1S73.] OLO [Horn. 



here is not nearly so great as has been long known in pensylvanicus and 

 lugens. 



The forms identical with the European occur in the entire Atlantic 

 region, and also in California; communis is Canadian, and intercept as 

 from California and Oregon. An examination of Marseul's type of com- 

 munis convinces me of the absolute identity of it with rotundatus. 



S. Behrensii, n. sp. 



Broadly oval, piceous black, shining. Antennae and legs reddish- 

 brown. Head finely punctulate. Thorax sparsely punctulate, punctures 

 at sides denser and toward the base coarser. Elytra with the first dorsal 

 extending three-fourths the length of the elytra, second, third and fourth 

 equal extending beyond the middle, the fourth broadly arching at base 

 and joining the sutural which extends nearly to the apex, subhumeral 

 obsolete, humeral distinct and close to the first dorsal ; epipleural fold 

 with two striae finely impressed ; surface moderately coarsely but 

 sparsely punctured at the apical third, the punctures not extending 

 beyond the first dorsal, and at the suture extending slightly in front of 

 middle. Pygidium and propygidium moderately punctured. Prosternal 

 striae strongly convergent in front and uniting before the apex, prester- 

 num not narrowed in front and on each side a small fovea. Anterior 

 tibiae finely nmltidenticulate, middle and hind tibiae uniseriately spinu - 

 lose. Length .14 inch ; 3.5 mm. 



The appearance of this species agrees with Group IV., but the con- 

 verging and united striae forbid its position in this group. The prester- 

 num in front is not narrowed as in its preceding species. This narrowing 

 is caused by the extension of the antennal fossa, which thus becomes 

 more anterior in rotundatus than in any other species of the genus. The 

 genus Gnathoncus proposed by Duval for the species allied to rotundatus 

 does not seem worthy of being retained. This species was sent me by 

 Mr. Jas. Behrens from San Diego, California. 



S. planisternus, Mars. Mon., 1802, p. 477, pi. 12, fig. 36. 



Oval, moderately convex, surface shining, with distinct bronze lustre, 

 legs brownish. Head sparsely punctulate. Thorax with the margin 

 smooth, a short submarginal stria beginning in a shallow fossa near the 

 anterior angle, and within the stria the surface sparsely punctured. 

 Elytra sparsely punctured at apex beyond the tips of the striae and near 

 the suture ; subhumeral striae entirely absent, oblique humeral very fine ; 

 first dorsal extending slightly beyond the middle, 2-3-4 subequal extend- 

 ing to three-fourths, fourth dorsal arching at base joining the sutural 

 which is entire. Propygidium and pygidium sparsely punctured, the 

 latter more finely. Anterior tibiae with the apical three teeth coarse, the 

 upper three finer, middle and hind tibiae spinulose. Prosternal striae 

 gradually convergent and uniting in front near the tip of the presternum. 

 Length .15 inch ; 3.75 mm. 



This species is one of the most distinct in our fauna. The thoracic 

 sculpture is peculiar. Near the apical angle and equi-distant from the 



