more de- 

 licate structure, wings with area between discoidal vein and anterior 

 margin broader, unspecialized dorsal surface of abdomen, transverse 

 supra-anal plate and cephalic femora with spines not distinctlj^ 

 biseriate. 



Females differ in having lobiform, lateral tegmina, sixth tergite 

 bluntly triangularly produced over the similarly produced supra- 

 anal plate and almost completely concealing the latter and cephalic 

 femora with spines even less appreciably biseriate than in males. 



The production caudad of a tergite, which almost entirely con- 

 ceals the supra-anal plate in the female sex, is a feature unknown 

 to us for any other species of the American Pseudomopinae. 



In linear arrangement we place this genus before Symvloce Hebard, 



