NATURAL SCIENCES OF PHILADELPHIA. 
61 
paulo convexus, 3io unipunctato, 2 — 4 a medio fere ad apicem. nigris ; postpec- 
tore abdomineque nigro-piceis, ano rufo-testaceo, antennis paulo infuscatis, ad 
"basin testaceis. Long. -l?. 
A very pretty species found "by me at San Diego, California, and at Tuvac in 
Northern Sonora. The scutellar stria is merely a basal puncture. 
B. rivalis, rufo-testaceus nitidus, thorace latitudine rix breviore lateribus 
rotundatis, postice paulo angustato, angulis posticis obtusis minime rotundatis, 
ad basin utrinque late foveato et subtilius punctato, elytris elongatis thorace 
paulo latioribus, striis profundis, interstitiis paulo convexis, 3io unipunctato, 
saepe pone medium utrinque infuscatis ; sulbtus concolor, antennis fuscis ad 
basin testaceis. Long. -12— -14. 
Colorado Desert, at New River and at the Colorado. Readily distinguished 
from the preceding by the uniform color of the under surface, and by the finer 
and more numerous punctures of the base of the thorax ; the posterior angles 
are also not rounded but almost prominent. 
B. ventralis, rufo-testaceus nitidus, capite saturatiore, thorace latitudine 
vix breviore, lateribus rotundatis, postice paulo angustato, angulis posticis 
obtusis rotundatis, ad basin utrinque late foveato et ad medium punctato, 
elytris elongatis thorace paulo latioribus, striis profundis, 2nda unipunctata ; 
pectore abdomineque obscuris, antennis vix infuscatis. Long. '17. 
One specimen found on the Gila River. Of the same form as B. nubifer, 
but distinguished by the finer and more numerous punctures of the base of the 
thorax. Both species resemble in form B. rupestris, but differ by the 
punctures being accumulated at the inner part of the basal foveae, leaving the 
angles smooth, while the latter themselves are more rounded. 
Pasimachus Bon. 
P. viridans, niger nitidus, thorace limbo laterali et basali leete viridiaeneo, 
latitudine breviore, lateribus rotundatis anguste marginatis, postice brevissime 
sinuatis, angulis posticis parvis rectis ; elytris planiusculis subovatis, postice 
subacutis, seriatim punctulatis (seriebus perparia approximatis), limbo laterali 
et basali laete viridi-aeneo, margine ad basin magis reflexo, humeris vix dis- 
tinctis, carina humerali brevissima fere nulla ; tarsis posticis tibiis hand Ion- 
gioribus. Long. 1*08. 
One specimen, Sonora, Mr. Schott. A very distinct species, remarkable not 
only by its color, but by the almost entire absence of the humeral carina. The 
second, third and fourth joints of the antennae are less compressed than in 
P. depressus and validus. 
Lymn^um Stephens. 
L. laticeps, piceum, rufo-tinctum, depressum, cai)ite magno, oculis parvis 
rotundatis hand prominulis, fronte utrinque breviter impressa, thorace capite 
hand latiore, trapezoideo, lateribus subrotundatis et subsinuatis, angulis posti- 
cis rectis, linea dorsali profunda utrinque abbreviata, ad basin vix foveato ; 
elytris ellipticis striis externis obliteratis internis distinctis, 5to et submarginali 
postice profundis, dorso bifoveatis, palpis pedibusque testaceis fusco-testaceis., 
Long. -14. 
One specimen from the seashore at San Diego, California. 
QuEDius Leach. 
Q. explanatus, niger parum nitidus, capite subtiliter parce punctulato., 
thorace elytris fere latiore, lateribus explanatis ; abdomine elytrisque pubes- 
centibus, his subtiliter dense punctulatis, antennis utrinque attenuatis. Long., 
*38 — *5. 
San Diego, California, under stones. A fine species very different from any 
previously described. It belongs to division (*1) of Erichson, 
1858.] 
