242 



half usually triangular; sides sloped obliquely; apex pointed, advanced upon 

 the elytra, tricarinate, more or less denticulate. Elytra usually longer than 

 the abdomen ; wings same length. Sub-anal plate of the male large, convex, 

 unicarinate in the middle, terminated in a point. The posterior legs long; 

 femora but moderately swollen ; the posterior tibiae have the external row of 

 spines much smaller than the internal row. The tarsi have the terminal 

 joint as long or longer than the other two united. Prbsternum armed with a 

 straight and sharp point. This genus has two divisions: 



Division 1. — The j}ronoiU7n with three distinct carincE^ denticulate, and the 

 apex pointed a'nd advanced upon the elytra. 



Division 2. — Pronotum ivlthout apparent carincK ; apex not adr^anced upon 

 the elytra. (Saussure). 



X. py^iura, Sauss, Rev. et Mag. Zool., XIII (1861), 156. 



Small, fuscous, much compressed. Face deflexed, quadricarinate; inter- 

 mediate pair parallel, coarctate in the middle. Rostrum of the vertex sub- 

 elongate, rounded at the tip, sub-bicarinate, and carinated on the margin. 

 Antennee iiliform, prismatic, long as the head and pronotum. Eyes inflated, 

 approaching at the vertex. Pi-onotum carinated, margins parallel, not acute, 

 rugose; carinse thrice interrupted; posterior margin abbreviated, rounded. 

 Elytra longer than the abdomen, rounded at the apex ; fuscous-brown, punc- 

 tate, pale on the posterior margins; wings fuscous, yellowish at the base. 

 Body fuscous, with a yellow fascia on the sides. Posterior femora fasciate; 

 internal surface red ; tibiae red. 



Length of the body, 0.68 inch. 



Mexico (Saussure). 



X, iBiclaa-af a, Walk , Cat. Dermap. Salt., Ill, .523. 



Male. — Ferruginous, thinly pilose. Head and pronotum with two 

 blackish stripes. Head in front of the eyes elongate-conical, slightly acute; 

 under side slightly tuberculate, with two approximate keels. Eyes elongate- 

 elliptical, transverse, prominent. Antenna piceous, flat, tapering, slightly 

 dilated, longer than the pronotum. Thorax and hind iemora with black 

 tubercles. Pronotum with an indistinct oblique keel on each side, and a 

 slight crest ; crest yellow, with three notches, forked on the fore border ; hind 

 border elongated and rounded. Prosternuni with an acute and erect spine. 

 Hind iemora diintatc Ijeneath along the inner keel ; outer side with angular 



