138 GEO. IT. HORN, M. D. 



rate, angles rectangular. Eyes distant from prothorax, slightly oval 

 and oblique. Antennae inserted between the eyes and anterior mar- 

 gin of front, slender, filiform, eleven-jointed, joints equal, second, joint 

 one-half the length of the others. Head not narrowed behind the 

 eyes, vertical in front, prolonged in a transversely compressed muzzle. 

 Prothorax subcylindrical, sides slightly rounded anteriorly. Elytra 

 elongate oval. Legs slender, tibife bispinose, tarsi pubescent beneath, 

 first joint longer, penultimate sub-bilobed. Five abdominal segments 

 in both sexes, the terminal conical in male, broader in female. 



This genus of Oedemeridaj supplies in our fauna the place of Chi- 

 tona in the European. Differing from Chitona in the entire mandibles, 

 the form of mentum, form and situation of the eyes. I regret not be- 

 ing able to give more extended comparisons, having no specimens at 

 my disposal of the European species. 



R. rufioollis, ceneous-black, thorax rufous. Head glossy, sparsely and finely 

 punctuieil and sjiarsely clothed with cinereous pubescence. Thorax one-half 

 longer in 9 > or in*^ twice as long as broad, subcylindrical, conves, sides feebly 

 rounded ; shining, very sparsely punctured and very sparsely pubescent. Ely- 

 tra elongate oval, humeri obtuse, more than twice as long as broad, rather 

 coarsely and densely 2)unctured and more densely clothed with recumbent ci- 

 nereous pubescence. Abdomen and legs black, clothed with cinereous pubes- 

 cence. Length .24 — .36 inch. 



Owen's Valley, California, on flowers. 



The thorax is very variable in form in this species, generally much 

 longer in the males and more robust in the females. In the majority 

 of specimens it seems broader at base than at ypex, and has the sides 

 feebly sinuate behind. 



PKOSTENUS Latr. 

 P. californicus, elongate, shining, cupreous or violaceous metallic; head 

 coarsely punctured, thorax one-third broader than long, moderately convex, 

 coarsely punctured, sides strongly rounded in front, rather suddenly narrowed 

 at the posterior third, apex feebly emarginate, base broadly rounded, hind an- 

 gles distinct. Elytra elongate-oval, truncate at base, humeri obtuse, sides mod- 

 erately rounded, gradually narrowing at posterior third, with striee of rather 

 coarse punctures, rather distantly placed, and an intermediate series of finer, 

 very closely placed, ^junctures. Beneath metallic -blue, coarsely punctured. 

 Length .40 inch. 



Two much injured specimens from Martinez, California. 



The occurrence of this genus so high up in California, gives rise to 

 some doubts as to whether they may not have been imported. They 

 were sent to me as collected, the bottle containing very little else of 

 value, and nothing else of a foreign type. I have therefore described 

 the species, and await the time when I shall be able to compare it 

 with others already known. 



