22 [Febrtjary, 



apicem alte et paulo concave transversim reflexa, thorace lateribus rotundatis, 

 punctato, parciu3 in disco pone medium, elytris sat grosse punctato-striatis, 

 P)gidio piinctulato, parcius ad apicem. Long. '67. 



Bolhynus pyriform.rs Lee. Journ. Acad. Nat. Sc. 2d ser, 1, 88. 



Found near the forks of the Platte River. I observed in the collection of Capt. 

 Wilkes' Exploring Expedition a specimen from Oregon, that I referred to this 

 species, but as I have not now an opportunity of re-examining it, I cannot 

 answer for the correctness of the reference. The sides of the head are extremely 

 narrowly margined. 



B. Pygidium very convex, last abdominal segment with a very strong line near 



the margin. 



2. A. tridentatus, ovatus, piceus, subtus obscure ferrugineus, capite dense 

 rugoso tenuiter marginato, fronte ad apicem emarginata et medio submucronata, 

 mox pone apicem alte transversim reflexo tridentato, thorace lateribus rotunda- 

 tis, punctato, parcius in disco pone medium, elytris grosse punctato-striatis, 

 pygidio subtilissime punctulato, abdominis segmento ventrali ultimo linea mar- 

 ginali insculpto. Long. 64. 



Scarabceus tridentatus Say, Journ. Acad. Nat. Sc. 3, 209. 



Uothynus tridentatus Lee. Journ. Acad. Nat. Sc. 2d ser. 1, 88, 



One specimen found by me near Long's Peak ; another from Missouri was 



given me by Prof. Agassiz. Both are females, and have the marginal line of 



iht; last abdominal segment sinuate at the middle. 



3. A. f r a t e r, nigro-piceus, subtus nigro-ferrugineus, capite rugoso tenuiter 

 marginato, in vertice obsolete elevato, clj'peo ad apicem emarginato et mucronato, 

 mox pone apicem linea transversa elevata tridentata, thorace lateribus rotunda- 

 tis, punctato, parcius in disco pone medium, elytris rarius punctato-striatis, 

 pygidio punctulato, versus apicem parce punctato, abdominis segmento ultimo 

 ventrali linea marginali insculpto. Long. -65. 



One male found in New Jersey, given me by Mr. Guex. Differs from A. triden- 

 tatus only by the pygidium being nearly smooth at the tip, with a few distinct 

 punctures, and by the punctures of the elytra being smaller and the striae less 

 numerous ; this is produced by the absence of the rows between the alternate 

 stria^ ; these intermediate rows are usually known by being slightly irregular. 

 From the next species it differs by this character, as well as by the color and 

 shape. 



4. A. h y d r o p i c u s, breviter ovatus, ferrugineus, capite rugoso fortius mar- 

 ginato in vertice obsolete elerato, clypeo ad apicem emarginato et mucronato, 

 mox pone apicem linea transversa elevata tridentata, thorace lateribus rotunda- 

 lis, punctato, parcius in disco pone medium, elytris fortiter punctato-striatis, 

 pygidio parce subtiliter punctato, ad basin dense punctulato, abdominis seg- 

 mento uliimu ventrali linea marginali insculpto. Long. -ST. 



Bothynvs vnriolosus\\ Lee. Journ. Acad. Nat. Sc. 2d. ser. 1, 88. 



Georgia, not rare. Much more dilated behind than the two preceding, with 

 the punctures of the elytra large and the rows numerous. The pygidium of the 

 female is much more convex than that of the male, and the submarginal line of 

 the last ventral segment is sinuous in the middle, while in the male it is uni- 

 formly curved. 



5. A. castaneus, breviter ovatus, ferrugineus, capite rugoso fortius mar- 

 ginato, vertice vix elevato, clypeo ad apicem emarginato et acute mucronato, 

 mox pone apicem linea transversa elevata tridentata (dente medio minore,) 

 thorace parcius punctato, elytris fortiter punctato-striatis, pygidio parce subti- 

 liter punctato, ad basin punctulato, abdominis segmento ultimo ventrali linea 

 submarginali inculpto. Long. -45. 



Bolhynus castaneus Mels. Proc. Acad. Nat. Sc. 2, 138. 

 Podalgus obesus Burm. Lamell. 3, 119. 



