DESCRIPTIONS OF NEW SPECIES. 189 



front coxal cavities are entirely closed ; in the $ the 3d and 4th 

 joints are as stout as the 1st, and the 5th is less enlarged. The 

 4th joint is shorter than the 3d in both sexes, but is as long as 

 the 5th. 



503. C. quadriplagiata. Piceo-castanea, subtilissime cinereo 

 pubescens, protboracelmpunctato, latitudine plus duplo lougiore, callo 

 angusto ad medium elevate, disco utrinque magis convexo et ante 

 basin bituberculato ; elytris parce punctatis, punctisque majoribus 

 raris interrnixtis, macula utrinque pallida quadrata ante medium, 

 alteraqne pone medium ornatis; antennis flavo-testaceis, basi castaneis. 

 Long. 10 mm. 



One 9 ; Cape San Lucas, Lower California ; the dorsal callus 

 of the prothorax is narrow, short, and carinated ; the disk each 

 side is more convex, but scarcely gibbous ; near the base on each 

 side is seen an elevated tubercle. The larger punctures of 

 the elytra in this and the preceding support flying hairs, which 

 are not however very long or as conspicuous as in the polished 

 species of Heterachthes. 



PL.ECTROMERUS LEO. 



I have adopted this unpublished name of Dejean for Callidium 

 dentipes Oliv.; (Curius scambus Newm.). It is fully described 

 by Lacordaire, 1. c. viii. 352, as Curius ; the type of the genus 

 C. dentatus (concinnatus Hald.) not having been seen by him ; 

 he has mentioned the differences in a note, and they are chiefly as 

 follows 



Body depressed, opaque in Curius, cylindrical and polished 

 in Plectromerus ; prothorax rounded on the sides in the first, 

 nearly straight in the second ; 4th joint of antennae a little shorter 

 than the 5th in the first, very much shorter in the second. The 

 thighs are pedunculated, and suddenly clavate in Plectromerus, 

 and the tooth is much larger than in Curius, in which they are 

 more gradually dilated. 



CAIXIMUS MULS. 



504. C. chalylMBUS. Viridi-cyaneus, nitidus, protborace latitudine 

 longiore, parce punctato, lateribus late rotundatis, convexo postice paulo 

 angustiore et constricto ; elytris parallelis apice rotuudatis, parce punc- 

 tatis et pallide pubescentibus ; femoribua anticis, vel ferrugineis, vel 

 cyaneis. Long. 6 mm. 



