130 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



introductory remarks to Dr. Boving's paper on Hydroscapha and 

 requires characterization in order to enable us to distribute du- 

 plicate specimen to the workers in Hydrophilidae. Since Dr. 

 Sharp 1874 has pointed out the close affinity of Epimetopus with 

 Spercheus we take this opportunity to append a description of an 

 appearently new species of the latter genus from the Philippines. 



Epimetopus thermarum n. sp. 



Similar to E. costatum Lee. but larger, piceous, except the legs and 

 apical half of elytra which are refescent, more coarsely tuberculate and 

 with the eye completely divided by the canthus. Length 2.2 to 2.8 mm. 

 width 1.2 to 1.6 mm. 



.Habitat: Arizona. 



Front coarsely tuberculate, opaque; labrum smooth, shining, feebly 

 emarginate; canthus apparently completely dividing the eye, its upper 

 and lower edges tuberculate and separated by shallow sulcus. Antennae 

 9-jointed, with loosely connected 3-jointed club; scape as long as the 

 rest of the antennae, bent inward and thickened apically; second joint 

 subglobular and nearly as wide as apex of the scape; third to sixth in- 

 clusive hardly half as wide as, and together not longer than the second, 

 first joint of club about same size as second joint of antenna, second twice 

 as wide but not longer, last joint a little wider and three times as long 

 as first. Last joint of maxillary palpi as long as club of antennae. Pro- 

 notum slightly wider than long, sides strongly angulate at middle, front 

 margin produced over head, surface coarsely tuberculate with a pair of 

 longitudinal costae uniting at basal fifth and apical tenth inclosing a 

 lance-shaped median impression, and an outer pair of sinuate costae at 

 lateral fourth. Elytra each with sutural, marginal, and four interme- 

 diate carinae, the second of the latter being interrupted at basal fourth, 

 the third joining the humerus and the fourth obsolete except a trace 

 behind middle and a prominent elongate tubercle at basal third. Inter- 

 costal areas each with two series of large round almost perforate punc- 

 tures, and three series of tubercles. Tarsi 5-jointed, tibiae octagonal, 

 the carinae with setigerous serrations. 



Sexes similar in all external characters. 



Type and paratypes:U. S. N. M. No. 21,052. 



Described from a large series (90 specimens) collected by the 

 writers June 24-26, 1901, in the algal accumulations at the mar- 

 gins of the warm stream (about 100 F.) flowing from the Castle 

 Creek Hot Springs, Yavapai Co., Arizona. A single specimen w:is 

 also taken at the same place by the writers, December 27, 1913, 

 bsing the only one observed during a diligent search at that season. 



At the time of our first discovery of this species the hot stream 



