NO. 1988. STUDIES OF NORTE AMERICAN WEEVILS— PIERCE. 387 



bK Serial punctures small; hind tibiae very strongly bent near the apex in the 



male segnis LeConte. 



6^. Serial punctures much coarser; scales brilliantly metallic in color; hind 



tibiae of the male only very feebly arcuate toward apex lecontei Casey. 



d\ Serial punctures setigerous; elytral suture not keeled near the apex, but with 

 a small and abruptly-elevated double tubercle; scales in great part opales- 

 cent verrucifer Casey. 



II. Onlj'^ the first two or three funicular joints elongate, the remainder moniliform. 



3. Elytral intervals alternating in convexity. 



a'. Serial punctures setigerous; elytra not tuberculose; sutural prominence mod- 

 erate or feeble; all tibiae minutely denticulate debilis Casey. 



a~. Serial punctures squamigerous. 



c^ Anterior tibiae denticulate squamipunctatus Pierce. 



C-. All tibiae denticulate decoratus LeConte. 



4. Elytral intervals not alternating in convexity throughout their length; elytral 



suture not prominent or keeled near the summit of the posterior declivity; 

 serial punctures setigerous; prothorax densely tuberculate ursinus Horn. 



The species of this complex genus might be divided into two groups 

 on the basis of the antennal funicle, or the alternation of elytral 

 intervals, or the vestiture of the serial punctures, but obviously none 

 of these characters is of generic value. The antennal character most 

 nearly associates those of like appearance. The combinations of the 

 three characters above mentioned divide the genus into seven closely 

 associated groups of species. The writer feels that at present this is 

 the most satisfactory arrangement which can be given the genus. 



DYSLOBUS TUMIDUS Casey. 



Amnesia tumida Casey. 



The nasal plate is a poorly defined triangular depressed area. 



DYSLOBUS GRANICOLLIS LeConte. 



Amnesia granicollis Horn. 



To conform with Col. T. L. Casey's restrictions, only the Oregon, 

 Washington, and Vancouver material is to be placed here. The two 

 following species are so close that the writer does not believe they 

 should be kept separate. 



The nasal plate is a hemispherical, concave, depressed punctate, 

 poorly defmed area with emargiuate base. 



DYSLOBUS DISCORS Casey. 

 Amnesia discors Casey. 

 A single specimen from Los Gatos, California, may be assigned to 

 this species The nasal plate is as in the preceding species. 



DYSLOBUS SCULPTILIS Casey. 



Amnesia sculptilis Casey. 



Material from Eureka and Fieldbrook, California, may be assigned 

 to this species. The nasal plate is as in the preceding two species. 



