390 GENUS CROPHIUS 



Crophius leucocnemis Berg from Argentina and cos tat a and 

 dirupta Distant from Mexico and Guatemala are unknown to me 

 and are not included here. This paper therefore deals only with 

 the species from north of Mexico. 



Characters of genus Crophius. 



Form obovate, widest behind; head and thorax punctured, 

 the punctures coarser on the pronotum. Head convex, exclud- 

 ing the eyes as wide as the front of the pronotum ; sides parallel 

 before the eyes; antenniferous processes broad, armed with a 

 minute tooth exteriorly; tylus broad triangular, truncated at 

 apex, viewed from the side regularly arcuated; bucculae promi- 

 nent anteriorly, more slenderly reaching to near the base of the 

 head. Rostrum reaching to about the middle of the mesoster- 

 num, first joint nearly attaining the anterior line of the eyes, 

 second slightly surpassing the base of the head. Antennae 

 moderately stout, first joint equalling or generally surpassing the 

 tip of the tylus; second much longer and more slender; third 

 usually a little thicker than the second and about equal to the 

 first in length; fourth stout, fusiforn, usually as long as the 

 second or even longer. 



Pronotum trapezoidal, moderately convex, feebly constricted 

 at about the middle ; anterior margin about two thirds the length 

 of the posterior; callousities usually distinct. Prosternum with- 

 out a sulcus; meso- and metasternum distinctly sulcate; the 

 metasternal sulcus sometimes much broadened or almost obsolete. 

 Hind edge of the metapleura developed in a rounded lobe or flap 

 either side. Scutellum equilateral or nearly so, impressed near 

 the base ; the base much raised and usually covered by the hind 

 edge of the pronotum; the apex with a distinct carina. 



Elytra usually exceeding the abdomen, feebly convex; 

 broadest near the apex of the corium ; coarsely and sparsely 

 punctured ; costa more or less expanded, its margin nearly rec- 

 tilinear ; clavus with three fairly regular rows of punctures, those 

 of the sutural row finer; corium with prominent nervures, the 

 punctures scarcely forming lines ; costal margin usually impunc- 

 tate; membrane broadly rounded, the four nervures distinct 

 and nearly straight. Anterior femora moderately incrassated; 

 unispinose, sometimes with a few small teeth near the apex. 



