160 WILLIAM G. DIETZ, M.D. 



founded with the next. The above description corresponds with a 

 specimen in Dr. Horn's collection bearing the specific name, and 

 also with the description given by Casey of this species, except as it 

 relates to the beak in the male, which certainly does not correspond 

 with any of the male specimens before me. Dr. LeConte's descrip- 

 tion is defective and misleading, the terms " robust," and " protho- 

 rax densely and coarsely punctured," do not apply here, nor is any 

 reference more to the reddish color of the elytra. 



S. coininixtus n. sp. — Very similar in form, color, scaly vestiture and 

 formation of claws to the preceding species, fi'om which it differs as follows: 

 prothorax distinctly wider than long, strongly rounded on the sides, narrowed 

 anteriorly and distinctly constricted at the apex, less densely punctured, inter- 

 spaces shining; the elytral setpe are very small, scarcely visible. Length 2.5 — 

 2.75 mm.; 0.10—0.11 inch. 



Hah. — Montana. 



Section II. 



By far the larger number of species of the present subgenus are 

 comprised in this section. The articulating surfaces of the posterior 

 tibise are not freely exposed when viewed externally, generally ter- 

 minal or exposed posteriorly. According to differences in the 

 formation of the antennal funicle and rostrum I have arranged the 

 species into three groups as follows: 



Beak distinctly curved, Plate viii fig. 23. 

 Second joint of funicle distinctly longer than the third, generally elongate. 



Corniculatus Group. 

 Second joint of funicle not or scarcely longer than the third, never elongate. 



Plate vii; fig. 24 Obtectus Group. 



Beak straight. Plate vii't fig. 23a Griseiis Group. 



Corniculatus Group. 



With the exception of the last three species, the members of this 

 group are quite homologous, moderately stout, convex insects. The 

 beak distinctly curved, second joint of funicle longer than the third. 

 They are closely related and difficult to distinguish. With more 

 extensive series some of the species may prove to be mere varieties, 

 while some forms here considered as varieties may be entitled to rank 

 as species. 



With these prefatory remarks I offer the following table for the 

 separation of the species : 



