42 NATURAL History BULLETIN. 
linear, fine, reaching the base, not the apex, and crossed by a 
straight, fine, linear sulcus, ending in a small, deep, pubescent, 
lateral fovea, less than one-fourth the length from the base. 
Eilytra 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 
fovez and three abbreviated discal lines, 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. <Addomen 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 carine, tubercles very minute. Legs slender; mesoster-_ 
num bicarinate. 
Habitat. Middle California. 
R. CANALICULATUS, Lec. (Euplectus, Zec. 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. ror. 
Hlead broader than long, eyes not prominent, tempora con- 
vergent, transverse, occiput canaliculate in the middle, convex 
above, foveze 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 oblique cut; the median tuber- 
culation (4) bears a very small acute tubercle. Under sur- 
face behind the mentum densely pubescent with erect clubbed 
hair. Antenne 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, 
slightly wider than the tenth, and as long as the two preced- 
