114 LENG AND HAMILTON. 



The arrangement of tlie genera as stated above is that of the 

 *' Classification," and incorporates the recent notes of Dr. Horn and 

 Messrs. Bates and Gahan. 



ACAIVTHODERES Serville. 

 Body ahove maculate with white pubescence. 

 Sutural region of elytra vaguely grooved, the groove limited on each elytron 

 by a feeble costa. 

 Elytra with moderately broad ti-ansverse baud of white in front of middle 



broadly interrupted at the suture quaclrigibbiiw. 



Sutural region not grooved. 



Elytra with moderately broad oblique space of whitish pubescence extending 



from the humeri to the suture peiiiiiNiilHriw. 



Elytra without whitish space, but with a distinct M-shaped black mark behind 

 the middle on each. 

 Base of elytra in-egular, an oblong obtuse umbone at middle of base. 



Smaller species (Ie<-ipiens. 



Base of elytra regularly convex, without umbone. Larger species. 



inorrisii. 

 Body above not maculate, elytra with black setse wickhaini. 



A. qiiadrigibbus Say, 1835 {Acanthocimis), Bost. Journ. i. 195; Lee, ed. ii, 

 ()f)o; Lee, Jour. Acad. Nat. Sci. ser. 2, ii, 175; himaculatus Mels.. Cat. No. 

 758. 

 Length 10 mm. ; .40 inch. Habitat. — Massachusetts. New York, New Jersey. 

 Pennsylvania, Ohio, North Carolina, Louisiana, Arizona. 



A. peninsiilaris Horn. Tr. Am. Ent. Soc. 1880. viii. 116. 

 Length 12-l()mni.: .48-. 64 inch. Habitat. — Lower California. 



A. decipiens Hald., 1847 [Aegomorphns), Tr. Am. Phil. Soc. x, 45; Lee, .Tour. 

 Acad. Nat. Sci. ser. 2, ii, 176. 

 Length 12 mm. : .48 inch. Habitat. —Massachusetts, New York, New Jersey, 

 Pennsylvania, Virginia, Georgia, Louisiana, Nebraska, Ohio, Canada, Maine. 



A. uiorrisii Uhler, 1855, Proc. Ac. vii, p. 417; lencogentis Thorns., 1868, Physis. 

 i, 6, 1). 148. 

 Length 20 mm ; .80 inch. Habitat. — Missouri, Pennsylvania, Canada. 



A. wickhaini n. sp. 



Length 10-12 mm. ; .40-.48 inch. Habitat. — Southern Arizona. 



Several specimens taken under the leaves of Opuntia (Cactus) in 

 the Tucson Mountains by Mr. H. F. Wickhani, to whom I take 

 much pleasure in dedicating this species. 



Form moderately robust, above slightly depressed, color nearly black, body and 

 elvtra sparingly clothed with short black hair. Head closely punctulate, a few 

 coarse punctures intermingled, pubescence very sparse. Eyes coarsely granulate, 

 emarginate in front; antenna brownish piceous, as long as the body % , the scape 

 clavate, second joint short, third slightly longer than fourtli, 4-11 gradually lon- 

 ger; each Joint beyond the second finely i)ubescent and hearing at ajjcx three or 



