746 STAPHYLINIDA. 
4. Omalium atomarium. 
Omalium atomarium, Fauv. Bull. Soc. Linn. Normand. x. p. 16°; Notices ent. lil. p. 8°. 
Hab. Mexico, Teapa (Pilate1*)?; Guaremana, Yzabal (Sadlé), Zapote, El Reposo 
(Champion). 
Fauvel !2 gives as the only locality “ Teapa, Mexique (Pilate), collection de M. A. 
Sallé et la mienne.” The two examples of A. atomarium, Fauv., in M. Sallé’s collection 
are, however, from Guatemala, and the Mexican habitat therefore requires con- 
firmation. 
5. Omalium pumilio. 
Depressum, omnino peropacum, obsoletissime vix perspicue punctatum, subtilius pubescens ; fusco-nigricans, 
pedibus testaceis. 
Long. 2-23 millim. 
Hab. GuateMmaua, Capetillo (Champion). 
This species is readily distinguished by the extremely opaque surface, without 
definite punctuation ; there are scarcely any traces of impressions on the thorax, the 
hind angles of which are sharply defined and slightly obtuse. The male has a gentle 
emargination of the hind margin of the last ventral plate. Four examples. 
6. Omalium faustum. 
Depressum, omnino peropacum, obsoletissime vix perspicue punctatum, subtilissime pubescens; nigricans, 
pedibus sordide testaceis ; prothorace convexiusculo, minus fortiter transverso. 
Long. 17-27 millim. 
Hab. Panama, Bugaba (Champion). 
This insect is extremely close to O. pumilio, but is rather smaller and narrower, and 
presents several other slight differences. The antennz are short, with the joints 6-10 
transverse. The thorax is rather narrow, and not so strongly transverse, and a little 
narrower in front than in the allied species. ‘The elytra are short, scarcely one and a 
half times so long as the thorax. Twelve examples. 
7. Omalium incultum. 
Depressum, opacum; fusco-ferrugineum, antennis extrorsum nigris, pedibus testaceis; prothorace fere 
impunctato, dorso late, parum argute, bi-impresso ; elytris dense punctatis. 
Long. 3-37 millim. 
Hab. GuateMaLa, Quiche Mountains 7000 to 9000 feet (Champion). 
A broad and short, very depressed insect, distinguished from the other Omalia of our 
region by the bi-impressed but impunctate thorax, and by the densely punctate elytra. 
The thorax has a slightly sinuous outline, and the hind angles are obtuse though 
distinctly marked; the elytra are not quite so long as the thorax. The male has an 
emargination of the hind margin of the last ventral segment. ‘Ten specimens. 
