Mar., igog.] 



Fall: Synopsis of Ochod^us. 37 



margin which is but slightly emarginate. Frontal lobe broadly arcuate, a strong 

 tubercle at the middle of the margin, which is not distinctly reflexed. Vertex with 

 short transverse carina. Prothorax three fifths as long as wide, sides strongly rounded, 

 surface moderately densely granulate-punctate, median line rather deeply impressed 

 in basal half. Elytra about twice as long as and not appreciably wider than the 

 prothorax ; strise well impressed, strial punctures moderate ; sutural angle not denti- 

 form. Upper tooth of front tibia small and remote from the middle tooth. Hind 

 thighs with an acute unciform apical tooth, and another equally acute at the apical 

 third. Hind tibiae broadly flattened and compressed, subparallel, nearly one half as 

 wide as long. Basal joint of hind tarsus slender and as long as the three following. 

 Length 7.5 mm. ; width 4 mm. 



Described from two males taken by Prof. F. H. Snow in Cochise 

 Co., Arizona, one labeled "Douglass," the other "San Bernardino 

 Ranch, 3,750 ft." 



This species is allied to prcesidii in the expanded hind tibiae, and 

 \o frontalis in the form of the mentum and armature of the posterior 

 femora, from both of which it is easily distinguished by the tabular 

 characters. 

 15. 0. nimius Fall., Trans. Am. Ent. Soc, 1907, p. 248. 



One of our smaller species, similar in size, form and color to 

 biarmatus, though not closely related to that species structurally. In 

 its strictly marginal clypeal tubercle it differs from all our species 

 except gnatho and repandiis, the former differing conspicuously by its 

 remarkable mentum and broad head, the latter by its broad flattened 

 hind tibiae. By its flat and strongly transverse mentum inmiiis is allied 

 to striatus and sparsus, and by its rather strongly produced mandibles 

 with distinct external angulation and sinuation it resembles sparsus 

 and mandibularis. The elytral striae are coarsely punctate, the in- 

 tervals rather narrow with no more than two punctures in their width. 

 The unique type was taken at light at Mesilla, New Mexico, by Pro- 

 fessor Cockerell. 



16. 0. frontalis Lee, Smith. Miscel. Coll., 1863, p. 76. 

 Complex Lee, Trans. Am. Ent. Soc, 1868, p. 51. 



Species of medium size. Mentum as long as wide, nearly flat, a 

 feeble impression in front only. Frontal lobe only moderately ad- 

 vanced, broadly truncate, the tubercle near the frontal suture ; vertex 

 transversely carinate. In the male of this species the femoral armature 

 reaches its maximum development, the front and middle as well as the 

 hind thighs having an unciform tooth at apex, the hind thighs an ad- 

 ditional acute tooth at apical third, and the front thighs a small tooth 



