AMERICAN rOLEOPTERA. 45 



curve, striae deep ptinctured, less distinct towards the base, marginal and sub- 

 marginal striaj very deep, confluent at the anterior fifth, dorsal punctures 

 three; scutellar stria distinct. Length 5.5 — 7 mm; .22 — .28 inch. 



San Diego, California; Mr. Ulke. A singular insect, quite diflfer- 

 ent in form froiu all others of the genus, and suggestive of a flat 

 elongate Bembidium of the Peri/phus group. 



The frontal striae are long and deep, the eyes uot very prominent, 

 tho'igh convex ; the 6th and 7th striae of the elytra are shorter and, 

 more obliterated in front than the others; the antennae are pubescent, 

 with the first two joints and half of the third shining and glabrous. 

 In five specimens, kindly loaned to me, I observe no tarsal differences 

 worthy of mention. 



/*. tpznnun Chaud., is very different in appearance from the two 

 above described. Tt is a short, robust, convex species of metallic 

 blackish-green color, with the hind angles of the prothorax rectangu- 

 lar but not carinate, and the base, each side, with two feeble foveas. 

 The striae of the elytra are faint, only the inner ones being distinct, 

 and they are distinctly punctured in front, finer and smoother behind ; 

 the marginal and submarginal striae are confluent in front, but the 

 latter is nearly obsolete except towards the tip, wliere it is deep. 

 Body beneath blackish brown, legs testaceous. The general appear- 

 ance is that of Bradi/cellus nitiilua. 



I owe my specimen of this rare insect to the liberality of Baron 

 Chaudoir, who. although having but two specimens in his cabinet, has 

 divided them with me in order to make one of them accessible to 

 American .students. 



HYDROSCAPHA, n.g. {TTydroscnphidce.) 

 Head moderately large, eyes lateral coarsely granulated somewhat 

 transverse ; antennae scarcely longer than the head, inserted under the 

 edge of the front, with seven distinct joints; 1st stouter, 2d and Hd 

 each as long as the 1st, but narrower, 4 — 6 together shorter than 2d 

 and 3d united, gradually wider, 7th about as h-ng as the 2d and Hd 

 united, elongate oval, scarcely wider than the 6th, with an indistinct 

 transverse suture near the base, and another very near the tip, which 

 is subacute. 



Labrum transverse, rounded in front concealing the mandibles. 

 Maxillae large at the base (lobes not examined), maxillary palpi less 

 than half as long as the antennae, Ist and fourth joints long, 2d and 

 3d united equal to either of the others, not dilated; mentura trapezoi- 



