536 Guleopterological Notices^ VI. 



large, moderatel}' convex, not attaining the base; antennae much 

 shorter than the prothorax, rapidly' incrassate, the penultimate 

 joints strongly transverse and asj'mmetric. Prothorax one- 

 fourth wider than long, feebly narrowed from base to apex, with 

 the sides just visibl}- arcuate, slightly serrate anteriorly, the apical 

 angles broadl}^ rounded and obliterated ; basal angles also broadly 

 rounded and undefined ; disk rather finely but strongly, somewhat 

 close!}' punctured especialh' toward the sides. Elytra large^ 

 three-fifths longer than wide, one-tliird wider than the prothorax, 

 parallel, feebl}- inflated behind, the apex almost semi-circularly 

 rounded ; punctures moderately coarse, strong and rather close- 

 set. Abdomen sparsely clothed with longer decumbent cinereous 

 pubescence. Length 3.9 ram.; width 1.6 mm, 



Arizona. This species is allied to longicollis, but differs, when 

 compared with the corresponding sex, in having the erect hairs 

 of the elytra sparser and black, and the short hairs shorter, 

 coarser, posteriori}' bent and more decumbent. The male is prob- 

 abl}' narrower than the female described above, and with a more 

 elongate and more strongly serrate prothorax. 



SYDATOPSIS 11. gen. 



Aberrant antennal structure constitutes the chief differential 

 feature of this genus, nearly all the other characters being essen- 

 tially those of Trichochrous. The antennae in the male are dis- 

 tinctl}' longer than the head and prothorax combined, rather nar- 

 row and not incrassate, the joints strongly serriform, longer than 

 wide, strongly narrowed toward base and clothed sparsely with 

 long pale hairs, the eleventh narrower than the tenth, elongate 

 and pointed toward base and apex from the middle, the fifth very 

 slightly dilated. The ungual appendages are long and well de- 

 veloped. 



1. S. longicoriiis n. sp. — Oblong, strongly convex, polished, black, the 

 elytra feebly icueo-piceous, with the apical margin jjale; abtlomen slightly 

 pale at tip; legs pale riifo-ferruginous throughout; antennte pale testaceous, 

 the eleventh joint somewhat obscure; pubescence rather long, coarse, dense 

 and pale luteo-ciuereous, intermingled with numerous long erect and bristling 

 pale setse, which are mixed Avith a few black hairs anteriorly; marginal cilia 

 long, bristling and irregular, pale in color. Head barely three-fourths as wide 

 as the prothorax, convex, strongly, densely and rugosely punctate, smooth to- 

 ward the middle anteriorly, the impressions obsolete; epistoma long, impunc- 

 tate and gradually pale; labruni long, pale and strongly rounded; eyes moder- 



