AMERICAN COLEOPTERA. 145 



The entire upper surface is of uniform color and under a high 

 power is seen to be finely alutaceous. The species recalls the form in 

 miniature of some Australian species of Hydroporomorplia. The 

 generic characters are those of Limnebius with the exceptions indi- 

 cated. The presence of an eighth abdominal segment is a very un- 

 usual character and created some doubts in my mind at first as to the 

 correctness of the determination, but under the compound microscope 

 the last two segments are very plainly seen. 



One specimen in my cabinet from a pool of water on the mountains 

 south of Fort Crook, California. 



UEPTINUS, Mailer. 

 Ij. valiiliis. n. sp. — Broadly oval, depressed, testaceous, feebly shining, 

 sparsely clothed with short yellowish pubescence. Head broader than long, 

 densely punctured, frontal margin thicker, shining, 

 and slightly reflexed. Antennae testaceous, longer than, 

 head and thorax. Thorax nearly twice as wide at base 

 as long, apex emarginate and nearly as wide as the 

 length, sides strongly arcuate at basal angless, lightly 

 narrowed, base broadly emarginate, surface densely 

 punctured. Scutellurn broader than long. Elytra at 

 base slightly narrower than thorax, sides feebly % , or broadly arcuate 9 , as 

 long as head and thorax; surface depressed, densely punctured with a tend- 

 ency to become transversely strigose. Body beneath testaceous, more shining 

 than above, less densely punctured and pubescent. Length .20 inch; 5 mm. 



Two specimens are before me which, from their dissimilarity of 

 elytral form, I take to be sexes of the same species. The male has the 

 elytra feebly arcuate on the sides and widest at base, the female has 

 the sides much more broadly rounded and broader at middle. In the 

 male the thorax has, near the apex, a very shallow broad fovea com- 

 posed of three depressions scarcely separated. The male anterior 

 tarsus is more dilated than the female. The accompanying diagrams 

 illustrate the two forms, that of the % being a fair representation, 

 that of 9 having the sides of thorax rather too strongly arcuate. In 

 this species the hind angles of the head are less prominent than in 

 our other species, americanus, Lee, or the testaceus, Mull., of Europe. 

 The prosternum distinctly separates the anterior coxae, is prolonged 

 slightly behind them, obtuse at tip and furnished with a brush of 

 rather stiff hairs. The mesosternum is carinate as in the other species, 

 and separates the middle coxas rather more widely than in L. ameri- 

 canus. The latter species has the prosternum very short and the 

 coxae are contiguous. 



TRANS. AJ1ER. ENT. SOC. IV. (19) OCTOBER, 1872. 



