70 Journal New York Entomological Society. [Voi. vin. 



These genera are all widely distributed over the continent, but Sa- 

 cittm has not yet been found near the Pacific coast line, although 

 occurring in Utah ; it is more northern in habitat than the other two. 

 Molainba may perhaps prove to be the same as Paiiiuihis, but at pres- 

 ent I have no means of determining this. 



Previous authors aiipear to have entirely overlooked the very con- 

 spicuous vertical ligula at the hind margin of the buccal opening in 

 Saciiiin and Molamba, a character wholly wanting in Arthrolips. 



Sacium Lcc. 

 In this genus, and the next, the limb of the pronotum is broadly 

 retlexo-explanate antero-laterally, and is scarcely at all so at the mid- 

 dle of the apical margin, while in Arthrolips the edge seems to be 

 more narrowly and evenly reflexed throughout the external circumfer- 

 ence. Saciui/i, as understood by Mr. Matthews in the " Monograph," 

 is composite, and higubre should have been assumed as the type. The 

 genus includes some of the largest species of the family known to 

 me, and the four represented in my cabinet may be thus defined in 

 brief: — 



Prothorax as long as wide or very nearly ; elylral punctures and pubescence rather 

 sparse 2 



Prothorax shorter and more transverse, much wider than long in both sexes ; elytral 

 punctures and pubescence dense 4 



2 — Elongate, twice as long as wide or very nearly, the elytral punctures smaller and 

 rather sparser, piceous to blackish in color, with the usual two pale patches at 

 the apex of the pronotum. Length 1.75-2. i mm.; width 0.9-1.0 mm. Colo- 

 rado montanum, sp. nov. 



Less elongate, always distinctly less than twice as long as wide, the elytral punctures 

 stronger and less sparse 3 



3 — Piceous in color to blackish, the elytral suture sometimes slightly paler. Length 

 1.6-1.S mm.; width 0.85-0.9 mm. Lake Superior lugubre Lee. 



Deep black, the suture not paler ; body a little larger and relatively broader. Length 

 1.7-2.0 mm.; width I.o-I.l mm. Utah (southwestern) nigrum, sp. nov. 



4 — Body rather smaller, piceous-brown in color, the under surface and legs still paler. 

 Length 1.65 mm.; width 0.S5 mm. Lake Superior obscurum Lcc. 



The elytra are uniform in color throughout and there is an entire 

 absence of the paler maculation so characteristic of the two following 

 genera. 



The genus represented by Clypcastcr >naderie Kr. (^piisilliis Woll., 

 necGyll.) is radically distinct from Sacium in the structure of the an- 

 tenna; as figured by AVollaston, and 1 would propose the generic name 

 Clypeastodes for that species . 



