1872.] 201 
postice recte vix angustato, antice vie rotundato, angulis posticis obtusis ; 
elytris ad apicem late rotundatis, supra striis sex viv impressis, 8°" postice 
flexuosd, acute insculptd ; antennis robustis, apicem versts sub-clavatis ; 
tarsis angustioribus. Long. 2 lin. 
Extremely near JL. levigatus, differing in the elytra being more 
distinctly striated, and the disc of the thorax on each side not being 
black. I have compared two examples of each. The tarsi (especially 
the posterior) are much more slender than in the typical species, and 
are but slightly pabescent above; but the mentum is decidedly toothed, 
and the species belongs therefore rather to Mizotrechus than to T’re- 
chicus. 
Rio Janeiro, Brazil, at Tejuco. From the collection of the Rev. H. 
Clark. 
Genus LACHNACES, nov. gen. 
Gen. Olisthopo vel Badistro similis sed gen. Eucero vere affinis. 
Corpus lete sericeo-iridescens. Caput triangulare, postice modice angus- 
tatum; oculis magnis, prominulis, fronte vix bi-impressd.  Labrum 
elongatum, quadratum, antice leviter sinuato-truncatum.  Mandibule 
elongate, ad apicem graciles, falcate. Palpi valde elongati, pubescentia 
densé& vestiti, articulo ultimo elongato, apice acuminato, precedenti multo 
grossiori. Antenne valde elongate, filiformes, graciles, articulis 8—11 
pubescentiad densa vestitis. Mentum haud profunde emarginatum, medio 
breviter obtuse (vel haud) dentatum. Thorax transversus, baseos medio 
anguste lobato. lytra fortiter striata, ad apicem obtuse late rotundata ; 
margine basaii et humerali explanato-productis, striold basali nulld, 
interstitio 3° tri-punctato, strid@ marginali per apicem continuatd. 
G Tarsi antici articulis tribus fortiter dilatatis, 1” elongato-triangulari ; 
2—8 elongato-cordatis, subtus bi-seriatim squamosis. 
The curious little Carabide forming this genus, have somewhat 
the facies of Olisthopus, with the strong iridescent gloss of the Loxandri, 
near which I had placed them; but the densely pubescent and acu- 
minate palpi and lobed thorax show their near relationship with 
Eucerus, next to which the genus must henceforth be ranged. The 
palpi are extremely long, the second and third joints of the maxillary 
especially so; the fourth is also elongated, but of an elongate ovate 
shape, with gradually pointed tip. 
LLACHNACES SERICEUS, ”. sp. 
Oblongus, latus, piceo-niger, letissime sericeo-iridescens, oris partibus, 
antennarumque articulis 4 basalibus (ceteris pallidioribus) rufo-testaceis ; 
thorace valde transverso, lateribus equaliter forliter rotundatis, angulis 
