AMERICAN COLEOPTERA. 11 



TABLE OF SPECIES. 



Upper surface pubescent or hairy 2. 



Upper surface glabrous, or virtually so 7. 



2. Head with occipital smooth space, sides of prothorax sinuate ante- 



teriorly, the front angles prominent and acute, punctuation 

 of elytra extremely dense. 



Pubescence of upper surface fulvous, dense and moderately long 

 on the head and prothorax, shorter on the elytra posteriorly. 



l. sordida. 



Pubescence of upper surface sparser, grayish, erect, but excess- 

 ively short throughout 2. rugosiodes. 



Head without occipital smooth space, sides of prothorax not or 

 scarcely sinuate anteriorly, the angles not at all, or but 

 slightly prominent ; punctuation of elytra normal 3. 



3. Labrum deeply impressed or bilobed, pubescence long, fine, erect; 



ventral segments margined at sides — at least in part; strial 

 punctures of elytra nude. 



Ventral segments completely margined; clypeal angles well de- 

 fined but not dentiform, there being no distinct external 

 sinuation; prothorax rather densely punctate and some- 

 what uneven; size smaller (6-8 mm.), color varying from 

 black to brown 3. mimosa?. 



Ventral segments 1-3 margined at sides; clypeal angles dentiform 

 or subdentiform, the external sinuation distinct; prothorax 

 less closely punctate, the surface not evidently uneven; 

 size usually larger (7-10 mm.), color brown or reddish brown. 



4. popino. 

 Clypeal angles not dentiform, the margin squarely truncate at 

 middle with faint trace of median sinuation but no ex- 

 ternal sinus; prothorax still less closely but more coarsely 

 punctate; pubescence sparser; length 8 mm.; color brown. 



5. cribrulosa. 



Labrum feebly or mode'rately arcuate emarginate, pubescence 



short, ventral segments not margined at sides except in 



arizonica 4. 



4. Clypeal angles dentiform, the external sinuation strong; strial 



punctures of elytra setiferous, like those of the intervals. 

 Pubescence erect; thorax widest near the middle; size smaller 



(7-8 mm.) 6. arizonica. 



Pubescence recumbent; thorax widest at base; size larger (11- 



12 mm.) 7. boAvditclii. 



Clypeal angles not dentiform, no external sinuation 5. 



.5. Tooth of claw subapical, but little shorter than the superior por- 

 tion of the claw. 



TRANS. AM. ENT. SOC, XXXV. JANUARY, 1909. 



