NORTH AMERICAN COLEOPTERA. 271 



closely punctate, smoother at sides and apex, surface with slight igneous lustre. 

 Body beneath piceous black, shining; abdomen with a few scattered punctures 

 with short hairs. Legs piceous, the bases of the anterior and middle femora 

 usually paler. Length .14 — .18 inch.; 3.5 — 4.5 mm. 



The sexual characters of the male are similar to those of hudsonias, 

 but the middle lobe is rather longer and the longitudinal impression 

 extends the entire length of the segment. 



A very easily known species, which shows no variation, except in 

 size. The ante-basal impression is, however, in some specimens en- 

 tirely obliterated. 



Occurs in southwestern Texas. 



S. senilis Say. — Moderately elongate and convex, occiput piceous, thorax 

 fuscotestaceous, elytra bright blue. Antennse slender, half as long as the body, 

 brownish, the basal joints paler. Head smooth, occiput piceous, front and mouth 

 pale. Thorax nearly twice as wide at middle as long, not narrowed in front, 

 sides regularly arcuate, slightly sinuate posteriorly, the hind angles slightly 

 prominent as in tasniata, disc convex, a vague ante-basal impression, surface mi- 

 nutely alutaceous, punctuation very minute and sparse, color pale brownish 

 testaceous, a vague darker cloud each side. Elytra distinctly wider at base than 

 the thorax, humeri oittuse, umbone distinct, limited within by a slight depres- 

 sion, color bright blue, shinina, moderately closely punctate, epipleurse pale. 

 Prothorax beneath and legs rufotestaceous, posterior femora darker. Metaster- 

 num piceous. Abdomen brown, sparsely punctate and slightly pubescent. 

 Length .14 — .16 inch.; 3.5 — 4 mm. 



The last ventral of the male is broadly truncate and flattened. 



This insect with Malacosoma fmcula Lee. were made the represen- 

 tatives of a new genus — Luperaltica — by Crotch, which was defined 

 in such a manner that it cannot contain either, and must therefore 

 be dropped from our literature. As the form and coloration resem- 

 ble 8. coltaris it is rather remarkable that the affinities of senilis 

 should have escaped Crotch. 



Occurs from Pennsylvania to Illinois. 



S. siibtciiea Lee. — Form oblong, ratlier more oval than hudsonias, moder- 

 ately convex, piceous, with very distinct feneous surface lustre, head and thorax 

 brownish. Antennse half as long as the body, rufotestaceons, two basal joints 

 darker. Head brownish, coarsely not closely punctate, front paler. Thorax 

 one-third wider than long, not narrow at apex, widest one third from apex, sides 

 moderately arcuate, margin very narrow, front angles obliquely truncate, disc 

 moderately convex, ante-basal impression not evident, surface coarsely, deeply 

 and moderatt^ly closely punctate. Elj-tra scarcely wider at base than the thorax 

 humeri obtusely rounded, disc more finely and densely punctured than the tho- 

 rax. Body beneath piceous, abdomen alutaceous, sparsely punctate. Legs tes- 

 taceous, posterior femora brown. Length .14 — .16 inch.; 3.5 — 4 mm. 



