1873.] OlO [Horn. 



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

 hif/ens. 



The forms identical with the European occur in the entire Atlantic 

 region, and also in California; cmnmunis is, Canadian, and interceptus 

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

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



S. Belirensii, n. sp. 



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

 brown. Head finely puuctulate. Thorax s^jarsely punctulate, piuictures 

 at sides denser and toward the base coarser. Elytra with the fii'st 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 otrias finely impressed ; surface nroderately coai'sely but 

 sparsely punctured at the apical third, the punctui-es not extending 

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

 middle. Pygidium and propygidiam moderately punctured. Prosternal 

 striiB strongly convergent in front and uniting before the apex, ijroster- 

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

 tibire finely multidenticulate, middle and hind tibise uniseriately spiuu" 

 lose. Length .14 inch ; 3.5 mm. 



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

 verging and united strise forbid its position in this group. The proster- 

 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 rotuiidntua than in any other species of the genus. The 

 genus G)ii(t7ioncu3 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., 1863, p. 477, pi. 12, fig. 36. 



Oval, modei'ately 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 striaj and near 

 the suture ; subhumeral stria; 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 tibiaj spinulose. Prosternal striie 

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

 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 



