278 STAPHYLINIDA. 
deeply transversely impressed at the base, and with some coarse punctures in the 
depression, elsewhere almost impunctate, or rather with but few and indistinct 
punctures. 
Although this insect has more the appearance of an Ocala or a Calodera than of the 
other species of Silusa, still I have not been able to detect any reason for placing it 
elsewhere than in this genus; the ligula appears to be elongate and quite linear. Only 
two individuals have been found. 
8. Silusa parvula. 
Minor, ferruginea, nitida, parce punctata, parum pubescens, antennis tibiisque fusco-rufis, illis basi et apice 
testaceis ; capite, thorace abdomineque fere glabris, elytris parce punctatis. 
Long. 23 millim. 
Hab. Guatemata, Calderas (Champion). 
Antenne rather short, a good deal thickened outwardly ; the two basal joints yellow, 
the others obscure red, the terminal joint being again paler; third joint rather shorter 
than the second ; fourth about as long as broad ; fifth scarcely, tenth strongly transverse ; 
terminal joint moderately large. Head rather broad, but a good deal narrower than 
the elytra. Thorax strongly transverse, narrower than the elytra, nearly straight at the 
sides, shining, and but very little punctate, without basal impression. Elytra rather 
short, but longer than the thorax, rather sparingly and not finely punctate, the colour 
a little more obscure behind towards the outer angles. Hind body rather broad, almost 
impunctate. 
Of this obscure species only a single, badly preserved, individual has been found; the 
diminished punctuation and pubescence readily distinguish it from the other Central- 
American Siluse. 
EUVIRA. 
Caput exsertum, collo brevi et sat angusto. Coxe intermedie parum distantes sed haud contigus, haud magne, 
acetabulis posterius sat argutis. Tibie tarsique tenues. 
The above brief characters will not apply to any other genus of the Aleocharin 
having like these insects four joints on the front and middle, five on the posterior, feet. 
Autalia and Eudera appear to be the genera to which Euvira comes nearest, but it is 
very distinct from either, the former genus having the mesosternum with a free raised 
edge behind, and the middle acetabula quite indefinite, and Eudera possessing widely 
separated middle coxe. The insects of this new genus are very minute, and possess a 
very short prothorax, shaped somewhat as in Oligota; the sides of the prothorax are 
not abruptly inflexed, and the prosternum is small; the head is truncate behind; the 
trophi I cannot see clearly, but they appear not to be remarkable. The antenne are 
short and thickened towards the extremity. The hind tarsi are very slender, but not 
very long; their basal joint is elongate, about equal to the two following together. 
