CETONIIISLE 385 



and wider than the prothorax; punctures dense on the depressed 

 intervals, elsewhere rather strong but sparse, wanting on the opaque 

 lateral areas as usual, the post-scutellar lines of tomentum short, 

 the lateral fine, equal, not crossing the summit of the flanks; pygidium 

 (<?) but slightly wider than long, very convex, with long lateral 

 tomentose areas never extending across the base, the surface strongly 

 and acutely umbonate near the apex, the incised lines finely undu- 

 lated, not asperulate, widely separated, the very minute hairs sparse, 

 a little longer and closer toward the apex of the umbo; hind tarsi 

 compressed, two-thirds longer than the tibiae; anterior tibial teeth 

 apical and small but very acute. Length 9.7-11.7 mm.; width 5.0- 

 6.2 mm. Florida (Marion Co.). [Trichius rufobrunneus Csy.] 

 Twelve specimens all males and exhibiting no variation. 



rufobrunneus Csy. 



Color black, shining throughout, the abdomen feebly rufescent, the legs 

 slightly greenish in lustre; head and pronotum black, rarely with 

 faint greenish lustre; elytra black, the disk frequently more or less 

 rufescent, sometimes only in the depressed intervals, the lateral 

 opacity always black; pygidium piceous to rufescent; head and pro- 

 notum with small close punctures, frequently sparse toward the 

 hind angles and finer and denser throughout in the male; head barely 

 more than half as wide as the prothorax, the clypeal apex moderately 

 reflexed and much more gradually than in the preceding, the median 

 sinus very feeble and shallow, not comparing in any way with that 

 of texanus or allied forms; prothorax large, transverse, a fifth (a 71 ) 

 to two-fifths ( 9 ) wider than long, the angle at apical third very 

 obtuse and rounded, the apical obliquity straight; median line 

 broadly and feebly impressed; tomentose margins near the angles 

 usually distinct in the female; scutellum and elytra formed as in 

 the preceding and with similar sculpture, pubescence and tomentose 

 areas; pygidium (c?) throughout nearly as in rufobr2mneus, or 

 ( 9 ) larger, more transverse, evenly and less strongly convex but 

 similar otherwise to that of the male, the hairs barely longer, closer 

 or more visible, though closer toward tip. Length (i cf, 5 9) 

 9.3-11.8 mm.; width 4.9-6.4 mm. Florida (Jacksonville). Dis- 

 tinguishable readily from rufobrunneus by the different coloration 

 and larger, more transverse prothorax in both sexes; the tarsi are 

 not longer but more slender and less compressed in the male. 



[ Trichius obesulus Csy.] obesulus Csy. 



7 Elytra with areas of opacity on the flanks as in the piger section 

 preceding; pygidium ( 9 ) rounded at apex, always pubescent, with a 



subapical flattened and more pubescent area 8 



Elytra wholly devoid of opacity at the sides, the lateral tomentose spots 

 less developed as a rule and sometimes completely wanting as in 



bibens 1 1 



8 Body larger in size and stout 9 



Body small in size and more slender 10 



9 Color black, the elytra pale toward the suture; vestiture throughout 

 long, herissate, cinereous and conspicuous, sparse on the elytra, 

 T. L. Casey, Mem. Col. VI, Nov. 1915. 



