42 Natural History Bulletin. 



linear, fine, reaching the base, not the apex, and crossed by a 

 straight, fine, Hnear sulcus, ending in a small, deep, pubescent, 

 lateral fovea, less than one-fourth the length from the base. 

 Elytra one-fifth longer than the prothorax, as long as the 

 width across the low-hanging shoulders, and three-fourths as 

 wide here as at the tip; disk depressed at the base, with four 

 foveas and three abbreviated discal Hues, of which the middle 

 one is longer, reaching the middle; the sutural lines are deep, 

 slightly arcuate, sculptured; the discal tubercles are smaller 

 than those on the head and prothorax. Abdomen slightly 

 wider than the elytra, convex, more so posteriorly, borders 

 strongly retuse, evenly arcuate toward the tip, transversely 

 depressed in the middle third at the base between short obso- 

 lete carinae, tubercles very minute. Legs slender; mesoster- 

 num bicarinate. 



Habitat. Middle California. 



R. canaliculatus, Lee. (Euplectus, Lee. Conoplectus, 

 Brend.^ Form compact, conoidal, tapering towards the head; 

 pubescence fine, dense; surface polished, punctulate; color, 

 pale brown. Length 1.2 mm. Plate XI, Fig. 10 1. 



Head broader than long, eyes not prominent, tempora con- 

 vergent, transverse, occiput canaliculate in the middle, convex 

 above, fove^e small, very near the eyes; circumambient sulcus 

 convergent for a short distance, thence parallel, connecting 

 with the corresponding one by a broad transverse impression; 

 frontal margin broad, divided by three fine, longitudinal, 

 grooves into five low tuberculations, the external one, — supra- 

 antennal — crossed by a short obHque cut; the median tuber- 

 culation (5) bears a very small acute tubercle. Under sur- 

 face behind the mentum densely pubescent with erect clubbed 

 hair. Antciince robust, one-half longer than the head, first and 

 second joints sub-equal, cylindrical, as long as wide; third to 

 eighth narrower, rounded, slightly transverse; ninth trans- 

 verse, twice as wide as long; tenth transversely oval, twice 

 as wide as the ninth, and one-half wider; eleventh ovate, 

 sHghtly wider than the tenth, and as long as the two preced- 



