OOLEOPTERA. 
53 
Ptychoderes tricostifrons, Sch. 
Modice elongatus , corpore infra lateribusque crassiusculis , supra anguste 
sat deplanatus; niger , tomento infra albido-sericeo , <iorso thoracis 
elytrorumque in vitta lata communi irregulari determinatam albido- 
subrosescente , lateribus brunneo-ferrugineis tecto ; maculis punctisque 
ordinariis disci obscure brunneo-ferrugineis ; rostro capiteque modice 
elongatis , illius carinis dorsalibus argute elevatis , hoc evidenter 
bi-carinato , parum convexo ; thorace lato , latitudine paullo longiore , 
lateribus modice rotundatis , medio disci per impressionem intra 
apicalem et depressionem antebasalem transversim elevato , utrinque 
crassatim oblique inclinata , carina postica medio anguste interrupta ; 
scutello transverso, breviter ovato; elytris basi singulatim sub-trun- 
catis, conjunctim levissime emarginatis, margine medio latiore , 
rejlexo , supra modice sed anguste deplanatis , longitrorsum parum 
convexis, postice usque callum oblique declivibus , callo ante-apicali 
basi lato , conico, libellam perpendicularem apicis perpendicularis 
excedente ($), aut solum attingente ($). 
Majores: Antennis corpore paullo longioribus, parum eras sis. 
$ Mediocres: Antennis corpore aut paullo longioribus , 
vioribus. 
$ Duplo minores : Antennis thoracis basin haud superantibus. 
$ Antennis medium thoracis superantibus , clava latiore brevioreque quam 
in $ minimis. 
Longit. (rostr. incl.) 8—11 lin. = 17f g —25 nrillim. 
Latit. hum. If—2§ lin. = 4—6 millim. 
Ptych. tricostifrons (Chevr.), Sch. loc. cit. t. v., p. 1, pag. 158. 
Patria : Mexico, Dom. Salle, &c. 
To the Schonherrian description and the above characters I have to 
add, that this species is broader, shorter and more convex than the three 
preceding. The body, thicker beneath and at the sides of the thorax 
and elytra, has exactly the same distribution of tomentosity, except that 
the sides of the thorax and elytra are of a brown-ferruginous, sometimes 
chocolate hue, the common band of the discus is perhaps more rosy, but 
evidently narrower on the thorax than in Pt. Columbianus , more narrowed 
