North AmeiHcan Species of Trogoplilmus. 329 



Second antennal joint slightly shorter than the third.. 1 caloderinus 

 Second antennal joint longer than the third. 



Dark ferruginous, legs pale ; antennae without distinct sexual dififer- 



ences 3 arcifer 



Black, legs and antennae black ; sexual differences in the antennae 

 very marked. 

 Prothorax less transverse, widest before the middle. 



3 antliracinus 

 Prothorax more distinctly transverse, widest at the middle. 



4 corTinus 



t. T. caloderinus Lee— Trans. Am. Ent. Soc, VI., p. 246. 



The original description will amply serve for the recognition 

 -of this very distinct species, but it may be well to state that the 

 disk of the prothorax is polished^ the punctures being excessively 

 fine, sparse, and feeble, and almost completely obsolete, except 

 between the arcuate basal impression and the base, and thence 

 laterally and anteriorly near the sides in basal two-thirds, where 

 they are coarse, deep, and conspicuous. The body is rather 

 more robust and convex than in the other species of the group. 

 The fourth joint of the maxillary palpi is very short and slender, 

 but is not by any means obsolete, as supposed by Dr. Le Conte. 



Several specimens collected by Mr. Schwarz at Columbus, 

 Texas, are very immature, and seemed on a casual examination 

 to indicate a distinct and much more depressed form, showing to 

 how great an extent mere immaturity may alter the appearance 

 of these species. 



2. T. arcifer Lee— Trans. Am. Ent. Soc, VI., p. 245.— Moderately 

 robust and couvex, dark rufous; head, and abdomen toward apex clouded 

 slightly with piceous ; legs and antennae pale fuscous, the latter flavate 

 at base ; pubescence rather long, coarse and dense, nearly erect, rather 

 conspicuous ; integuments shining. Head scarcely more than three- 

 fourths as wide as the prothorax, feebly convex, coarsely, deeply and 

 xather sparsely punctate ; interspaces convex and polished ; prominences 

 moderate in size, distinct ; eyes large, convex, and rather prominent, 

 the tempora behind them very short, strongly rounded and not at all pro- 

 minent ; antennae distinctly longer than the head and prothorax, 

 slender, very feebly incrassate; second joint slightly but distinctly longer 

 than the third, the latter obconical, twice as long as wide, fourth slightly 

 longer than wide, with the sides nearly parallel, tenth one-third wider 

 than long. Prothorax nearly one-half wider than long, widest a little 

 before the middle, where the sides are strongly rounded and obtusely 



ANNALS N. Y. ACAD. OF SCI., IV. Issued March, 1889. 



