NATURAL SCIENCES OF PHILADELPHIA. 
67 
et tubercTilis parum elevatis compositis, postice serratis ad apicem. bidentatis. 
Long. •77—1-0. 
Dr. Webb. Found witli the preceding, which it resembles in form and 
characters. It is however more slender, the basal margin of the thorax is 
more elevated, and the costfe of the elytra are hardly to be seen. The sculp- 
ture of the under surface is precisely as in L. p 1 a n i c o s t a. 
C. caelata, capite seneo punctate, lineis elevatis reticulato, tliorace rugis 
profundis aenescentibus punctatis minus densis insculpto, interstitiis elevatis 
politis cyanescentibus, antrorsum angustato, lateribus late rotundato, ad apicem 
transversum impress©, ad basin trisinuato, angulis posticis acutis ; elytris 
punctato-striatis, transversim parce at profunde rugosis, postice subserratis, ad 
apicem truncatis bidentatis ; subtus senea pubescens dense punctata, pectore 
abdominisque segmentis postice grosse punctatis, nitidis chalybeo-variegatis. 
Long. -93. 
One specimen found at Ures, Sonora, by Dr. Webb. This has also nearly 
the same form and general characters as the two preceding, but the sculpture 
both above and beneath is much coarser. The tip of the 5tli ventral segment 
of the abdomen in them is broadly emarginate, with an acute elevated trans- 
verse line before the tip ; the lateral angles in one sex project in the form of 
teeth, while the outline in the other sex is simply sinuous. 
In the present species the line is not so acutely elevated, and beyond the 5th 
joint is seen a short punctured brown appendage, which is prolonged at the 
middle into an obtuse process. 
The antennal pores in this and in B. s p h e n i c u s Lec. which is strictly con- 
generic, are more numerous than in the two preceding, and occupy nearly the 
whole of the sides of the outer articulations ; the basal joint of the jDOSterior 
tarsi is also but little longer than the second. 
Chrysobotheis Esch. 
C. gemmata, latiuscula, depressa, capite punctate Isete seneo, chalj^beo- 
variegato, thorace punctate densius versus latera, subcanaliculato, ad latera 
utrinque, et ad apicem oblique impresso, versus basin utrinque late foveato, 
his impressionibus omnibus in fundo inauratis ; elytris purpureis, punctatis, 
costis antice obliteratis postice autem distinctis, 3ia pone stigma baud extensa ; 
fovea basali, stigmate ante medium, alteroque externo pone medium reniformi- 
bus, tertioque interne triangulari Isete inauratis dense imnctatis, strigaque 
brevi humerali aurea ornatis ; subtus viridiaurea nitida punctata, segmentis 
abdominis postice, pleurisque chalybeis. Long. -88. 
Sonora ; two females collected by Mr. Schott. The sides of the thorax are 
in one specimen obliquely truncate at the anterior angles, then oblique and 
slightly converging to the base : in the other specimen they are rounded an- 
teriorly instead of truncate. The 5th ventral segment is carinate in the middle, 
but the usual lateral tooth is not seen. 
C. octocola, depressa senea, capite ssepe virescente, dense rugose punc- 
tate, thorace dense subtilius punctate, latitudine breviore, lateribus parum 
rotundatis, antice oblique subtruncatis, elytris subtilius confertim punctatis, 
costis duabus primis integris, 3ia postice, 4ta vero antice abbreviata, fovea 
profunda basali, stigmatibusque tribus dense punctatis inauratis ornatis, prime 
ante medium in costam 2ndam, 2ndo pone medium in costam 3iam ssepe reni- 
formi, tertio triangulari inter costas Imam et 2ndam ; subtus senea punctata. 
Long. '45 — -65. 
Found in Texas, by Messrs. Haldeman, Schott, and Weise ; in Sonora by 
Mr. Schott, and on the Colorado River near the Gila by myself. Varies much 
in size and form. The anterior and middle tibise of the male are much curved, 
but slender and armed internally with only a few very small teeth. This 
species lives on the various species of Mezquite. The 5th ventral segment of 
the female, as usual, is finely carinate in the middle, with the lateral teeth 
distinct. 
1858.] 
