64 RHYNCHOPHORA. 
I do not find anything agreeing with Gerstacker’s description among our specimens ; 
it is probable, however, that A. chalceum is allied to A. oscillator. 
38. Apion oscillator, sp. n. 
Nigrum, supra fere nudum, subnitidum ; rostro mediocri, cylindrico, curvato, polito; prothorace dense fortiter- 
que punctato ; elytris sat profunde sulcatis, interstitiis nitidis ; pedibus fere nigris, tibiis piceo-testaceis. 
Long. 2 millim. 
Hab. Mexico, Frontera in Tabasco (//ége). 
Rostrum as long as the head and thorax, curved, cylindrical, polished; head short ; 
eyes convex, moderately widely separated, the space between them obsoletely trisulcate ; 
antennee inserted close to the base. Thorax rather short, very coarsely punctate, with 
a short fovea in front of the base. Elytra rather deeply sulcate, the sulci very coarsely 
punctate and bearing some very minute white sete, the interstices shining, subconvex. 
Under surface with white pubescence outside the middle coxe and along the sides of 
the metasternum ; intermediate coxe moderately distant. Legs slender. 
This species would be naturally placed next A. guatemalenum ; but it has the tibie 
pallid, though only obscurely so, the antennze inserted close to the base of the rostrum, 
and the thorax densely and coarsely punctured, so that it is unmistakably distinct from 
its ally placed in the first division. The fact that the sete are placed in the grooves 
of the elytra and not on the interstices distinguishes it from most other species, but 
unfortunately they are very minute and are detected only by careful observation. Four 
specimens were obtained, of uncertain sex. 
39. Apion acarinum, sp. n. 
Minutum, obesulum, nigrum, peropacum, tenuiter griseo-pubescens ; antennis pedibusque rufo-testaceis ; rostro 
parvo, interdum picescente vel flavescente ; prothorace brevi, minus argute punctato; elytris profunde 
sulcatis. 
Long. 14 millim. 
Hab. GuateMALA, Senahu (Champion). 
Rostrum small, smooth in front of the insertion of the antenne, which is quite basal ; 
eyes convex, the space between them punctured and dull; antenne yellow, short, about 
as long as the rostrum, the second joint globular. Thorax strongly transverse, 
narrowed in front, its punctuation indistinct and rather distant, but not fine. Elytra 
somewhat deeply sulcate, the interstices rather narrow, not quite flat. Middle coxe 
moderately separated. 
This tiny Apion is of somewhat unusual proportions, the hinder portion of the body 
being large and obese in comparison with the small anterior parts. Mr. Champion 
procured a good series of examples, but I cannot find any sexual characters to distin- 
guish them. ‘Lhe colour of the rostrum appears to be variable, passing from nearly 
black to yellow; but most of the specimens are intermediate in this respect, so that 
I do not think it can be a mark of the sexes. 
