38 GEO. H. HORN. M. D. 



Middle tibiae with a slight brush of erect hairs at the upper third. Length .16 

 inch; 4 mm. 



The elytra are slightly sinuate near the apex ; the marginal ridge 

 does not attain the tip, and the apices appear as if slightly prolonged. 

 There is also a short scutellar stria here present not evident in the 

 other species. The characters above given with those in the table will 

 enable the species to be readily recognized. 



One specimen from the San Pedro River, Arizona. 



E. abnormis, n. sp.— Elongate, sub-parallel, brownish, opaque. Thorax slightly 

 longer than broad, moderately convex, densely punctured, a lateral carina and 

 a median longitudinal impression not reaching the apex nor extending beyond 

 three-fourths the length of the thorax; sides moderately rounded at middle, 

 feebly sinuate beyond. Elytra subparallel, slightly flattened on the disc, dis- 

 tinctly striate, strise coarsely and closely punctured. Third interspace cari- 

 nate at base for one-third its length, fifth carinate for one-half the length of 

 the third, sixth and (?) seventh carinate nearly their entire length, interspaces 

 and carinse finely granulate. Under surface sparsely granulate. Last abdo- 

 minal segment with an acute incision on each side. Length .16 inch; 4 mm. 



San Pedro River, Arizona; Peninsula of California. Coll. by Mr. 

 Gabb. 



This species may be recognized by the characters above given. It 

 resembles greatly our species of Stenelmis in its general aspect, but 

 the unmistakable line of pubescence on the anterior tibite indicates its 

 generic place notwithstanding the fact that its appearance caused 

 me, until the present, to place it with Slenelmis in my cabinet. 



E. pusillus, Lee. (Stenelmis) Proc. Acad. 1852,44; Zimm {Limnius) Trans. Am. 

 Ent. Soc. 1869, p. 259. 



Middle States and Canada. 



E. similis, n. sp. Thorax slightly longer than broad, sides moderately rounded 

 at middle, slightly sinuate in front, and near the hind angles. Disc with two 

 broad, oblique folds converging backwards and joining a longitudinal median 

 fold. Elytra sub-parallel, distinctly striate, striae with coarse punctures, 

 towards apex scarcely less distinct; near apex slightly sinuate as in abnormis. 

 Second interval with a short carina, fourth interval carinate, extending three- 

 fourths, sixth carinate, extending from humeri nearly to apex. Length .OS 

 inch ; 2 mm. 



This species and pusi/his, Lee, are so closely allied as to be with 

 difficulty separated. In similis the punctures are more evident at 

 apex of elytra, the carinate intervals more acute, the thorax more sinu- 

 ate in front. In jmsillus there is a distinct humeral and sub-apicul 

 paler spot, in this species the elytra are of a uniform brownish black 

 color. Both species have a similar formation of the elytral apex as in 

 abnormis, and the last abdominal segment has a similar incisure on 

 each side. Pusillus and similis are similar in size. 



Occurs in the San Pedro River, Arizona. 



