56 Orper—COLEOPTERA. Srection—PENTA MERA. 
(fig. 4c, subtus ; 4¢, lateraliter visum), parte basali multo angustiori stipitem formante (fig. 4d, mentum e eapite 
separatum et e parte postica visum) ; prothorax longitudine latitudinem fere wquante, lateribus rotundatis, angulis 
posticis subacutis (latitudine majori ante medium); epimera mesothoracica supra visa verticalia; proster- 
num spina parva setosa ante coxas anticas armatum ; mesosternum in triangulum acutum inter coxas medias 
nullo modo porrectum retro terminatum; pygidium rotundatum integrum; pedes subgraciles, tibiis anticis 
extus bidentatis subtus inermibus nec tuberculo conico instructis; tibie 4 postice spina brevi et caleari 
longiore intus ad apicem armate; tarsi 5-articulati, articulo basali in pedibus antieis paullo minore (fig. 47, 
apex tibie antice et tarsi, maris, ut videtur ; 4g, id. foemine spinis tibie2 majoribus); unguibus parvis ; abdomen in 
utroque sexu, ut videtur, subtus convexum. 
I have separated the insect on which this genus is proposed from the typical Cyclidii, on account of its 
small size, entirely sericeous covering, more slender legs (the anterior tibia being destitute of the triangular 
lobe on the under or inner surface), and the more regularly transversely ovate form of the mentum. 
Species 1 (85)—CYCLIDINUS LUGUBRIS. 
Prater XI, Fic. 4. 
Totus supra obscure luteo-pulverulentus, punctis nigris varius; prothorace vittis duabus angustis mediis, 
singula vitta in medio extus dilatata, nigris; capite et pronoto punctis parvis rotundis; elytris supra in medio 
fere planis, punctis oblongo-ovalibus parvis cicatricosis; antennis obscure fulvis; pedibus nigris rugosis, spira- 
culis duabus posticis conicis. 
Long. corp. lin. 7; lat. humer. elytr. lin. 3. 
Habitat; prope fluvium Amazon (Bates). In Mus. Hopeiano Oxoniz et Bates. 
Genus. 25—PSILOCNEMIS. 
(Burmeister, Handb. iii. 1842, p. 676. Cremastocheilus (pars), Schaum.) 
Cremastocheilo proximus, corpore fere levi nitido; clypeus valde dilatatus prope oculos latior ; antennarum 
articulus basalis triangularis ; maxille basi minus crassa; galea falciformi apice acutissimo ; mandone crassiori 
oblique acuminato (pl. I, fig. 4a); mentum maximum, caput antice infra tegens, basi valde angustum (fig. 4d, 
mentum intus, et 4¢, postice visum) ; parte antica lata planiuscula margine parum elevato, parte postica angulata 
integra, et sub jugulo extensa; prothorax lateribus rotundatis xqualibus ; tibie antice extus in medio fere, 
mutica, apice extus acuto (fig. 4/7), et supra basin tarsorum 5-articulatorum producto; prosternum spina obtusa 
setosa ante coxas antieas armatum; mesosternum haud prominens; abdomen maris segmentis 2, 3, et 4 ven- 
tralibus longitudinaliter impressis. 
The genus agrees with Cremastocheilus in the structure of the head and abdomen, and with Cyclidius in 
the legs and prothorax ; but, in the polished surface of the body, it differs from both those groups. 
Species 1 (86)—PSILOCNEMIS LEUCOSTICTA. 
Puate II, Fie. 4. 
Nigra, nitida: capitis margine antico paullo reflexo ; vertice inter antennas biimpresso ; pronoto elytrisque 
punctis vel striolis albis tomentoso-pilosis notatis ; prothoracis lateribus rotundatis, margine postico fere recto, ante 
marginem transversim biimpresso ; elytris longitudinaliter in medio subsuleatis, costaque elevata cum lateribus 
parallela, disco punctis subtriangularibus impresso. 
Long. corp. lin. 6; lat. elytr. bas. Tin. 3. 
Habitat ; North Carolina (?) (Zimmerman), Mexico (?). 
Syn.: Psilocnemis leucosticta. Burmeister, Handb. iii. p. 677, 1842. 
Psilocnemis polite. Schaum, Annales Soc. Ent. France, 1844 (id. 1845, p. 54), p- 397; Verz. Lam. Melit. 
p. 65. 
