28 U. S, P R. R. EXP. AND SURVEYS ZOOLOGY 47TH PARALLEL. 
base^ believing that sucb 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. cali/ornicum, valde elongatum, nigrum, nitidum, fronte profunde bifoveato, utrinc[ue 
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. 
Sienomorphus californicus Chaud. Bull. Mosc. 1844, 478. 
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 tibia3, 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 tibias are also present in the Texan species. In the one now under considera- 
tion, the anterior tibire 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. 
8. Umhalis, 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. 
8. 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 8. ocliropezus, but the thorax is less deeply foveate at the 
base, and not at all punctured ; the striae of the elytra appear less deep. 
