NATURAL SCIENCES OF PHILADELPHIA. 
81 
utrinque pone medium interrnpta, margineqiie abbreviato nigris, nitidis ; 
scutello nigro, elytris striis foveatim punctatis, inters titiis parce punctulatis, 
alternis latioribus nitidis, puncto humerali nigro, coxis macula magna ab- 
dominali epipleuris commissurisque nigris ; tarsis articulo 3io dilatato, lateri- 
bus spongioso. Long. '56. 
Sonora, Dr. Webb, one specimen. Resembles in appearance a species found 
in the Atlantic States, but differs by the thorax being more uniformly punc- 
tured, as well as by the black dorsal vittse. 
S. vomerinus, ovalis, sordide ater opacus, fronte foveata, thorace dense 
punctato, linea dorsali angustissima subnitida, latitudine baud longiore, lateri- 
bus^ rotundatis, antice angustato, et tubulato ; elytris a humeris angustatis, 
striis profundis, internis parum, externis foveatim punctatis, interstitiis con- 
fertim punctatis ; tarsis articulo 3io baud dilatato, tibiis anticis angulo externo 
apicali quadratim producto ; rostro compresso ad basin subito dilatato et punc- 
tato. Long -SS— -42. 
Sonora, Dr. Webb. Of the form and size of S. ret us us, but very dis- 
tinct. The anterior tibiae are terminated by the usual ihternal acute tooth, 
above which is a small one, and again at the middle an obtuse angle : the 
outer angle, however, instead of being obliquely rounded as usual, is pro- 
duced into a broad truncate process. The third joint of the tarsi is verj'- 
slightly dilated, and they are merely ciliate at the sides. 
Rhyncolus Kreutzer. 
R. dorsalis, elongatus cylindricus, niger nitidus, capite punctato, 
rostro capite breviore deplanato, tenuiter canaliculate, thorace capite parum 
latiore latitudine longiore, antrorsum sensim paulo angustato, ad apicem 
transversim impresso, sat dense punctato, linea dorsali laevi, elytris striis 
crenatis, interstitiis paulo convexis, antennis validis, clava oblonga funiculo 
vix latiore. Long. -10. 
One specimen, San Diego, California. 
R. angularis, cylindricus, niger nitidus, capite parce punctato, rostro 
deflexo, medio parce lateribus densius punctato, capite vix breviore, ad apicem. 
vage angulatim impresso, thorace latitudine longiore, grosse punctato, an- 
trorsum sensim paulo angustato, lateribus rectis, ad apicem subito parum 
constricto, angulis pone apicem obtusis at distinctis ; elytris punctis quadratic 
profundis striatis, interstitiis convexis, uniseriatim punctatis ; pedibus an- 
tennisque piceo-rufis, his clava oblonga rufa, funiculo duplo latiore. Long. 
•08— -10. 
Under willow bark, at New River, Colorado Desert. 
Hylesinus Fabr, 
H. hystrix, cylindrico-ovalis, crassus nigro-piceus, setis brevibus erectis 
pallidis vestitus, punctatus, elytris margine basali fortius elevate, punctis 
quadratis striatis, interstitis 2ndo postice late sulcato, 3io ante apicem valde 
elevate, tridentato. Long. -09. 
San Diego, California, one specimen. By the curious posterior sculpture of 
the elytra a broad and deep excavation is produced : the club of the antennae 
as in the other species is distinctly annulated. 
Mallodon Serv. 
M. g n a t h 0 , depressus, nigro-piceus nitidus, capite rude et confluenter 
cribrato, subcanaliculato, thorace transverse, parce punctato, medio late 
Iconcavo et punctis paucis magnis insculpto, versus latera cribrato, inaequali, 
ateribus parallelis serrulatis, angulis posticis oblique late emarginatis, elytri* 
fortiter marginatis vix rugulosis ; mandibulis maris elongatis pone apicem 
dente magno armatis, intus parce pilosis. Long. 1*35. 
1858.] 6 
