360 PROCEEDINGS OF THE ACADEMY OF 



Thorax without lateral lines ; basal dilatation of claws 



dentiform : 



Elytra with denuded black bands 3. seminudus. 



Elytra equably pubescent : 



Sides of thorax broadly rounded 4. p u s i 1 1 u s. 



Sides of thorax strongly rounded 5. cat a 1 inae. 



1. D. hudsonicus, elongatus, ater, pube subtili cinerea parce vestitus. 

 pilis brevibus erectis nigris intermixes, capite subopaco rugose punctato ; 

 thorace subtilius punctato, latitudine breviore, a basi antrorsum angustato, 

 apice truncato, lateribus subbisinuatis, basi late rotundata, angulis posticis 

 rectis, linea arcuata utrinque profunda impressa, ad basin ambiente minus 

 profunda; elytris thorace paulo latioribus, subtiliter punctatis et transversim 

 subrugosis. Long. 4 mm. 



One male collected in Hudson Bay Territory by Mr. R. Kennicott, given me 

 by Mr. Ulke. The antennae are as long as the head and thorax ; the second 

 joint is as long as the third ; the third is narrower than the fourth, which is 

 triangular and equal to the fifth. The ungues at the base are dilated into an 

 obtuse rounded lobe, which leaves only one-third of the claw free. The sixth 

 ventral segment is prominent, and deeply excavated. 



This species wouid be quite as well placed in Group III ofPristoscelis, 

 except that no spines are visible on the outer side of the anterior tibiae ; the 

 general appearance, as well as the sculpture of the thorax, indicate an affinity 

 with the next species, from which it differs by the finer mmctuation and pu- 

 bescence, and by the sides of the thorax being slightly Disinuate, feebly an- 

 gulated at the middle, and not serrate. 



2. D.b r e v i u s c u 1 u s Motsch., Bull. Mosc. 1859, ii. 396. 



One female, California ; given me by Mr. A. Murray. My specimen differs 

 from that described by Col. Motschulsky in having the antennae and feet of a 

 uniform black color; but as will be seen in the descriptions of other species 

 of this tribe, these characters are not constant, and I therefore consider the 

 specimen before me as belonging to his species. The pubescence is coarser 

 than in the preceding, and the black hairs are not very obvious ; the thorax 

 is more sparsely and quite finely punctured at the middle, and more rugosely 

 at the sides, which are broadly rounded and slightly serrate; the elytra are 

 less finely punctured ; the ungues are armed with a lobe, which is obliquely 

 truncate at tip, and leaves one-half of the claw free. 



Two specimens from Nebraska, given me by Mr. Ulke, differ from the Cali- 

 fornian specimen by the sparse punctures of the middle of the thorax being 

 less fine. I am unwilling to regard them as indicating a distinct species. 



3. D. seminudus, elongatus, niger, pube cinerea vestitus, capite tho- 

 raceque, sat dense subtilius punctatis, hoc latitudine sesqui breviore, convexo, 

 lateribus rotundatis subserratis, fimbriatis, basi late rotundata, angulis pos- 

 ticus obtusis ; elytris subtilius punctatis, transversim subrugosis, basi an- 

 guste, fascia media lata apiceque densius cinereo-pubescentibus ; pedibus 

 nigro piceis, unguibus dente lato armatis, diruidio externo liberis. Long. 

 2-5 mm. 



Variat antennarum articulis 2 et 3, tibiisque piceo testaceis vel piceis. 



Two females from Middle California, in the collection of Mr. Ulke, are be- 

 fore me; in one the antennae and feet are almost black, in the other thesecond 

 and third joints of the antennas and the tibiae are much paler. 



4. D. p u s i 1 1 u s Lee.. Proc. Acad. Nat. Sci. Phila., vi. 170. 



San Diego, California; a small coarsely pubescent species, having the tho- 

 rax nearly twice as wide as its length, moderately rounded and finely serrate 

 on the sides ; the elytra are coarsely punctured ; the second, third and fourth 

 joints of the antennae and the legs are ferruginous in one specimen ; but in 

 three others the antennae are entirely black, and the feet, especially the hind 

 thighs, are dark. 



[Dec. 



