1871.] 79 
Euc@{Rus HILARIS, n. sp.—Gracilior, nigro-piceus, politus, labro 
palpis pedibusque flavo-testaceis, antennarum articulis 1—2 flavo-testaceis, 
3—7 fuscis, 8—11 albis ; thorace capite angustiori, cordato, postice sinu- 
atim angustato, angulis posticis explanatis, abrupte productis; elytris 
breviter ovatis, subtilissime striatis, utrinqgue prope basin macula trans- 
versa bilobata, alteraque postica rotundata suturali, fulvis, ornatis. 
Long. \§ lin. 1 exempl. 
The thorax is very similar in shape to that of E. geminatus, but 
much narrower, and the elytra are much shorter and rounder, besides 
being nearly smooth, the striz being visible only under a powerful lens. 
St. Paulo, Upper Amazons. 
Evcmrvus LEBIOIDES, n. sp.— EL. hilari simillimus ; nigro-piceus, 
politus, labro, palpis pedibusque flavo-testaceis, antennarum articulis 1—2 
flavo-testaceis, 3—T fuscis, 8—11 albis ; thorace capiti latitudine equali, 
cordato, postice valde sinuatim angustato, angulis posticis explanatis, pro- 
ductis; elytris breviter ovatis, subtilissime striatis, utringue prope basin 
guttis duabus (interiore majore) maculaque elongata postica suturali, fulvis, 
notatis. Long. 15 lin. 3 exempl. 
Distinguished from LH. hilaris only by its broader thorax, and the 
two separate rounded spots of the elytra. 
Banks of the Tapajos, at Santarem. In my own collection and 
that of Mr. Grut. 
Evc®RUS PULCHRIPENNIS, n. sp.— Gracillimus, speciebus Ege generis 
quibusdam similis ; rufo-testaceis nitidus, pedibus pallidioribus ; antenna- 
rum articulis \—3 rufo-testaceis, 4—6 fuscis, 7—11 albis ; capite supra 
convexo, levissimo ; thorace capite angustiori, anguste cordato, lateribus 
angustissime marginatis, basi constricto, angulis posticis haud prominulas, 
supra antice valde convexo ; elytris levibus, macula humerali vittaque 
deinde usque ad marginem posticum curvata, suturam attingenti, fuscts, 
ornatis. Long. 13 lin. 1 exempl. 
Banks of kK. Tapajos. Resembles Hga formicaria, especially in the 
shape of the head, which, however, is not constricted behind into a 
narrow neck, neither have the elytra the transverse depression char- 
acteristic of Hga and Chalybe; the thorax is also rather broader and 
shorter than in those genera. 
Genus CHALYBE. ; 
Castelnau, Etudes Entom., p. 92, 1835 (Calybe); Hist. Nat. Ins., i, 
156, 1840 (Chalybe). 
The examination of a series of species leads me to think this genus, 
