1871.) 33 
sembles Anchomenus albipes. It is probable that A. elegans, Dej. (Sp., 
v, 725), belongs also to the genus; but A. dimidiaticornis, Dej., is most 
likely a small species of Oxycrepis (Feronine). 
AMPHITHASUS TRUNCATUS, n. sp.—Piceo-niger, glaber, epistomate, labro, 
palpis, pedibus, antennarumque articulis sex basalibus flavo-testaceis, 7—11 
albis ; capite levi, oculis vix prominentibus ; thorace capite cum oculis paulo 
latiorr, elongato-cordato, postice modice haud abrupte coarctato, supra convexo, 
levi, marginibus anticis et posticis grosse punctatis ; elytris oblongis, apice late 
obtuse truncatis, valde convexis, profunde striatis, striis concinne regulariter 
punctatis, interstitiis impunctatis ; abdomine rufo-piceo. 
Long. 34 lin. ; lat. elytr. 14 lin, 
Ega, Upper Amazons.* 
Genus ANcHONODERUS, Reiche. 
Few modern genera have been introduced in a more confused man- 
ner than the present. It was placed near Anchomenus by its author, 
and the long definition omits its most distinguishing characters. The 
type species cited, Platynus elegans (Brullé), cannot be separated from 
Lachnophorus, and the second and third species quoted by the author 
flatly contradict his generic characters “elytra apice rotundata, haud 
sinuosa, interstitiis granulatis,’ both those species being described by 
Dejean as having smooth interstices, and (at least, the first) sinuated 
elytra. The genus need not be withdrawn on account of the type be- 
longing to a previously described and still maintained genus, as some of 
the species included in it (binotatus, subeneus, rugatus, &c.) form a well- 
defined group, distinguished from Lachnophorus by the much less pro- 
minent eyes, rounded apex of the elytra without trace of truncature, 
and by the less fusiform shape of the terminal joint of the palpi. 
— ANCHONODERUS SUBTILIS, n. sp.—A. subcenco (Reiche) similis, magis de- 
pressus, oculis majoribus, elytris minus profunde striatis. Piceo-niger, sub- 
nitidus ; antennis rufo-testaceis, articulo basali, palpis, pedibusque flavo-testa- 
ceis ; capite thorace latiort, supra levi ; oculis magnis ; thorace cordato, postice 
minus quam in A. subceneo angustato, angulis posticis productis, supra sub- 
tilissime coriaceo ; elytris parum convewis, haud profunde, acute striatis, strivs 
via punctulatis, interstitiis vix convexis, sub-tilissime confuse punctulatis, mar- 
ginibus tenurter rufescentibus. Long. 34 lin. 
Guatemala. One example in Mr. BH. Brown’s collection. In the 
finely-impressed and almost impunctate strie it agrees with A. unicolor 
of Chaudoir, which, however, has black legs. It has great general re- 
semblance to the common A. subeneus of Columbia and Central America. 
* Except when otherwise stated, the new species are described from examples in my own 
collection.—H. W. B. 
