1853.) | | 445 
This species is remarkably different from all those above described by the medial 
groove of the rostrum being obsolete, except towards the tip, where it appears 
as an oblong fovea ; the lateral grooves are not deep, and end at the transverse 
impression at the base of the rostrum. Over the body and legs the white scales 
are intermixed with pale fuscous, giving a dullness to the color; the fuscous 
stripes of the elytra are very variable, sometimes they are well defined; in other 
specimens they are confused by fuscous spots on the adjoining interstitial spaces ; 
the dark fascia of the femora is moderately distinct. 
9. O.sordidus, niger, griseo-fuscoque squamosus, rostro trisulcato, sulcis 
profundis, lateralibus rectis brevibus, thorace latitudine sesqui breviore, antice 
subangustato, lateribus late rotundatis parce punctato, subcanaliculato, elytris 
convexis thorace latioribus, striis vix 1mpressis punctatis, interstitiis planis. 
Long. -37. 
One female specimen, Platte River. The posterior marginal impression of the 
thorax is indistinct ; the anterior one is entire, broad but not deep; the brown 
and gray scales are intermixed and do not form any well defined spaces ; the 
latter color predominates on the head, and the former on the elytra. 
10. O. decipiens, piceus (dense ?) griseo-squamosus (elytris fusco variega- 
tis ?) rostro sulco medio minus profundo antice lato, lateralibus brevibus indis- 
tinctis, thorace latitudine non breviore, lateribus antice posticeque paulo rotun- 
datis, disperse profunde punctato, canaliculato, elytris convexis, thorace paulo 
latioribus, striis modice impressis profunde punctatis, interstitiis paulo convexis. 
Long. °3. 
One male found by the Commission at Eagle Pass. Thescales are unfortunately 
removed in great part, but the elytraat the apex show some appearance of having 
been variegated with darker marks. Beneath, the body is uniformly and densely 
covered with grayish scales. The sides of the thorax are nearly straight at the 
middle, narrowed and rounded slightly at each end ; tne transverse marginal im- 
pressions are visible only in the sides. The rostrum is more flattened above 
than in any other species, and the middle groove is very indistinct, and so di- 
lated anteriorly that the surface becomes broadly concave ; the lateral grooves 
are very short and not deep. The appearance is very similar to Epicerus, but 
the ciliate thoracic postocular lobes require it to be placed in this genus. 
« Although but two new species of this interesting genus were procured by the 
Boundary Commission, I have thought that a short account of all the species 
known to me, would be useful. 
Pretecypuorus Sol. 
P. elatus, niger, capite profunde impresso, thorace latitudine paulo breviore, 
Jateribus antice latissime reflexis medio angulatis, angulis anticis et posticis dis- 
tinctis, elytris oblongo-ovalibus, postice acutiusculis, convexis, thorace plus 
duplo latioribus punctis rugosis minus profundis impressis, lineis tribus sutura- 
que levibus, epipleuris subito inflexis, humeris minutis porrectis. Long. 1:3. 
A large species, remarkable for the form of the thorax, which is tolerably re- 
gularly hexagonal, with all the angles well defined ; the sides are very strongly 
reflexed anteriorly, but become gradually narrower from the lateral angle to the 
base. This speciesagrees with P.con fluens Lec. and the next species, as well 
as with all the others referred by me to the genus,except Asida anastomosis,in hav- 
ing elongate palpi with the last joint strongly securiform, anda large lateral open- 
ing between the mentum and the base of the mandibles. The species referred 
by me to Euschides (Stenomorpha Solier,) have the same form of mouth, but ap- 
pear to have the last joint of the palpi broader and more regularly triangular. I 
am doubtful about the generic value of that character, but at present all is con- 
fusion in regard to genera of Tenebrionidw ; the prosternum is longitudinally 
deeply concave between the anterior coxw, and is not produced posteriorly ; the 
sides of the elytra are not margined, although the epipleura are suddenly inflexed. 
P. sordidus, piceo-niger, capite modice impresso, punctato, thorace latitu- 
dine fere sesqul breviore, ante medium angustato, lateribus rotundatis subserra- 
tis, deplanatis, subreflexis,confertim grosse inequaliter punctato, elytris oblongo- 
