34 Orper—COLEOPTERA. Section—PENTAMERA. 
The orbicular prothorax, with its deep circular excavation of the disc, will distinguish this most remarkable 
species from every other known Coleopterous insect. The under side of the prothorax is excavated in front, so 
that when the head is bent down it fits exactly into the hollowed space in front of the anterior coxe, leaving 
only exposed the dilated apex of the prosternal spine (fig. 10a, fig. 104 representing the under side of the head 
when raised up, shewing the large mentum covering the mouth). The mandible (fig. 10c) has the outer horny 
portion obtusely rounded at the tip. The maxille (fig. 10d) have the base elongated so as to be visible on the 
outside of the base of the mentum; the galea is strongly angulated at its base, nearly forming a right angle with 
the basal portion ; its apex is bifid, the apical tooth of the mando is much more slender, with its apex tri- 
dentate. The mentum (fig. 10) is wider than long, the sides beneath the insertion of the palpi dilated and 
rounded, the fore margin nearly straight and the palpi very short. The elytra are oblong with the sides parallel, 
delicately marked with oblique striolw, the suture elevated, and each having a strong and elevated carina near 
to and parallel with the suture. The legs are short and compressed and all the tibie are destitute of lateral spines. 
The tarsi are 3-jointed, the anterior (fig. 10,/, apex of tibia and tarsus seen from above; 10g, the same seen 
below) shewing a minute rudimental joint, or constriction, at the base of the first jomt. In the four posterior 
tarsi, which are 3-jointed, the basal joint itself is minute. The body beneath is black and glossy, with a 
slight pitchy tinge. The four basal segments of the abdomen beneath are marked with a broad, but shallow 
impression. They are covered with very large oval punctures, which decrease in size to the podex. The 
sides of the metasternum are obliquely striolated. 
I have named this most singular insect after my lamented friend Dr. Schaum, who, in the most liberal 
manner, assisted me to the utmost of his power in preparing this Monograph. 
Genus 19—CASNOCHILUS. 
(Schaum, Germar Zeitschr. iii. p. 268, 1841.) 
Corpus latitudine plus duplo longius, superficei dorsali punctata nitida. Clypeus transversus convexiusculus 
apice sinuato et parum reflexo. Antenne articulo basali incrassato sed non triangulariter dilatato. Mandi- 
bule parte externa cornea, extus rotundata apice obtuso. Maxillarum basis utrinque pone mentum conspicua, 
galea et mandone bidentatis. Mentum oblongum canaliculatum angulis anticis lateralibus rotundatis, margine 
antico plus minusve profunde inciso. Pronotum suborbiculare antice posticeque angustatum, angulis haud 
tuberculatis. Pedes validi mediocres. 'Tibiz omnes bidentate. Tarsi tibiis longiores 5-articulati. Abdomen 
maris subtus haud aut vix canaliculatum. 
The narrow elongated form of these insects, together with the bidentate structure both of the galea and 
mando of the maxille, the strong spine in front of the prosternum, the dilated apex of the anterior tibie in the 
males (bidentate in the females), distinguish them from the neighbouring groups. Some of them are of 
considerable size and others very small; the elytra are more or less costated, and the males in some species have 
the legs armed in a remarkable manner. 
The species are natives of Africa and the East, and are arranged below according to their localities, although 
some of them are so closely allied together (if not absolutely identical) as to have occasioned some confusion 
in their synonymy. 
Division I—SPECIES AFRICANA. (Sp. I-17.) 
Spectres 1 (56)—CGZNOCHILUS MAURUS. 
Prats XI, Fie. 5. 
Elongatus toto rufo-piceus, vel piceo-niger, nitidus ; clypeo transverso, paullo sinuato; mento subquadrato, 
angulis anticis rotundatis, margine antico bifido; vertice postice carina tenui transversa instructo: prothorace 
rotundato antice angustiori, parte latiori pone medium posita, margine antico in medio tuberculo elevato in- 
structo, lateribus distinete tenue marginatis, utrinque intus angulos posticos biimpresso et canali tenuissimo 
medio dorsali; elytris subcastaneis longitudinaliter canaliculatis; pygidio convexo; tibiis anticis subito ad 
apicem dilatatis: abdomine subtus segmentis mediis in medio vix impressis. 
