446 [ DECEMBER, 
ovalibus, convexis postice subacutis, sutura, margine. costisque utrinque dua- 
bus elevatis lineis transversis sinuatis inter se irregulariter convexis. Long. 
°75—°89. 
Arkansas River, near the mountains. The female has the elytra twice as wide 
as the thorax, and more rounded on the sides than in the other sex. The antepectus 
is sulcate between the coxe, but the groove is narrower than in the preceding 
species. ‘The specimens arecovered with an earthy matter, which adheres very 
strongly. 
Another species was found by the Commission, of which only the elytra are 
preserved ; they are obovate, dilated gradually for three-fourths of their length 
somewhat flattened anteriorly, very declivous, and subacute posteriorly, trun- 
cate at base with a well defined margin; lateral margin acute, extending within 
one-fifth of the apex ; the disc is sparsely punctured, and each elytron is marked 
with three faint elevated ridges obsolete at both ends, and of which the exter- 
nal one is the most distinct. The sculpture of the under surface and the pro- 
portions of the legs are exactly those of P.sordidus, which it will probably 
resemble in the form of the thorax. As the characters drawn from the form’and 
sculpture of the elytra are very distinct in this genus, I venture to name this 
species P,. subcostatus. 
Microscuatia Sol. 
M.contorta, sordide fusca, longiuscula, capite profunde excavato, thorace 
hexagonali, latitudine vix breviore, angulis lateralibus apice rotundatis, lateri- 
bus postice paulo emarginatis, disco canaliculato, inzquali, elytris postice dila- 
tatis, lateribus serrato-tuberculatis, costa discoidali alte tuberculata irregu- 
lariter fracta, cum sutura elevata lineis transversis connexa ornatis. Long. -37. 
From the collection of the late Dr. Berlandiere ; this very ugly insect 
bears a certain analogy to Asida anastomosis Say, in appearance, but is 
very distinct by the hexagonal thorax, and more rough elytra; the discoidal 
costa ends about one-fourth from the apex in a high tubercle; the marginal series 
of tubercles ends by bending inwards to the suture about one-sixth from the apex. 
The maxillary palpi are small, and can be almost entirely concealed behind 
the mentum, which not only fills up the progenial cavity, but abuts against the 
mandibles, entirely covering the mouth beneath ; this is also the case in Asida 
anastomosis, and in the two species of Microschatia described by me (Ann. Lyc. 
5, 129,) which are properly congeneric with that species ; it remains still to be 
determined whether they should enter Solier’s genus, of which only one species 
was known to the inventor. 
The present species differs from all the others mentioned in having the third joint 
of the antenne not longer than the fourth ; the prosternum is broadly produced 
posteriorly, as in M. inequalis. 
Asida anastomosis, incorrectly referred by me to Pelecyphorus, has the pros- 
ternum regularly rounded and not produced posteriorly. 
Triororyus Lec. 
T. nodiceps, ater, minus nitidus, capite subtilius postice densius punctato, 
lateribus margine tenui reflexo, fronte tuberculo magno obtuso ornata, thorace 
transverso punctato, basi marginato, lateribus rotundato, angulis anticis porrec- 
tis, elytris ventricosis rotundatis thorace plus duplo latioribus, 9-seriatim punc- 
tatis. Long. °33. 
One specimen: Eagle Pass. Differs from the three species described by me 
(Ann. Lyc.5, 141) in theless punctured head, the much larger frontal tubercle and 
by the wider and more inflated elytra. 
EmBapuion Say. 
1. E. concavum, elongato-ellipticum, nigrum, thoracis et elytrorum late- 
ribus altissime reflexis, illo antrorsum angustato disco parce punctulato, lateribus 
parcius subtilius muricatis, elytris subtiliter muricato-punctatis, brevissime his- 
pidis. Long. 78, lat. °4. 
