BY ARTHUR M. LEA. 453 



b. Forehead sinuous. 



c. Forehead trisinuate, scutellum absent.... Pseudonidistus. 

 cc. Forehead quadrisinuate, scutellum pre- 

 sent Onidistus. 



bb. Forehead not sinuous. 



d. Apex of rostrum not resting in a special 



receptacle Cycloporopterds. 



dd. Apex so resting Poropterinus. 



BB. Mesosternal receptacle cavernous (some- 

 times just perceptibly so). 



C. Tarsi linear Scolyphrus. 



CC. Tarsi with third joiut wider than second 

 (sometimes not by much) and bilobed. 

 D. Inner projection of metasternal episterna 



large, triangular, and isolated Cedilaus. 



DD. Inner projection not as in D. 

 E. Scutellum present, 

 e. Head convex, forehead not sinuous. 

 f. Femora dentate. 



g. Eyes coarsely faceted Anilaus. 



gg. Eyes finely or moderately faceted. 

 h. Suture between two basal seg- 

 ments of abdomen curved. Ouroporopterus. 



hh. This suture straight Omydaus. 



ff. Femora edentate. 



i. Eyes finely faceted Pteroporopterus. 



ii. Eyes coarsely faceted. 

 j. Metasternal episterna not trace- 

 able EXITHIOIDES. 



jj. Metasternal episterna traceable 

 throughout. 

 k. Prothorax longer than wide.... Pseudomydads. 

 hh. Prothorax transverse. 



I. Elytra trisinuate at base Orthoporopterus. 



II. Elytra not trisinuate Poropterculus. 



ce. Head depressed at base, the forehead 



usually sinuous. 



m. Club decidedly elongate Austrectopsis. 



mm. Club sometimes moderately long, 

 but never very long. 

 n. Suture between two basal segments 

 of abdomen more or less indistinct. 

 o. Metasternal episterna not trace- 

 able throughout ExiTHlUS. 



