306 BULLETIN fi3, TTNTTED STATES NATIONAL MUSEUM. 



Fissure narrower, otherwise as in rentricosa. One of the speci- 

 mens from El Paso, Texas, has the apical margin of the dorsal plate 

 as in ventrwosa . 



Hahitat. — Texas {¥A Paso, March. H. Soltau: Fort Bliss, collection 

 ofH. C. Fall). 



Number of siDecimens studied, 3 (1 male and 2 females). 



Co-types distributed as follow^s: Male in the collection of H. C. 

 Fall ; female types in the collection of the U. S. National Museum. 



Tyjje-locality. — Texas (El Paso and Fort Bliss). 



Diagnostic characters. — Falli is separated from ventricosa by the 

 less transverse prothorax, the very acute, anteriorly prominent, and 

 more or less reflexed apical angles of the same; the basal angles are 

 distinctly obtuse and not rounded ; the elytra are much less inflated, 

 and consequently appear more elongate, and the cauda in the male is 

 longer. 



From lura- forma infata it is recognized l)y the more strongly de- 

 veloped apical angles of the prothorax, the oblique cauda of the male, 

 and the mutic anterior femora of the female. 



From tenuipes^ which it approaches, it is quickly recognized by the 

 Avell-developed anterior prothoracic angles; the cauda in tenvipcs is 

 slightly oblique at times, but more horizontal in wickhami. Tenuipes 

 is less inflated and therefore narrower and more elongate. 



Falli is undoul)tedly intermediate between te)n(ipe>< and renfrlrosa, 

 and differs with the latter from all other members of the subgenus 

 by the character of the vestiture of the anterior tarsi and the mutic 

 anterior femora in the female. 



General characters. — The mentum is exactl}' as in ventHcosa., and 

 the prosternum is more or less rounded behind and feebly mucronate. 

 The mesostermum is as in ventricosa. 



The relative size of the metasternal and abdominal salients are the 

 same as in centricosa. 



The post-coxal portion of the first segment is a little longer than 

 the ]>rocess and quite equal to the third in length; the second is about 

 a fourth of its length longer than the third, the latter being about 

 twice as long as the foui'th. 



The metasternum laterally and the femora are as in rcntricosa. 



The protibia3 are more or less distinctly carinate externally, and 

 the articular cavities are more or less open: the tarsal sulci are (piite 

 well developed, as they also are on the mesotibia\ 



Otherwise the tibise and the tarsi are relativelv as in rentricosa. 



Subgenus BLAPYLIS Horn. 



The present subgenus is based chielly upon the character of tarsal 

 Ijubescence. The males have two or three basal joints of the anterior 



