MORGAN HEBARD 373 



armed with variously elongate, inflexed. mobile, chitinous styles.^^ 

 Limb armament as in Symploce but with spines heavier. Cephalic 

 femora with ventro-cephalic margins armed with heavy elongate 

 spines, which decrease gradually in length meso-distad and are 

 terminated by three longer (in increasing ratio) distal spines. 

 Other ventral margins of femora supplied with moderately nu- 

 merous heavy, elongate spines. Median and caudal femora, in 

 addition, supplied with a single heavy, elongate, genicular spine. 

 Small arolia are present. 



All of the species of this genus known to us are moderately 

 dark in coloration wdth pronotum and tegmina having a decided 

 gloss. But one species, nyctihoroides, has the pronotum dis- 

 tinctively colored; this insect is rather widely separated from 

 the others, all four of which are closely' related. 



The forms of the genus wall probably be found widely dis- 

 tributed from Costa Rica southward throughout the Amazon 

 Basin. 



Xestoblatta nyctihoroides (Rehn) (Plate XIX, figs. 1, 2, 3 and 4.) 



1906. Uclmoptcra )tijctU)oroides Rehn, Proc. Acad. Xat. Sci. Phila., 190(), 

 p. 266. [1 9 , Demcrara, British Guiana.] 



A specimen before us of the male sex agrees fully with the orig- 

 inal description and color diagnosis, but is apparently somewhat 

 darker. The insect is distinctive in coloration; the head and 

 pronotum being solid shining blackish brown with a chestnut 

 tinge, the pronotum narrowly margined laterad with ochraceous 

 buff, this continued around the cephalic margin as a narrow 

 thread of the same color. The tegmina are rich and shining 

 russet, except the marginal fields which are ochraceous buff and 

 the portion of the dextral tegmen concealed when at rest, which 

 is less polished and shows, in some lights, a metallic purplish 

 lustre along its inner margin (structural color). 



As the male was previously unknown the following characters 

 are here given. 



(f ; Igarapc Assu, Para, iira/.ii. .January 23, 1912. (H. S. Parish.) [A. N. 



s. P.! 



'■' Consequentl}', as the styles, when at rest, are directed across the inner 

 surface of tlie plate at the distal margin, they are almost entirely concealed 

 from below, and the plate's convex exterior would lead one, on hurried exam- 

 ination, to mistake the sex. 



TKAXS. AM. KNT. SOC, XLII. 



