COLEOPTERA. 
63 
Ptychoderes viridanus, Sell. 
Parum elongatus , sat convexus , supra hand deplanatus , niger , tomento 
infra Icete luteo-virescente , supra viridi-olivescente tectus; maculis 
ordinariis disci viridi-fuscescentibus; rostro brevi , 6asi transversim 
leviter impresso; capite lato , in fronte convexiusculo , pone oculos 
parum extenso; thorace latiusculo , longitudine angustiore , lateribus 
ab apice ad carinam posticam subrotundatim amplialo, disco ante 
medium leviter, supra basin profundius , impresso ; scutello paullo 
transverso, subquadrato ; elytris basi conjunctim emarginato-truncatis , 
margine paullo elevato , pro humeris parum obliquis rotundatisque sat 
ampliatis , lateribus versus apicem parum angustatis, supra disco 
anguste leviterque deplanatis , posterius semicirculariter declivibus, 
callo ante-apicali nullo ; abdominis segmentis omnibus basi utrinque 
macula subquadrata obscure viridi-olivescente ornatis. 
$ 9 Majores: Dorso elytrorum scepissime obsolete albido -irrorato, 
macula media emarginaturce obsoletiore; $ antennis longitudine 
corporis , crassiusculis , articulis subcylindricis , apice breviter 
leviterque clavatis , ^ antennis longis , carina postica thoracis 
subattingentibus. 
$ 5 Subduplo minores: Dorso elytrorum magis albido-irrorato, macula 
media posticaque evidentioribus, obscurius viridibus; $ antennis 
apicem pectoris hand attingentibus, tenuiusculis (Ptycb. fuscatus, 
Chevrolat in litt .—sob r in us ? Dey. C«£.) 
Longit. (vostr. incl.) 7 —10 lin. = 16—22 millim. 
Latit. hum. If—2§ lin. = 4—6 millim. 
Ptychod. viridanus, Sch. Gen. et Sp. Curcul. t. i. pars i. p. 121; t. v. 
p. i. pag. 158. 
Patria; Brasilia, sec. Dom. Sch. (erroneous P ); Cayenna, Dom. Dupont, 
Chevrolat, &c.; Amazonae, Para, Dom. Bates. 
This species is, with Pt. callosus, mixtus and obsoletus , among the 
thickest and most convex of the genus, being thicker than the two latter, 
but rather less so than the former, though perhaps less depressed along the 
suture, and certainly like Pt. obsoletus , less depressed in that part, the 
depression being extremely shallow. It is also amongst the broadest and 
