268 (May, 
The head and mandibles are of the same form as in Pericompus. The 
thorax is very convex, cordate and greatly constricted behind, forming 
a narrow waist to the body. The elytra are destitute of striz, even 
the marginal and sub-marginal strie being deficient. The apical 
striola, however, so characteristic of the Tachys and Trechus groups, 
is well developed, and is connected with a trace of the sutural stria at 
the apex; between the two is an elongate impression, simulating a 
second striola. 
LIOTACHYS ANTENNATUS, n. sp.—ufo-testaceus, nitidus, pedibus palli- 
dioribus ; elytris leviter infuscatis, basi maculaque utrinque subapicali rufo- 
testaceis ; antennis art. 1—6 fuscis (1—2 pallidioribus), 7—11 albis. 
Long. 1% lin. 
Santarem, Amazons; on muddy banks of pools. In my own 
collection and that of Mr. Grut. 
TACHYS HNEOPICEUS, n. sp.— Oblongus, convexiusculus, eneo-piceus, 
palpis antennisque basi et pedibus flavo-testaceis ; capite sulcis frontalibus 
fortibus, postice extus valde curvatis ; thorace valde transverso, postice 
modice attenuato, angulis posticis productis, acutis, sulco basali margine 
paralello, integro, prope angulos fovea levi, extus sine carina; elytris 
elongato-ovatis, striis quingue punctatis impressis suturali excepta apicem 
haud attingentibus, stria marginali profunda, integra; striatertia punctis 
majoribus setiferis duobus. Long. 13 lin. 5 exempl. 
Banks of River Tapajos. In some specimens the brassy-green 
colour is dark and brilliant, but the piceous ground colour is always 
visible on the sides. 
TACHYS PLATYDERUS, n. sp.—Oblongo-ovatus, convexiusculus, rufo- 
testaceus, antennis basi pedibusque flavo-testaceis ; capite sulcis frontalibus 
postice extus curvatis ; thorace latissimo, postice modice attenuato, angulis 
posticis productis, acutis, basi utrinque fortiter sinuato, stria dorsali prope 
basin in fovea profunda desinenti, bast utringue sulco transversali et prope 
angulum plica elevata levi; elytris breviter ovatis, striis utringue duabus 
solum distinctis vie punctulatis, in loco strié tertie punctis majoribus 
duobus, striis marginalibus et sub-marginalibus prope apicem fortiter 
impressis et curvatis. Long. 1 lin. 4 exempl. 
Ega and Santarem, Amazons. 
TACHYS FRATERCULUS, n. 8p.—Z. platydero proxime affnis, differt 
striis elytrorum utrinque tribus distinctis fortiter punctatis; rufo-testaceus, 
elytris medvo indistincte infuscatis ; thorace transverso, angulis posticiz 
