OLOGLYPTUS. 69 
with scattered punctures and three ridges—a marginal and a dorsal ridge turning obliquely inwards towards 
the suture behind, where they become confluent, and enclose a shorter ridge. 
Length 8 millim. 
Hab. Mexico (Sal/é). 
One example. Labelled Philolithus canus in the Sallé collection. 
4. Ologlyptus sinuaticollis. (Tab. II. fig. 19.) 
Rather elongate, convex, black, densely clothed with brown earthy-looking scales, pubescent. Prothorax 
transverse, sides rounded, and a little narrowed and sinuate in front before the prominent produced anterior 
angles, narrowed and strongly sinuate behind before the rectangular hind angles, base subtruncate, dorsal 
surface with scattered coarse punctures; elytra with the sides rounded, widest about the middle, base 
almost truncate, and narrower than the thorax, humeral angles obtuse, with scattered impressions, and 
three ridges—a marginal and a dorsal ridge turning obliquely inwards towards the suture behind, where 
they become confluent, and enclose a shorter elevation. 
Length 10 millim. 
Hab. Mexico, San Luis Potosi (Dr. Palmer). 
One example. Allied to O. graciliformis, but narrower, the elytra less widened 
behind, &c. 
5. Ologlyptus bicarinatus. (Tab. II. fig. 18.) 
Oblong oval, dull black, with scattered scaly hairs, pubescent. Head finely and sparingly punctured, trans- 
versely impressed in front; prothorax transverse, finely and sparingly punctured, the sides rounded, 
narrowed and sinuate behind, hind angles rectangular, a little narrowed in front and sinuate, the anterior 
angles rather prominent and acute, base broad, and subtruncate; elytra wider than the thorax at the 
base, rounded at the sides, widest about the middle, humeral angles obsolete and rounded, with two dorsal 
ridges—the first starting from near the shoulder, curving a little inwardly behind, the second shorter, 
not reaching the base, and a marginal ridge, these ridges obsolete a little before the apex, separate, and not 
confluent behind, between the first dorsal ridge and the suture there is a slight indication of another 
obsolete ridge, the surface with a few widely scattered fine punctures; anterior tibiee with a short, blunt 
tooth at outer apical angle; anterior and intermediate tibie finely denticulate externally ; femora coarsely 
punctured ; tarsi with rather long hairs beneath; scutellum smooth; trochantin visible, small. Beneath 
closely and rather finely punctured. 
Length 14 millim. 
Hab. Muxtco, Oaxaca (Hoge). 
One example. A species difficult to locate satisfactorily. 
6. Ologlyptus planatus. (Tab. I. fig. 16.) 
Oboval, depressed above, black, densely clothed with dark brown earthy-looking scales, slightly pubescent. 
Head transversely impressed towards the front ; prothorax broader than long, broadest about the middle, 
the sides rounded, feebly emarginate before the obtuse hind angles, and a little narrowed in front and 
behind, anterior angles a little produced, base subtruncate, the surface with scattered fine indistinct 
raised points, and with a smooth central line; elytra much flattened to beyond the middle, abruptly 
declivous behind, gradually widening from the base to beyond the middle, then suddenly rounded with the 
apex a little produced, very feebly emarginate behind the obtuse humeral angles, base narrower than the 
prothorax, and almost truncate, with a marginal ridge starting from the shoulder and turning off towards 
