NATURAL SCIENCES OP PHILADELPHIA. 85 



9. T. d u b i a, Mels, nigro-picea, convex*, capite thoracqtie grosse punc- 

 tatis, hoc antice latiore, postice parum angustato, lateribus vix rotundatis, an- 

 gulis posticis acatis, margine reflexo, basi rotundato, elytris oblongis, humeris 

 rectis, basi rectis, versus humeros impressis, striis punctatis, iaterstitiis planis, 

 parce rugulosis, biseriatiru subtiliter punctulatis, abdomine prosternoque sub- 

 tiliter punctulatis, gula triseriatim trausverse-plicata, antennis pedibusque nigro- 

 ferrugineis. Long. -25. 



T. dubia, Mels. Proc. Acad. ii. 110. 



Pennsylvania, common. Resembles both the c orticalis and interme- 

 dia, but is smaller than either. Its thorax is more quadrate, the sides neither so 

 much rounded as in the former, nor so convergent as in the latter species. The 

 gular region is rendered less smooth than in the other two by the presence of 

 three transverse ridges or folds. 



10. T. s e m i c y 1 i n d r i c a, rufa, valde convexa, subtus parce grosse punc- 

 tata, capite thoraceque parce punctatis, hoc quadrato, versus latera vix punctata, 

 postice haud angustato, lateribus vix rotundatis, angulis posticis rectis, margine 

 reflexo, basi rotundato, elytris oblongis hunieris rectis, basi late emargiaacis, 

 striis grosse punctatis, interstitiis planis, vix rugulosis, biseriatiui subtiliter 

 punctulatis, gula transverse-plicata, femoribus auteuuisque pallidioribus. 

 Long. -23. 



Two specimens, Georgia ; Dr. Le Conte. This can hardly be confounded 

 with any other American Trogosita. Its form is rather elongate, very convex and 

 with parallel sides ; the thorax is nearly quadrate, slightly narrower posteriorly, 

 the posterior angles right, and with coarse punctures not closely arranged. 

 The interstrial spaces are flat, scarcely roughened and having the two rows of 

 smaller punctures very poorly marked, in some interspaces but one row appear- 

 ing. Its color is light rufous, with a slight Drassy refulgence . It may be im- 

 mature. 



B 2b. 



11. T. n a na, rufo-picea, depressa, capite thoraceque parce grosse punc- 

 titis, hoc antice latiore, postice parum angustato, lateribus modice lotun- 

 d itis, margine reflexo, angulis posticis acutis parvis, basi rotundato elytris ob- 

 longis, striis punctatis, interstitiis modice convexis, parce rugulosis, biseriatim 

 subtiliter punctulatis, prosterno vix puuctulato, gula antice abdomineque parce 

 grosse punctato, gula postice transverse plicata. Long. "24. 



T. nana, Mels. Proc. Acad. ii. p. 110. 



? T. mutica, Palisot de Beauv. Ins. p. 126, pi. 32, fig. 6. 



Pennsylvania, common. This species can hardly be confounded with any 

 other. The thorax is slightly broader than long, its sides moderately rounded, 

 and somewhat convergent posteriorly. The eljtra are about twice as long as 

 wide, with the sides moderately rounded, and broader behind the middle. Its 

 color approaches castaneous. The color of the species of the genus Trogosita 

 is generally black or dark brown, hence from the color of this and the prece- 

 ding species, their immaturity might be inferred, but in this instance the color 

 appears constant, being the same in each individual of a full series, collected 

 during several seasons. 



12. T. co liar is, valde depressa, subtus vix punctulata, capite thorace- 

 que parce subtiliter punctulatis, rubris, hoc antice latiore, postice vix angus- 

 tato lateribus rotundatis, margine reflexo, angulis posticis acutis, basi rotun- 

 dato, elytris oblongis, nigris, humeris rectis, basi emarginatis, striis vix punctu- 

 latis, interstitiis planis, laevis, vix biser.atim punctulatis. hong. *23 -28. 



T. collaris, Sturm., Ins. Deutsch ii. p. 246.pl. 48. 



T. nigripcnnis, Dej. Catal. 



Georgia, two specimens; Dr. Le Conte. The color alone would serve to dis- 

 tinguish this from any other species. The head and thorax are of an orange 

 red, and the elytra black. In shape this resembles the preceding species. Its 



1862.] 



