334 CALANDEID^. [LeConte. 



flexed perpendicularly downwards; sculptured beneath with three longitu- 

 dinal grooves; antennal grooves very short; eyes transverse, coarsely granu- 

 lated, contiguous beneath, but widelj- distant above, and not extending to 

 the upper surface of the cranium. Antennse with scape reaching the eyes; 

 fuuicle 6-jointed, longer than the scape; club elongate-oval, as long as the 

 four preceding joints; spongy part as large as the corneous part, and sepa- 

 rated from it by angulated lines, so as to extend farther upon the sides than 

 upon the faces of the club, which is slightly compressed. 



Pro'.horax longer than wide, rounded on the sides, a little narrower at tip 

 than at base, and constricted; truncate before and behind. Scutellum small, 

 rounded. Elytra with shallow punctured striae, interspaces wide, sparsely 

 punctured; conjointly rounded at tip, pygidium slightly prominent. Legs 

 slender, thighs not clavate, tibi* subsinuate on the inner side, and feebly 

 serrate; especially the front pair; outer angle obtuse, indistinct, inner angle 

 strongly unguiculate; tarsi slender; third joint a little wider, bilobed, not 

 spongy beneath, but smooth and glabrous like the others. 



This genus differs from the two above named by the form of the antennal 

 club, by the eyes being widely distant above, and by the third tarsal joint 

 much smaller, not spongy beneath. 



1. Y. frontalis. Rhina frontalis Lee, Trans. Am. Ent. Soc 1874, 70. 



Mojave Desert, Cal.; under bark of Yucca; G. R. Crotch. Length 8- 

 11 mm.; .32-45 inch. I expressed my opinion when describing this 

 species, that it might indicate a distinct genus; but my knowledge oi EJiyn- 

 chophora at that time was not suflicient to enable me to properly define it. 



Subfamily IIL COSSONLD^. 



The abnormal form of mouth seen in the twb preceding subfamilies is 

 here replaced by the ordinary buccal cavity and mouth organs seen in 

 Curculionidm. The gular peduncle is rather broad, not very long, the 

 mentum and ligula with its paljii are distinct, and moderately large, and 

 the maxilUt and palpi are well developed. The beak varies greatly, being 

 sometimes rather long, and moderately slender, sometimes so short and 

 stout as to become indistinct. The antenna are inserted at a variable dis- 

 tance, being sometimes basal, sometimes nearly apical; the scape generally 

 extends beyond the eyes; the funicle has from four to seven joins; the club 

 is small, oval, partly corneous in some genera, and but feebly annulated. 

 The front coxae are sometimes widely separated, sometimes almost contigu- 

 ous. The thighs are unarmed, and the tibiaj are armed in our genera with 

 a long curved spine at the inner apical angle; the tarsi are variable, the 

 third joint is usually not broader; in one genus, Drt/opJithorua, by an ex- 

 ception otherwise unknown in the f\imily, and repeated again only in Platy- 

 pus and some other genera among the Scolytidm, the tarsi are disti;ictly 

 5-jointed. 



Neglecting the number of joints in the funicle of the antennae as being 

 rather of generic than tribal value, I would divide the few genera repre- 

 sented in our fauna as follows: 



