KEVISION OF ELEODIINI BLAISDELL. 13 



termed the apical triangle. It is bounded above by the apical pro- 

 notal margin, within by the margin of the inlet, and below by a 

 feebly marked ridge that passes downward from the apex. The out- 

 let is circular and its plane is quite strongly oblique, while that of the 

 inlet is quite vertical. The dorsum is nearly twice as long as the 

 sternum. Ventrally along the margin of the outlet the surface is 

 rather widely impressed from side to side and behind the acetabula. 

 The impression is interrupted at the middle by the prosternal mucro, 



Pro'plevra' (prothoracic episterna and epimera) with parts not de- 

 fined from each other nor from the inflexed sides of the pronotum ; 

 limited internally before the acetabula by the prosternal suture; pos- 

 teriorly no sutures are visible. Surface more or less prominent from 

 the external margin of each acetabulum. 



ProsternuiYh with the coxae more or less protuberant ventrally. 

 Anterior margin broadly sinuate in circular arc, beaded, and usually 

 narrowly deflexed. Prosternal sutures distinct before the acetabula, 

 straight, impressed and subfoveate in basal half. Each suture ex- 

 tends from the external acetabular margin to lateral margin of the 

 prothoracic inlet, where it bounds the inner side of the apical triangle. 



Mesothorax. — Condyle annular. The dorsal part of the condyle 

 is formed by the transverse and somewhat triangular scutellum, the 

 apex entering between the elytral bases to appear visible as a small, 

 glabrous, and impunctate triangular plate, marked off from the 

 scutellar body by a strong surface deflexion, which is in line with a 

 similar deflexion across each elytral base, the condylar portion be- 

 ing on a lower plane than that which enters the elytral disk. The 

 condylar portion is minutely punctato-scabrous and finely pubescent, 

 its basal margin is feebly and broadly emarginate, with the angles 

 projecting a little beyond the episternal border, and at which point 

 the two plates are not closely articulated, being separated laterally 

 from the episterna by the articular processes of the elytra. 



Mesosterniim-. — It presents for examination two parts — a condylar 

 and an acetabular ])ortion. 



The condylar portion is directed horizontally forward, and arcuate 

 from side to side, forming apparently, when viewed from below in 

 reference to the greatest transverse diameter of the inlet, the middle 

 two-fourths ventrally of the condylar wall. The anterior or free 

 margin is beaded and feebly arcuate anteriorly. From the middle of 

 the margin there extends backward a short glabrous carina, which 

 is slighth' dilated where it is continuous with the marginal bead; 

 surface punctato-scabrous and finely pubescent. 



The acetahular portion is more or less declivous posteriorly from 

 the horizontal condylar part, the middle third posteriorly entering 

 between the mesacetabula forming the intercoxal salient of the me- 

 sosternum, where it may become briefly horizontal, and its apical 



