COLEOPTERA. 
117 
developed specimens, for, as I have observed, these organs would vary, 
as in the male Ptychoderes , according to the degree of development 
of the individuals. Both species have a common character, uniting them 
more closely together ; the lateral spiniform tubercles of the base and the 
apex of the elytra. 
Genus GYMNOGNATHUS, Sch. 
Gymnognathus vicinus, Jekel. 
Oblongus , piceus, tomento obscure brunneo tectus ; tibiarum maxima 
parte tarsisque nigro-tomentosis ; rostri capitisque linea suboculari , 
thoracis linea media integra lineolaque basali utrinque disci , linea 
laterali obliqua alteraque infera prope anteque pedes anti cos, scutello , 
elytrorum plaga communi longitudinali tripartita mox ante apicem 
terminata , puncto apicali lineolisque duabus marginalibus , pygulii 
marginibus , pectoris lateribus basi apiceque segmentorumque abdomi¬ 
nis lateribus apice Jlavescenti-albo squamosis ; rostro thorace paullo 
breviore , medio carinato , late cinnabarino vittato ; thorace parum 
conico , latitudine multo longiore , convexo , subtubulato; elytris 
leviter punctato-substriatis, dorso deplanatis, thorace parum latioribus 
dimidioque longioribus ; pygidio latitudine parum longiore , conico , 
apice truncato , angulis haud spinosis. 
$ Antennis longioribus , thoracis medium subattingentibus , rostro tho- 
raceque paullo longioribus. 
£ Antennis brevioribus , basin thoracis parum superantibus , rostro tho- 
raceque paullo brevioribus. 
Longit. (rostr. pygid. excl.) maxim, indiv. lin. = 7f g millim. 
Latit. hum. 1^ lin. = 3 millim. 
Patria : Amazona, Para, Dom. Bates. 
Very close to Gymn. dorsonotatus, Sch., but proportionally less elon¬ 
gate, especially in the rostrum and thorax, this latter being in the males, 
broader, thicker, shorter, more conic and convex than that of the female 
of that species; the longitudinal band of the rostrum is broader, of a fine 
cinnabarine hue: the antennae are thicker: the thorax has its posterior 
carina farther from the base, and there is, besides the five whitish lines, 
