42 MEMOIRS ON THE COLEOPTERA 



truncate, the oblique sides nearly straight; antennae rather long, the 

 third joint fully as long as the next two, the club elongate and well- 

 developed though evidently shorter than the funicle; prothorax 

 much less than half as long as the elytra and much more than twice 

 as wide as long; elytra obviously longer than wide, the series obsolete 

 basally, the ground reticulation also wholly obsolete basally and, 

 elsewhere, less pronounced in the lines of punctures than between 

 them, the punctures shallow and lunate, becoming larger and de- 

 cidedly deeper postero-laterad; metasternal process broad, circularly 

 rounded at tip and not very coarsely beaded. Length 1.65-2.1 mm.; 

 width 1.0-1.3 nun. Arizona (Sta. Rita Mts. and elsewhere). Many 

 examples arizonicus n. sp. 



16 Elytral punctures of the usual type but narrower, more rounded and 

 arranged in even series traceable almost to the basal margin; later- 

 ally they are not materially wider; the series are regular and with the 

 puncture? rather close-set, the general ground sculpture micro- 

 reticulate throughout, though extremely feebly so, the reticulations 

 relatively rather large, the surface very highly polished throughout. 

 Legs piceo-rufous; head minutely but rather deeply punctate, dis- 

 tinctly less than half as wide as the prothorax, the antennae well 

 developed, the third joint equal to the next two, the club much 

 shorter than the funicle but of the same type as in the preceding 

 species; prothorax much more than twice as wide as long and much 

 less than half as long as the elytra, the medio-basal margin finer 

 and more bead-like than usual; scutellum three-fourths wider than 

 long; metasternal process broadly arcuate and beaded at apex; 

 general form of the body broad and oblong-oval, broadly rounded at 

 apex. Length 1.9 mm.; width 1.33 mm. Colorado (Garland). 



seriatus Lee. 



Elytral punctures extremely shallow, lunate, becoming much wider but 

 still more feeble postero-laterad, the general ground sculpture more 

 minutely and strongly micro-reticulate throughout from apex to 

 base 17 



17 Third antennal joint shorter than the next two combined. Body 

 very small, the sculpture and general outline throughout nearly as in 

 politus and also with the very broad metasternal process circularly 

 rounded and broadly beaded at apex as in that species, but with the 

 prosternal process narrower, not more than a third as wide as the 

 metasternal; under surface piceous, the legs and antennae testaceous- 

 yellow; eleventh antennal joint but little longer than the two 

 preceding together. Length 1.4 mm. Georgia LeConte. Char- 

 acters drawn from description of the writer (Ann. N. Y. Acad., V, 

 p. i oo) pumilio Lee. 



Third antennal joint as long as the next two combined ; metasternal process 

 very broad, extending beyond the coxae, its apex circularly rounded; 

 prosternal process also wider than usual; eleventh antennal joint 

 large and long, with a compressed apical lobe, the basal part alone 

 fully as long as the two preceding joints combined; body generally 

 larger, though very variable in size 18 



1 8 Metasternal process with the apical bead notably broad and nearly 



