226 STAPHYLINIDA. 
1. Tachyusa sparsa. 
Gracilis, nigra, nitida, sparsim subtilissime punctulata et pubescens, antennis fuscis, pedibus fusco-testaceis ; 
prothorace quam elytra angustiore, basin versus leviter angustato, ante scutellum obsolete impresso ; ab- 
domine segmentis basalibus ad basin profunde transversim depressis. 
Long. 3 millim. 
Hab. Muxico (Truqui, coll. Sallé and Sharp); Guatema.a, Quiche Mountains 7000 
to 9000 feet (Champion). 
Antenne rather short, third joint about equal to the second, the penultimate joints 
transverse. Head and thorax very sparingly punctate. Elytra slightly longer than the 
thorax, rather more distinctly punctulate and pubescent. Hind body very sparingly 
pubescent and punctulate. 
I have seen but four specimens of the species, all in very dilapidated condition; the 
individual in M. Sallé’s collection was, from its style of mounting, evidently one of 
Truqui’s captures. The solitary example from Guatemala has lost its antenne, and is 
of rather darker colour and more elongate form. 
The species may be distinguished from the species of Gnypeta by the more sparingly 
pubescent upper surface. The middle coxee are less separated; and the mesosternal 
process is quite slender, and is separated by an elongate space from the obscure termi- 
nation of the metasternal process, the posterior margin of the coxal cavities being 
excessively indistinct. 
2. Tachyusa seticornis. 
Nigra, sparsim subtilissime punctulata et pubescens, antennis fuscis, pedibus fusco-testaceis ; capite thoraceque 
opaculis, impressis ; elytris abdomineque nitidulis. 
Long. 3; millim. 
Hab. Mexico (Truqui, coll. Sallé and Sharp). 
Antenne rather elongate; third joint somewhat curvate internally, equal in length 
to the second; fourth larger than the following ones, slightly dilated, and furnished 
inwardly with four slender, erect, elongate black sete, the penultimate joint rather. 
strongly transverse. Head broad, the surface flat, and somewhat depressed, excessively 
minutely punctulate, so that the surface appears dull. Thorax with similar sculpture 
to the head, narrower than the elytra, narrowed behind, flattened and broadly impressed 
on the middle. Elytra but little longer than the thorax, sparingly and very finely 
punctate and pubescent, shining. Hind body sparingly punctate, shining, the basal 
segments deeply transversely impressed. 
I have seen but three individuals, in very fragmentary condition ; they are probably 
all males, the terminal ventral plate being a good deal produced ; and it is likely that 
the peculiarity of the antennal structure may also be sexual. 
