28 U. S. P. R. R. EXP. AND SURVEYS ZOOLOGY 47TH PARALLEL. 



base, believing that such a character could hardly escape the acute observer who described it, 

 but much greater was my surprise to find the same character in P. mollis ; on examining the 

 tooth of the mentum, I found that it was bicuspid, as in other species of Pristodactyla, and I 

 am now convinced that all species placed by authors in Platynus, (Anchomenus and Agonum,) 

 which have but two dorsal punctures on the elytra, must be removed to Pristodactyla. 



AGAOSOMA Menetries. 



A. californicum, valde elongatum, nigrum, nitidum, fronte profunde bifoveato, utrinque 

 parce punctato, thorace latitudine plus duplo longiore, lateribus late rotundatis, utrinque 

 angustato, sed postice angustiore, ad basin utrinque, et ante basin medio vage foveato, elytris 

 thorace vix latioribus, ad basin truncatis; profunde striatis, interstitiis paulo convexis. Long. 

 69, Tab. I, Fig. 5. 



Menetries, Bull. Acad., St. Petersburg, 1843, 63: Mann. ibid. 1845, 108. 



Stenomorphus californicus Chaud. Bull. Mosc. 1844, 4Y8. 



Sacramento ? California ; a specimen collected by Mr. Woznessensky, the only person by 

 whom it has been found, was sent me in exchange by Dr. Klug, of Berlin. On comparing 

 with a Texan species of Stenomorphus, yet undescribed, I find that the differences in the pos 

 terior tibise, to which attention was called by Mannerheim, exist in part, but hardly to the 

 extent indicated in his comparison between this species and S. angustatus Dej. The rows of 

 spines visible in Stenomorphus are replaced by stout hairs, but the deep grooves on the inner 

 face of the hind tibise are also present in the Texan species. In the one now under considera 

 tion, the anterior tibias are internally fringed with long dense white hair, (Tab. Fig. a,) 

 while in Stenomorphus only a few scattered bristles can be seen. This difference, with that of 

 the form, seems to indicate that the genus Agaosoma should be preserved, at least for the 

 present. 



STENOLOPHUS Dej. 



S. limbalis, olivaceo-niger, aenescens, nitidus, thorace subquadrato, latitudine breviore, lateri 

 bus modice rotundatis, basi utrinque punctulato et late foveato, limbo toto anguste testaceo, elytri 

 thorace paulo latioribus, apice sinuatis, striis sat profundis, postice profundioribus, interstitiis 

 planis, tertio unipunctato, epipleuris, antennarum articulo Imo, pedibus, coxisque anterioribus 

 testaceis ; palpis piceis apice testaceis. Long. 26. 



Very abundant at San Jose, California. The anterior and middle tarsi of the male are 

 dilated, and the last joint is deeply bilobed, as in S. versicolor, which this species closely 

 resembles in form. The foveae of the thorax are broader, and the base more punctured ; the 

 posterior angles are much more distinct. 



S. anceps, nigro-piceus, nitidus, thorace latitudine paulo breviore, subquadrato, lateribus 

 rotundatis, postice subangustato, angulis posticis obtusis rotundatis, basi laevi utrinque late 

 foveato, limbo toto rufo-testaceo, elytris cyaneo-micantibus, sutura margineque rufo-testaceis, 

 thorace paulo latioribus, striis impunctatis, 2nda unipunctata, ad apicem oblique subsinuatis, 

 antennarum basi, pedibus coxisque testaceis. Long. 24. 



San Francisco. Closely allied to S. ochropezus, but the thorax is less deeply foveate at the 

 base, and not at all punctured ; the striae of the elytra appear less deep. 



