DERODONTIDAE, If)? 



(). Antennse witli three t-nlarged joints. Lathridius. 



Antennae with two enlarged joints. Coninomus. 



7. Tarsi simple. Coiticaria. 



Tarsi with 1st joint large, oval patelliform. Monoedus. 



To Bonvouloiria belongs the California Lathridius parviccjjK 

 Lee* A species of Iloloparaniecus was found at Fort Yuma, 

 (California. The other genera are represented on- both sides of 

 the continent. 



Fam. XXXIV.— derodontidae. 



Mcntum small, trapezoidal; ligula corneous, with distinct 

 |)aragloss£e ; labial palpi 3-jointed, with the last joint oval. 



Maxilke exposed at the base; inner lobe corneous, hooked 

 at the end, and ciliate near the tip; outer lobe equal in size, 

 ciliate at tip; maxillary palpi 4:-jointed, cylindrical, last joint 

 eloucrate-oval. 



Head suddenl}^ but not strongly constricted behind; eyes 

 small, rounded, prominent, finely granulated; labrum trans- 

 verse, rounded, separated from the front by a transverse 

 membranous epistoma; mandibles short, curved, acute, with 

 a tooth very near the apex. 



Antenna3 inserted before the eyes, upon the sides of the 

 front, 11-jointed, first and second joints thicker than the fol- 

 lowing, 9-11 not suddenly somewhat larger. 



Prothorax "vvith the side pieces not separate, the margin 

 strongly toothed in Derodontxis^ broadly flattened and re- 

 tlexcd in Peltasiica ; coxal cavities confluent, closed behind. 



Mesostcrjiura short, scarcely separating the middle coxas; 

 side pieces diagonally divided. 



Mctasternum large, side pieces narrow. 



Elytra entirely covering the abdomen, with ten rows of 

 large quadrate punctures, besides a marginal series and a 

 short one near tlie scutellum. 



Abdomen with five free equal ventral segments. 



CoxiB, anterior, transverse, conical, prominent, contiguous; 

 middle, oval, oblique, slightly prominent ; posterior, trans- 

 verse, slightly separated, dilated internally, forming a small 

 plate, which protects the insertion of the thigh. 



Legs moderate; tibifn not dilated, with small terminal 

 spurs; tarsi o-jointed, clothed beneath with long hairs, the 

 fourth joint somewhat smaller than the preceding; claws 

 simple, 



* I'roe. Acad. >'at. rici., vii. :504. 



