June 1900.] Casey: On North American Coleoptera. 71 



Molamba, gen now 



The species are much more numerous than those of Saciiim and are 

 generally of smaller size, though obesum is as large as any representa- 

 tive of that genus discovered thus far. Those before me may be con- 

 veniently arranged as follows: — 



Elytra uniform in coloration or devoid of distinctly defined pale maculation 2 



Elytra dark in color, with rufous or flavous maculation 3 



2 — Pubescence long, distinct and rather abundant ; body large, piceous, the pronotum 

 pale anteriorly, but darker at the middle as usual ; punctures fine, rather close-set ; 

 elytra distinctly longer than wide, sometimes very feebly rufescent behind the 

 middle in a small area but not obviously so. Length 1. 9 mm.; width 1. 2 mm. 

 Cal i fornia o besa , sp. no v. 



Pubescence virtually wanting, each of the very minute sparse punctures having an ex- 

 ceedingly minute hair, only visible under high power, the surface polished ; body 

 much smaller, black, the pronotum piceous-brown, with two apical albescent 

 areas ; elytra perfectly uniform black, scarcely longer than wide, the abdomen 

 much extended behind them in the single type. Length (to extremity of elytra), 

 i.omm.; width 0.7 mm. Texas (Columbus) speculates, sp. nov. 



3— Elytra each with a small pale spot on the median line well behind the middle 4 



Elytra with a transverse pale band, sometimes failing to attain the sides or interrupted 

 at the suture 6 



4 — The pale spot nubilate ; elytra black or paler from immaturity ; punctures fine and 

 moderately close, the vestiture distinct. Length 1.3-1.6 mm.; width 0.8-0.9 

 mm. Colorado and Utah, one specimen not specifically distinguishable labeled 

 " New York." biguttata Lee. 



The pale spot clearly defined ; size smaller 5 



5 — Antennae moderately long, nearly as in amabilis ; punctures fine, rather sparse, tlit 

 pubescence distinct ; metasternum finely but distinctly punctured and with short 

 and stiffer hairs. Length 1.I-I.3 ram.; width 0.7-0.8 mm. Massachusetts 

 and Maryland to Iowa and Missouri lunata Lee. 



Antenna; very short, the club moderate but as long as the entire preceding part omit- 

 ting the basal joint ; body almost exactly as in htnata but much smaller, the meta- 

 sternum more minutely punctured but with longer and finer hairs. Length 

 0.8S mm.; width 0.6 mm. Florida (Lake Monroe) parvula, sp. nov. 



6 —The pale band at the middle of the length consisting of a transverse discal spot on 

 each, the elytra each with two large subconfluent basal spots also ; pubescence 

 dense and conspicuous, the color piceous ; pronotum darker along the median 

 line. Length 1.5 mm.; width o.S mm. Texas lepida Lee. 



The pale band just visibly behind the middle and formed as in lepida, the body 

 throughout as in that species but wholly devoid of pale spots at the elytral base ; 

 punctures minute but rather close-set. Length I.4-I.6 mm.; width o.S- 

 0.85 mm. Iowa ornata, sp. nov. 



The pale band much behind the middle, more conspicuous and attaining the sides of 

 the elytra 7 



7 — The pale band nubilously interrupted at the suture ; body nearly as in the two pre- 



