498 STAPHYLINIDA. 
10. Somoleptus elegans. 
Angustior, nigricans, subeneo-micans, nitidus ; antennis pedibusque piceis; capite angusto, oblongo-ovali, sat 
fortiter punctato; elytris ad basin dense subtiliter rugoso-punctatis ; abdomine apicem versus latiore. 
Long. 5 millim. 
Hab. Guatema.a, Balheu (Champion). 
Although allied to S. pallipes in appearance and in the punctuation of the wing- 
cases, this species is distinguished by some minor characters. The antenne and legs are 
darker in colour, the head is rather less rounded at the sides and hind angles, and the 
punctuation is a little coarser, so that, although only a single example has been 
obtained, I believe it will prove to be a distinct species. 
11. Somoleptus alticola. 
Nigro-piceus, nitidus, tarsis dilutioribus ; elytris quam thorax multo brevioribus, abdomine apicem versus latiore. 
Long. 5 millim. 
Hab. Guatemata, Totonicapam between 8500 and 10,500 feet (Champion). 
Head oblong-oval, very shining, almost impunctate. Thorax elongate, almost elliptic 
in form, rather sparingly and indistinctly, but not minutely, punctured, with a broad 
space along the middle impunctate. Elytra much shorter than the thorax, narrower at 
the shoulders than at the apex, very indistinctly and sparingly punctulate, very shining. 
Hind body broad behind, narrower towards the base. 
Only one example has been obtained of this very distinct species. 
12. Somoleptus agreeformis. (Tab. XIII. fig. 7.) 
Angustior, gracilis, nitidus, rufescens; elytris abdomineque apicem versus fuscescentibus, pedibus pallide 
testaceis ; capite ovali, vertice rotundato, cumque thorace obsolete punctulato, 
Long. 43 millim. 
Hab. Mexico (Flohr). 
This species is readily distinguished by the form of the head, which is not at all 
truncate behind. The thorax is very elongate, appears straight at the sides till near 
the front, thence much narrowed forwards; like the head very indistinctly punctulate. 
Elytra parallel-sided, scarcely so long as the thorax, indistinctly punctulate. 
The special locality of the two examples, for which we are indebted to Mr. Flohr 
has not been recorded. 
THYREOCEPHALUS. 
Thyreocephalus, Guérin, Rev. Zool. 1844, p. 10. 
This genus should be accepted, as it cannot be united either with Xantholinus or 
Scytalinus ; the peculiar form of the head and thorax, the remarkable mandibles, the 
widely separated antennz, the wide labrum, the presence of both marginal lines of the 
