60 CATALOGUE OF THE INSECTS OF 



hoc dorso foveolis duahus suh-ohlongis, parum profundis 

 impresso, basin versus suhangustato, margine laterali non 

 explanato. Long. 1 — 1^ lin. 

 Sublinear, of the size of 0. exiguum, to whicli it is nearly allied, 

 but the head and thorax are less deeply impressed, and the elytra 

 less deeply punctured; with the foveae of 0. rivulare. Black, 

 shining. Antennae of the length of the head and thorax, slightly 

 thickened towards the apex, 9th and 10th joints sub-transverse, 

 the last rather larger, abruptly acuminate ; black, or nigro-piceous 

 in the middle. Palpi nigro-piceous. Head rather flattish, thickly 

 and rather finely punctate, two deepish rounded foveas behind 

 between the eyes, and two approximating more obsolete sublinear 

 impressions anteriorly between the base of the antennae, the apex 

 of the head not smooth. Thorax transverse, subquadrate, of the 

 shape of that of 0. rivulare, considerably narrower than the elytra, 

 nearly one half of their breadth at the apex, thickly and finely 

 punctate as in the head; the sides slightly, the anterior angles 

 considerably rounded, slightly narrowest towards the base, base 

 truncate, posterior angles nearly right angled ; slightly convex 

 transversely, the back with two sub-arcuate, rather shallow, sub- 

 oblong foveae, widest and deepest behind, narrowing and vanishing 

 in front, with a third obverse-lanceolate, more obsolete, interme- 

 diate foveae at the apex, and the trace of a fourth triangular, 

 still more shallow one at the base before the scutellum; sides 

 anteriorly narrowly margined, at the middle, on each side, rather 

 strongly impressed, by which means a triangular flattened space 

 is formed at each of the posterior angles Scutellum smooth. 

 Elytra more than double the length of the thorax, sometimes 

 widest externally, lateral margin very narrow, exterior angles 

 rounded; not quite flat, slightly longitudinally depressed on each 

 side along the suture, and at the base near the shoulders; very 

 thickly and rather strongly punctate, concolorous, or slightly 

 fuscous. Abdomen very obsoletely punctulate, rather dull. Legs 

 testaceous, the femora sometimes dusky. 



Very nearly allied to 0. ccesum, Erich., 0. oxyacanthoe, Gy 11., 

 which appears to be more opaque, and has the sides of the thorax 

 flattened out. 



