374 STUDIES IN THE ISCHNOPTERITES (oRTHOPTERA) 



Head broad, interocular space equal to that between the pale ocelli, ocellar 

 areas weakly defined. Tegmina extending to apices of cerci. \\'ings suffused 

 with brown, this decided between discoidal vein and costal margin. Ulnar 

 vein with 0-1 incomplete and 1-2 complete rami. Dorsal surface of abdomen 

 weakly modified: median segment with few minute, stout hairs in latero-proxi- 

 mal depressions; disto-lateral angles of proximal segments sUghtly acute pro- 

 duced, this increasing Very slightly to sixth segment; seventh segment almost 

 entirely concealed; eighth narrowlj^ visible but moderately angulato-produced 

 laterad and there comprehending base of supra-anal plate. Supra-anal plate 

 transverse, not strongly rotundato-trigonal produced between cerci, this por- 

 tion subchitinous and, like the cerci, supplied with a number of long slender 

 scattered hairs. Subgenital plate transverse, broadly deplanate mesad, con- 

 vex laterad; distal margin weakly and irregularly undulating, narrowly sub- 

 chitinous and supplied with slender hairs between the highly specialized styles. 

 Within, at this margin, beneath the sinistral cercus, a minute chitinous cone 

 projects caudad with acute apex directed dextrad, and adjacent dextrad a 

 second more slender but longer projection, with acute apex, is directed dextro- 

 dorsad (sinistral style). The dextral margin of the plate is produced dorsad 

 in a narrow shelf shghtly proximad of the dextral cercus, which is continued in 

 an elongate, weakly and irregularly undulating, mobile, cylindrical shaft, with 

 its rounded apex supplied with a few minute hairs, this shaft directed sinistrad 

 and extending along the distal margin of the plate to its mesal point. 



Measurements (in millimeters) 



d' 



Igarape Assu, Brazil 17 



■SB 



M W) 



4.2 



•- ft 



°B 



1G.4 4.8 



Only the male here discussed is before us. 



Xestoblatta carrikeri'-'- new species (Plate XIX, figs. 5, 6 and 7.) 



The present species is apparently nearest X. hamata, differing 

 from that species and from X. festae in the dorsal surface of the 

 male abdomen having the sixth^'^ segment specialized mesad and 

 its latero-caudal angles but weakly produced. The male geni- 

 talia, particularly the styles, are also very different from those 

 of festae and, as far as we can determine from the description, 

 very dissimilar also from those of hatnata. 



In the female the tegmina and wings are much more abbre- 

 viate than in hamata, the latero-caudal angles of the sixth seg- 



^2 We dedicate this species to the collector of the type, Mr. M. A. Carriker, 

 Jr., whose work in tropical America has been very extensive and fruitful. 



"' Ciglio-Tos, in his descrijition of hamata, gives this as the seventh segment, 

 evidently counting the median segment as the first. 



