June 1900.] Casey : On North American Coleoptera. 73 



narrowly at the sides to the base ; integuments polished ; under surface blackish, 

 the legs pale. Length 1.2 mm.; width 0.75 mm. Virginia (Fort Monroe). 



cinctus, sp. nov. 



Elytra pale piceous-brown, the entire external limb flavescent, broadening over the 

 humeral regions ; body narrowly oblong-oval ; under surface pale, the legs flavate. 

 Length I.omm.; width 0.65 mm. Florida (Tampa) mollinus Sthz. 



5 — Pubescence. of the elytra moderately abundant and quite distinct, the hairs coarse ; 

 elytra blackish, the pale band broad, sinuate anteriorly at the suture ; pionotum and 

 legs pale. Length 0.62-0. 7 mm.; width 0.42-0.48 mm. California. 



scitulus Lee. 



Pubescence almost wholly wanting, each of the very minute sparse punctures bearing 

 an extremely minute hair only visible under high power ; surface polished, the 

 elytra piceous, the band transverse ; pronotum pale, clouded with piceous at the 

 middle of the disk. Length 0.8 mm.; width 0.45 mm. Florida (Tampa). 



splendens Schz. 



6 — Elytra highly polished, without trace of reticulation 7 



Elytra minutely reticulate, the punctures minute and less visible ; pubescence short 

 but rather abundant and quite distinct ; body pale luteo-flavate in color throughout, 

 the elytra sometimes slightly darker. Length 0.7-0.8 mm.; width 0.4-0.53 mm. 

 California and Iowa. \Sacium ealifornieiun Mattb.] decolor Lee. 



7 — Punctures small but strong and distinct throughout above, quite close-set, the 

 pubescence moderately long and abundant, coarse and very distinct ; color black- 

 ish, the pronotum paler. Length 0.95 mm.; width 0.65 mm. Massachusetts 

 and Pennsylvania m isel 1 u S Lee. 



Punctures minute and sparse, scarcely visible except under high power, each bearing 

 an exceedingly minute hair as in splendens, blackish, the pronotum paler, the 

 apical whitish spots small and rather widely separated. Length 0.8 mm.; width 

 0.55 mm. Texas (Columbus) sparsus, sp. nov. 



There may be some closely allied species included in the material 

 before me which is referred to decolor, but in any event they would be 

 so doubtfully distinct that there could be no advantage gained in 

 separating them ; there can be little or no doubt of its identity with the 

 Sacium californicum, of Matthews. 



The antennae in Arthrolips occasionally appear to have only nine 

 joints, the slightly elongate third joint followed by three instead of 

 four minute joints, but this appearance may be due simply to the diffi- 

 culty in observing these organs in their natural position. 



^Enigmaticini. 



The general habitus of the few species comprising this tribe is 

 wholly different from that of the preceding tribes, the body being 

 narrow and somewhat as in Corticaria. There has been but one 

 genus characterized thus far : 



