444 _  [DEcEMBER, 
profundissimo, lateralibus rectis profundis, mox ante oculos abbreviatis, thorace 
latitudine plus duplo breviore inzquali, parce profunde punctato, lateribus sub- 
bituberosis, canaliculato spe fusco trivittato, elytris striis vix impressis pro- 
funde punctatis, sutura cuprascente, fusca-interstitiis 3, 5 et 7mo fusco-vittatis. 
Long. -41—-48. 
Schonherr, Cure. 1, 509; 5, 819. 
Liparus vittatus Say, Journ. Acad. Nat. Sc. 3, 316. 
Platte and Arkansas Rivers; not rare; found also by the Commission at Eagle 
Pass. ‘The elytra of the male are but little wider than the thorax, those of the 
female are more rounded, a little flattened on the back, and about one half wider 
than the thorax; the dark vitte of the thorax and elytra appear to be produced, 
in part, by abrasion, as specimens occur in which they are hardly to be seen. 
The suture, as far as the first stria, is covered with brown scales, having a shght 
coppery reflexion. 
B. Thorax lateribus late reguiariter rotundatis. 
6. O. speciosus, niger supra cupreo-fusco-squamosus, capite albo-squa- 
moso vitta frontali alteraque pone oculos utrinque fuscis, rostro 5-suleato, sulcis ° 
intermediis brevibus haud profundis, thorace latitudine breviore lateribus rotun- 
dato parce subtiliter punctato, subtiliter canaliculato, vitta utrinque dorsali 
alteraque in latere niveis, elytris elongato-ellipticis striis profundis punctatis, 
interstitiis Vix convexis, parce punctulatis, 2, 4,7mo niveis, lateribus et subtus 
albo-squamosus. Long. °8. 
Eagle Pass, several specimens. ‘This fine species is certainly the most beau- 
tiful of this family yet found in the United States: the lateral grooves of the 
rostrum are situated in the side and converge a little posteriorly ; the inter- 
mediate grooves occupy the position of the lateral grooves in the species of 
division (A.) and are very short, not by any means obvious ; the vitte of the 
thorax are made up of spots placed close together and separated by narrow lines; 
two or three small spots are scattered between the dorsal vitta and the lateral 
one; th? anterior and posterior constriction, with their rows of punctures areas 
in the species of the first division, but are hardly apparent in the lateral outline 
of the thorax, which is regularly curved, only a little indented at base and apex ; 
the elytra of the male are about one-fourth, those of the female about one-third 
wider than the thorax ; the snowy white vitte are a little irregular in their out- 
line, the elytra beyond the 7th stria are covered with grayish white scales, simi- 
Jar to those of the under surface, and contrasting with the snowy whiteness of 
the vittz ; the legs are speckled with dark fuscous, but the usual femoral band 
is not seen. 
7. O.argentatus, niger, equaliter argenteo-albo-squamosus,vix variegatus, 
rostro basi impresso, trisulcato, sulcis angustis profundis, lateralibus postice 
paulo incurvis, thorace latitudine paulo breviore, inequali canaliculato, pro- 
funde grosse punctato, lateribus late rotundatis, elytris ovalibus, striis vix ime 
pressis punctatis, interstitiis paulo convexis. Long. -69. 
One female, with the elytra nearly twice as wide as the thorax, found at Val- 
lecitas, California ; the anterior and posterior marginal impressions of the tho- 
rax are entire and very distinct, uniting with the dorsal line ; the color is more 
uniform than in the other species, nevertheless the elytra are slightly mottled ; 
an occipital line, the sides of the rostrum, and a space behind the eyes are covered 
with fuscous metallic scales; the dark band of the femora existing in many of 
ay species is more conspicuous in this, on account of the denser white scales of 
the legs. 
8. O. varius, niger, albo-squamosus, capite fusco-variegato, rostro bisul- 
cato, basi impresso, versus apicem medio foveato, thorace latitudine non breviore, 
subinzequali, subcanaliculo, grosse parce punctato, fusco trivittato, lateribus late 
rotundatis, elytris striis tenuibus minus profunde at grosse punctatis, interstitiis 
non convexis, 3io 5toque plus minusve fuscis. Long. -35—-44. 
Desert of the Colorado, California ; chiefly on Larrea Mexicana. The elytra 
of the male are not wider, these of the female are twice as wide as the thorax. 
