84 PROCEEDINGS OP THE ACADEMY OP 



margine reflexo, basi modice rotundato medio truncato elytris oblongis basi 

 late emarginatis, humeris rectis, striis punctatis, interstitiis planis vix rugulosis, 

 biseriatim subtiliter punctulatis, gula modice rugosa. Long. -23. 



California, one specimen ; Dr. Le Conte. Distinet from the preceding by its 

 smaller size, more depressed form, and less deeply punctured head and thorax. 

 Its color is light rufous, probably immature. The antennae in this species are 

 much shorter, and the joints much more globose, than in any other of this 

 group. The eighth joint is not as much smaller as in all the other American 

 Trogositas, exhibiting thus a relationship with Section A. 



5. T. pleuralis, nigro-picea depressa, capite thoraceque parce grosse 

 punctatis, hoc lateribus densiore punctatis et colore ferrugineis, antice la- 

 tiore postice angustato, lateribus modice rotundatis ante angulos modice 

 emarginatis, margine reflexo, basi rotundato, elytris oblongis, basi rectis, 

 striis punctatis, interstitiis planis rugulosis, biseriatim subtiliter punctulatis 

 punctatis, abdomine parce grosse punctate, gula prosternoque parce subtiliter 

 punctulatis, antennis pedibusque nigro ferrugineis. Long. -23 *30. 



California, two specimens ; Dr. Le Conte. This species is the most depressed 

 of this group, resembling the c o 1 1 a r i s, Sturm. The sides of the thor.ix and 

 anterior portion of the head are ferrugineous. The elytra are much wider in 

 proportion to their length than in any others of this group. 



6. T. li tubal is, brunnea, modice convexa, capite thoraceque dense punc- 

 tatis, hoc lateribus rotundatis, antice latiore, postice angustato, ante angulos vix 

 emarginatis, his acntis, margine reflexo, basi rotundato, elytris oblongis basi 

 late emarginatis humeris rectis, striis punctatis, interstitiis, planis, nitidis, 

 biseriatim subtiliter punctulatis, gula transverse plicata antennis pedibusque 

 pallidioribus Long. -22. 



T.limbalig, Mels. Proc. Acad. ii. 109. 



Pennsylvania, two specimens ; Dr. Le Conte. Resembles crassicornis, 

 from which it differs by its more convex form, its smooth elytral interspaces, 

 and the plications of the gular region, which are in three transverse series. 

 The antennae are of normal form, the eighth joint being much smaller than the 

 ninth. 



7. T. corticalis, nigra, subnitida, modice convexa, capite thoraceque 

 grosse punctatis, hoc lateribus modice rotundatis, antice latiore, postice vix 

 angustato, margine reflexo, angulis posticis acutis, basi rotundato, elytris ob- 

 longis, basi vix emarginatis, humeris rectis, striis punctatis, interstitiis modice 

 convexis, subtiliter rugulosis, biseriatim subtiliter punctulatis. abdomine pros- 

 ternoque grosse punctatis, gula baud plicata, pedibus nigris, antennis nigro- 

 ferrugineis. Long. -33' 



T. corticalis, Mels. Proc. Acad. ii. p. 109. 



Common in Pennsylvania. This is, probably, the best known of all our spe- 

 cies. It may be found under the bark of stumps, at almost any season. The 

 thorax is broader than long, coarsely punctured, and in Melsheimers typical 

 specimen with the sides near the margin with shallow impressions, The elytra 

 are twice as long as broad, and slightly dilated behind the middle. 



8. T. intermedia, nigro-picea, subnitida, convexa, capite thoraceque 

 parce grosse punctatis, hoc lateribus rotundatis, antice latiore postice angus- 

 tato, margine reflexo, angulis posticis acutis vix reflexis, elytris oblongis, basi 

 late emarginatis, versus humeros impressis his rectis, striis punctatis, intersti- 

 tiis planis parce rugulosis, biseriatim subtiliter punctulatis, abdomine confertim 

 punctulatis, prosterno parce punctato, gula subplicata. Long. *32. 



Kansas two, San Jose one specimen. The species resembles the corticalis 

 differing in the more elongate thorax which is more narrowed posteriorly, the 

 posterior angles are better developed and slightly reflexed, its body is less de- 

 pressed, and the sides of the elytra more nearly parallel. 



[Feb. 



