1854.] 215 



B. Corpus alalum ; thorax tuherculis punctatis hated nitidis ornatis. 



i 



5. O. scabrosus, sordide niger, opacus, thorace valde inaequali, lateribus 

 rotundatis pone medium incisis, angulis posticis rotundatis, elytris tuberculis 

 magis elevatis cataphractis seriatis ornato, seriebus alternis maioribus, inter- 

 stitiis punctis muricatis sparsis fere inordinatis. Long. -57 7. 



Trox scabrosus Beauv., Ins. d'Afr. et d'Amer. 175, tab. 46, fig. 4.* 

 New York, Florida, Texas. This species has entirely the appearance of the 

 next, from which it seems to differ only by its usually much larger size, and by 

 the sides of the thorax (excluding the indentation) being rounded instead of an- 

 gulated, and by the elevated points between the large series of tubercles of the 

 elytra being much larger, and by some of them forming intermediate series of 

 smaller tubercles. As in the next there is a sutural series of small tubercles. 

 This large species is abundant, especially near the sea shore. 



6. O. pustulatus, sordide fuscus, vel niger, opacus, thorace valde inaequali, 

 lateribus medio fere angulatis, pone medium incisis, angulis posticis rotundatis, 

 elytris tuberculis serie quadruplici et ad suturam positis magis elevatis cata- 

 phractis, interstitiis parce inordinatim muricato-punctatis. Long. 55 *6. 



? 'Trox tuber culatus\\ Beauv., Ins. 175, tab. 46, fig. 3. 



Southern States, not rare. This species agrees very well with Beauvois' figure, 

 but his insect is said in the text to have been found in Hayti. It is remarkable 

 that while he mentions that Trox tuberculatus (Olivier) was unknown to him, 

 he should retain for his own very different species the same specific name. 



This species is distinguished (apart from the differences in the elytra) from the 

 following as well as the preceding species by the sides of the thorax converging 

 obliquely from the middle to the apex ; the effect of this is to produce an indis- 

 tinct angle near the middle ; this character in consequence of the gradual curving 

 of the sides is not seen either in 0. scabrosus or in O. asper. 



7. O. a s p e r , niger, sordidus, opacus, thorace valde inaequali, lateribus late 

 rotundatis, pone medium subincisis, angulis posticis latius rotundatis, elytris 

 tuberculis magis elevatis cataphractis quadruplici serie ornatis, sutura intersti- 

 tiisque tuberculis minutis uniseriatim positis, et ordinatim profunde punctatis. 

 Long. 5. 



Georgia, South Carolina, Mr. Zimmermann. The elevated punctures scattered 

 irregularly between the rows of tubercles, as seen in the two preceding species, 

 have here disappeared ; the intervals are somewhat unequal, and in each are seen 

 two moderately regular rows of large punctures, with an intervening series of 

 small tubercles, which like the larger tubercles are covered with a brown crust. 

 These small tubercles are, however, scarcely more elevated than the places be- 

 tween the punctures forming the rows. The lateral incision of the thorax is 

 much less deep than in the preceding species, and the posterior angles are broader 

 and less prominent. 



8. O. punctatus, griseus, thorace inaequali, lateribus obliquis late rotun- 

 datis, pone medium subincisis, angulis posticis vix rotundatis, canalidorsali antice 

 mediocri, elytris seriatim crenato-punctatis, interstitiis parce subtiliter muricato- 

 punctatis, alternis paulo elevatis nigro-tesselatis. Long. *46 '55. 



Trox punctatus Germ. Ins. Nov. 113. 



Trox alternatus Say, Bost. Journ. Nat. Hist. 1, 179. 



Trox crenatusl Beauv., Ins. 176, tab. 46, fig. 1 : (nee Oliv., Ent. 4, tab. 1, f. 4.) 



Trox denticulatus\ Beauv., Ins. 175, tab. 46, fig. 7, 8 : (nee Oliv. Ent. 4, tab. 

 2, fig. U.) 



ITrox unistriatus Beauv., Ins. 175, tab. 46, fig. 5. 



Our most abundant species, found from New York to Santa Fe and Texas. 

 The tesselated spots of the elytra in well preserved specimens afford an excellent 

 character for distinguishing it : greasy specimens are uniformly black in color, 

 and in such the absence of tubercles on the elytra, and the less deep dorsal channel 

 of the thorax may be taken as distinguishing marks. The punctures of the stria? 

 of the elytra vary somewhat in size; sometimes they are small, deep and well 



