CETONIIN^ 375 



metallic; head not quite so large, the vertex and clypeus nearly as 

 deeply concave, the vertex with fine, irregularly contiguous annuli, 

 wanting along the middle and without evident intermingled 

 punctures, the line between it and the clypeus somewhat less 

 elevated than in caviceps, the clypeal apex broadly arcuate, its 

 median sinus feeble; prothorax nearly similar but shorter and with 

 the two median prominences more parallel and less diverging 

 posteriorly, the sides much less angularly prominent before the 

 middle, the sculpture nearly similar; scutellum as in caviceps; 

 elytra oblong, a fourth longer than wide, a third wider than the 

 prothorax, much less obtusely rounded behind but with nearly 

 similar sculpture; pygidium nearly similar; hind tarsi rather 

 shorter and less stout. Length (3 cf) 19.0-23.0 mm.; width 9.5- 

 12.3 mm. Locality nearly as in the preceding, .lacustrina n. subsp. 

 5 Male oblong or oblong-oval, rather depressed, rufo-piceous in color, 

 the upper surface with more or less feeble metallic glint; head moder- 

 ate, with prominent eyes, the vertex rather deeply concave, it and 

 the clypeus with very close sculpture of fine interlacing lines and 

 some small scattered punctures, the transverse line between them 

 barely visibly tumescent; clypeus strongly reflexed and broadly 

 rounded at apex; prothorax large, strongly convex, fully a third 

 wider than long, the sides rather prominent before the middle, thence 

 converging and arcuate to the apex and less oblique and straight to 

 the obtuse but not rounded basal angles; surface with a large deep 

 transverse concavity before the middle, with its anterior margin 

 transversely prominent and cariniform except laterally, continued 

 posteriorly for a short distance deeply, and almost to the base, more 

 shallowly, by a medial impression; punctures in about anterior half 

 rather strong and moderately close, crescentic and bearing coarse 

 yellow hairs, becoming basally very fine sparse and nude; scutellum 

 large, triangular, with scattered moderate punctures; elytra a fourth 

 longer than wide, parallel, broadly arcuate at the sides and rounded 

 at apex, two-fifths wider than the prothorax; surface feebly and sub- 

 evenly convex, smooth, with fine sparse punctulation arranged in 

 part linearly internally; a transverse incised line at each side from 

 the suture just behind the scutellum is generally evident; pygidium 

 large, evenly and strongly convex, with fine feeble sparse crescentic 

 punctures arranged concentrically in a way wholly different from 

 that of scabra, the surface not modified or impressed at base; legs 

 moderately long; hind tarsi three-fourths as long as the tibiae, 

 moniliform; anterior tibiae as in scabra. Length 25.8-29.2 mm.; 

 width 13.3-15.0 mm. Eleven examples. 



Female a little shorter and stouter than the male, similar in color 

 and lustre; head a little smaller, with notably less prominent eyes, 

 the upper surface flat, coarsely and densely punctato-rugose, ex- 

 cepting a small, transversely arcuate subbasal space, which is smooth; 

 clypeus not reflexed at tip and broadly rounded; antennae as in the 

 male, thick, with a small oval club; prothorax relatively smaller, 

 less transverse, hexagonal, moderately convex, with a transverse 

 deep impression before the middle, which is smaller and not so deep 



