276 RHYNCHOPHORA. 
but weaker sculpture, appearing smoother, with a short impressed punctured striga on either side of the 
base of the suture; apical declivity less oblique, the impressed portion shallower, narrower, scarcely visibly 
punctured, the elevated sutural borders without a trace of tuberculation, the callose sides less elevated, 
with similar tubercles, and fewer and shorter hairs. Anterior tibie broader and more distinctly spinose. 
Underside rufescent. 
Hab. Panama, Volcan de Chiriqui (Champion). 
There seems no reason for doubting that this species, represented by one example, 
though very like P. wmbrinum, is distinct from it, as the difference in the localities 
suggests. The same probability cannot be assumed in the case of the following 
species, which is closely allied to both the preceding, particularly P. consimile. 
8. Pterocyclon difficile, sp. n. 
Fem. Statura, magnitudine, sculptura P. consimili 2 simillima; differt colore, fronte nitida ad latera crebre 
- grosse punctata, antennarum clava ovali, margine superiore usque ad apicem densius fimbriato, elytris 
proportione brevioribus, posterius minus angustatis, tuberculis in ambitu declivitatis a sutura #que 
remotis. 
Long. 3 millim. 
Female. Allied to the two preceding species, particularly P. consimile. Entirely piceous-black, with the legs 
and antenne testaceous-brown. Head very shining in front, strongly and closely punctured, the punctures 
deep and confluent near the eyes, the median line shining, subcarinate ; antennal club ovate, not truncate, 
with a well-marked fringe along its entire upper border. Prothorax if anything a little broader, especially 
towards the base, and more strongly rounded at the apex, not otherwise different. Elytra only one-fourth 
longer than the prothorax, with the sides straight and not or scarcely narrowed behind, the apical margins 
more obtuse than in the two preceding species, appearing subtruncate when seen from above; surface 
sculptured as in P. consimile, with the strige at the base of the suture rather shallower ; declivity broader, 
subvertical, less produced forward above, the impression along the suture broader, quite impunctate, the 
spines of the lateral callosities equidistant from the suture. Underside fuscous-black, the abdomen 
rufescent. 
Hab. Panama, Volcan de Chiriqui (Champion). 
One specimen. The differences in the structure of the antennal club and in the 
frontal sculpture between this and the preceding form compel their reference to 
distinct species, in spite of their common origin, unless they should prove to be sexes 
of the same. ‘This is unlikely, and if it be the case it will involve the rejection of the 
ciliate antennal club as a constant sexual character, one which appears to be valid as 
far as it has been at present tested. 
9. Pterocyclon luctuosum, sp. n. 
Mas. Oblongus, subnitidus, piceo-niger, elytrorum apice subrufescente, antennis et pedibus ferrugineo- 
testaceis ; prothorace antice elliptice rotundato, posterius cum elytris subtilissime punctulato; his ad 
apicem obtuse singulatim rotundatis, declivitate subexcavata, breviter obcordata, ambitu lateraliter 
subacuto, utrinque bituberculato. 
Long. 2°3 millim. 
Male. Oblong, subcylindrical, scarcely elongate, rather shining, black, the elytra slightly rufescent towards 
the apex. Forehead subconvex, with rather close strong punctuation, moderately shining, duller 
and subimpressed over the mouth, the latter fringed with a few hairs; antennz testaceous-brown, the 
