AMERICAN COLEOPTERA. 49 



rnghieus. The vertex is flat in the male but with a transverse eleva- 

 ted ridge or short transversely flattened horn in the female. The tho- 

 rax is less abruptly elevated in front than in the other species and the 

 processes less strongly developed. When viewed anteriorly the thorax 

 presents a faint median groove, on each side a deeper fossa bounded 

 by an obtuse elevation. On each side of the thorax is an acutely ele- 

 vated line proceeding upwards from a short distance behind each an- 

 terior angle, parallel with the base of the thorax. Of this lateral 

 ridge no trace is found in either ferrur/ineus or /ossatus. Length .46 

 — .74 inch; 12 — 18.5 mm. 



From Texas to Fort Yuma, California. 



The following table will also serve to distinguish the species : — 



Margin of thorax entire ferrugineus. 



Margin of thorax serrate ; 



Sides of thorax sinuate near anterior angle fossatus. 



Sides of thorax gradually rounded, not sinuate serratus. 



BOLBOCERAS, Kirby. 

 Our species are two in number and arc readily distinguished. 



B. lazarus, Fab., (ScarabcEus) Syst. 1, 11; Oliv. Ent. I, 3, p. fiS, pi. IC, fig. 146. 

 melebmus. Fab. Syst. I. 20 ; VVestw. Trans. Linn. Soc. 1852, p. 2S, pi. 4, fig. 26. 



The body is uniform castaneous in color, smooth and shining. The 

 elytra have never more than five punctured stria) between the suture 

 and humeral prominence. The well developed males have a flattened 

 horn arising from the clypeus, slightly recurved and truncate or emar- 

 ginate at tip. There is also an elevated transverse line on the vertex. 

 The club of the antenna) is elongate oval in both sexes, with the first 

 joint smooth and shining. In the females the clypeal horn becomes 

 a ridge, while the vertical ridge seen in the male is more prominent. 

 Length .20 — .50 inch; 5 — 13 mm. 



This species is distributed over the entire region east of the Rocky 

 Mountains. 



B. farctttS, Fab. {Scarahocus) Species 1, 14; Panzer, Faun. B. A. p. .3: King 

 Monog. p. 51, (Abhand. Berl. Ac. 1S43) ; Cephiis Fab. Id. p. 19; Oliv. Ent. 1—3, 

 p. 6S, pi. 11, fig. 96; tumefactus Beauv. {Smrab.) Ins. p. 91, j)l. 2, fig. 6. 



This species is much more robust than the preceding. The Cdlor is 

 yellow with the tibia) occasionally darker. The head is black, also a 

 narrow space along the base and sometimes a discal spot of the thorax. 

 The elytra have the first interspaces black, also a subapical space be- 

 coming at times so large as to to involve more than half the elytra. 

 The males have the anterior edge of the clypeus and the angles of the 

 gena) acutely but slightly elevated. The horn is always short, acute 

 at apex, and arising from the vertex. The females have merely a 



TRANS. AMER. ENT. SOC. (7) MARCH, 1870. 



