NORTH AMERICAN COLEOPTERA. 45 



Distinguished from the preceding by the small size and evident 

 humeral angles. Widely distributed, but only occasional specimens from 

 each locality. 



A. robiistiiin u. sp. — Entirely black, antennae sometimes piceous. Head 

 finely canaliculate or continently punctured between the eyes; the latter not 

 prominent; basal joint of antennae longer than second and third combined, else 

 as before. Elytra twice as wide at base as base of thorax, wider behind middle, 

 humeri acute. Striae distinct punctures evident, intervals wide, flat. Beneatii 

 abdomen rather finely punctured. Length '■'< mm. 



Hdh. — Tex., Mo., Iowa. 



Larger than all others of this section, and hence easily distinguished. 

 The preceding is the only other species with evident humeri, and it is 

 scarcely more than one-half as large as this species. 



The four species of this section differ from all others known to me, Uy 

 the peculiar structure of the anterior femora, which seems not to occur 

 in any exotic species. 



Skction II. 

 The species of this section are more numerous, and closely resemble in 

 general appearance the preceding, while evidently distinct by the lack 

 of the femoral tubercle. Plate 8, fig. 1, shows the form of most species 

 in section, while a few approach figs. 10 and 15 ; j>»»/A//*a.s»?», j!)o?-rt?A'^»»j 

 and sordid II 111, are aberrant while evidently belonging here, and have 

 each a unique and easily recognized appearance. The species arc as 

 follows : 

 Humeri of elytra wanting. 



Rostrum dilated near base, elongate, slender, 2.5 mm proteiisum. 



Rostrum not dilated near base. 



Rostrum unusually stout and punctured, 1.4 mm piinctirostre. 



Rostrum elongate. 



Pubescent, very narrow, parallel, 1.5 parallel II in. 



Not pubescent. 



Elytral striae fine, intervals wide, flat. 

 Form very slender, thorax without impressed line 1.5 mm..estriatuili. 

 Form more robust, thorax with evident impressed line. 



Striae of elytra moderate, punctured. 2.5 ovale. 



Striae of elytra narrow, punctures obsolete, 2 mm. 



iinpuiict,i$«triatiiiii. 

 Elytral striae wide, intervals convex. 



Black, punctures of striae moderate, form convex. 1.5 mm. 



desolatiim. 

 Fulvo picoou;*, punctures of striae gross, form subdepressed, I mm. 



sordidiiiii. 

 Humeri of elytra evident. 



Rostrum not dilated near base. 



Eyes distinct, somewhat prominent, head wide. 



(12) 



