64 OrpErR—COLEOPTERA. Section—PENTAMERA. 
Syn.: Cremastocheilus nitens. Leconte, Proc. Acad. Philad. vol. vi. 1853, p. 232. 
‘Body black, shining, with a few short yellow bristles. Head convex, grossly confluently punctured, with 
a small tubercle on each side above the base of the antenne; mentum excavated, the posterior margin of the 
excavation ciliated, acutely produced at its middle. Thorax one-half wider than long, gradually narrowed 
in front, suddenly constricted at the base; the apex with a deep impression near the anterior angles, which are 
tuberculiform; the bases deeply depressed; the posterior margin truncated ; the posterior angles obtuse, tuber- 
culiform, little prominent; surface sparsely punctured, more thickly towards the sides. Elytra slightly im- 
pressed near the scutellum with deep confluent punctures; humeri and scapule smooth. 
‘This species is readily distinguished by its lustre, by the deep depression at the basis of the thorax, and 
the scattered punctures of its disc,’ &e. 
Specres 14 (100)—CREMASTOCHEILUS SAUCIUS. 
Rufo-castaneus, nitidus ; thorace transverso, angulis anticis auriculatis, posticis incisis et retrorsum acumi- 
nato-productis; disco ad angulos anticos breviter, intra posticos longe exarato, parte mediana qualiter subtilius 
punctata, lateralibus incrassatis, convexis levibus, extrorsum punctatis; elytris punctis elongatis sat densis 
insculptis ; pygidio punctato subcarinato ; mento parum concavo, margine postico subangulato, haud inciso. 
Long. corp. lin. 5. 
Habitat ; Pole Creek, Nebraska (Mr. W. Wood), Llano Estacado (Captain Pope). 
Syn.: Cremastocheilus saucius. Leconte, Journ. Acad. Nat. Sc. Philad. vol. iv. 2nd Series, 1858, p. 16. 
Readily known by the remarkable form of the thorax, the surface of which is divided into three lobes by 
the meeting of the long posterior and the short anterior excavations, which commence immediately at the 
respective angles. It belongs, with the other Western species, to the division with the mentum entire. 
Species 15 (101) —CREMASTOCHEILUS KNOCHII. 
Puate XIV, Fic. 6. 
Ater opacus; fronte transversim carinata, thoracis lateribus rotundatis, angulis acutis; elytrorum disco 
subseriatim punctato; mento basi integro prominulo. 
Long. corp. lin. 5-54; lat. elytr. lin. 2. 
Habitat; Missouri, near Long’s Peak (Leconte) ; Colorado (D. Parry); Illinois (Mus. Berol. No. 41,582). 
Syn. : Cremastocheilus Knochti. Leconte, Proc. Acad. Philad. vi. 1853, p. 231. 
This species is small, narrow, black, glossy, and subconvex. The head is thickly and finely punctured ; the 
anterior margin strongly reflexed and rounded, and separated from the crown by a sharp, elevated, curved carina ; 
the angles in front of the eyes small but prominent, and the disc marked in front of each eye with an impres- 
sion. The mentum is moderately excavated, entire, and slightly produced in the middle of the posterior margin. 
The prothorax is transverse, convex, covered irregularly with large and deep round punctures, the centre having 
a longitudinal impression; the anterior angles are prominent, directed inwardly towards the eyes, but not 
elevated into tubercles; the sides of the prothorax are gradually rounded from the apex of the anterior angles 
nearly to the hinder ones, where they are formed into an acute triangular point, directed outwards; the hind 
margin of the prothorax is truncate, deeply impressed on each side near the posterior angles, which are acute 
and prominent; the surface moderately convex, with a slightly longitudinal furrow in the middle, grossly 
and sparsely punctured. The elytra are narrow and moderately convex, slightly depressed down the middle 
of each. The dise is moderately covered with a few transverse rug, with rather large, oval, cicatricose, 
shallow punctures, almost disposed in lines on the disc, and which become fewer and more rounded towards 
the apex. The teeth of the fore tibiz are less strongly prominent than in the majority of the species. The 
pygidium is sparsely punctate. Closely allied to Cr. Mewicanus Schaum, but smaller, with the thorax more 
rounded on the sides, and consequently broader at the apex and less constricted at the base. 
