144 GEO. H. HORN, M. D. 



li. mncorens Lee. Synopsis Melolonthidse, Journ. Acad. Ser. 2, vol. ii, 

 p. 263 ; texanus Lee. ibid. — Oblong, subcylindrical, piceo-rufous or rufous, sur- 

 face distinctly pruinose, sparsely clothed with short erect hair. Head coarsely 

 but not densely punctured, front flat, clypeus transverse, broadly rounded at 

 the sides, margin rather widely reflexed especially at middle. Thorax one- 

 half wider than long, slightly narrower in front than at base, sides rather 

 broadly arcuate, margin fimbriate and feebly serrate in front, disc moderately 

 convex rather coarsely but not densely punctured. Elytra moderately coarsely 

 but sparsely punctate, costse entirely obliterated, margin sparsely fimbriate. 

 Body beneath moderately densely pilose, abdomen shining, very sparsely punc- 

 tate. Length .50 — .70 inch; 12.5 — 17.5 mm. 



Male. — Club of antennae slightly longer than the funicle. Abdomen feebly 

 flattened at middle, last segment very short. Pygidium very convex at tip, 

 surface sparsely punctate. Anterior claws dissimilar, the outer pectinate along 

 a double margin and with an obtuse tooth near the tip, inner claw pectinate 

 without tooth. Middle claws similar, each pectinate along a double margin. 

 Posterior claws similar to the middle. Posterior tibiae scarcely fimbriate 

 ■within, spurs rather slender, outer broader and longer and with a pellucid 

 border at tip. Posterior tarsi slender, longer than the tibia. 



Female. — Club of antennae shorter than the funicle. Abdomen convex, fifth 

 ventral slightly gibbous near the tip, last ventral short. Pygidium rather flat, 

 longer than the male, sparsely punctured, opaque at base, apex slightly longi- 

 tudinally impressed. Anterior claws similar each with a strong acute tooth 

 near the tip, serrulate at base along a single margin only. Middle claws like 

 the anterior. Posterior claws dissimilar, the inner pectinate along a single 

 margin, the outer toothed as in the anterior claws. Posterior tibial spurs 

 nearly equal in length the outer broader, each spatulate at tip with a pellucid 

 margin, tarsi longer than the tibiae. 



One specimen, Cape San Lucas, Lower California. 

 I am entirely unable to discover any differences of a specific cha- 

 racter between mucoreus and texanus, the types of the latter are 

 merely somewhat smaller and more decidedly ferruginous in color. 



Occurs in Texas, New Mexico, Arizona, and the desert region near 

 Fort Yuma, California. • 



Ii. obtilSUS Lee. Synopsis Melolonthidae, Journ. Acad. Ser. 2, vol. ii, 

 p. 2fi4. — Oblong ovate, ferruginous, faintly pruinose, surface sparsely pubescent, 

 hairs longer near the base of the elytra, gradually becoming shorter toward 

 the tip where they are very short. Head coarsely and densely punctured, 

 front flat, clypeus transverse, anteriorly broadly arcuate, margin moderately 

 reflexed. Thorax one-third broader than long, apex narrower than base, sides 

 broadly and regularly arcuate, margin not serrulate and fimbriate with moder- 

 ately long hair, disc moderately convex, coarsely but not densely punctured. 

 Elytra not densely punctate, sutural costa very feeble. Body beneath moder- 

 ately densely fimbriate, abdomen very sparsely punctate. Length .54 inch; 

 13.5 mm. 



Male. — Club of antennae longer than the funicle. Abdomen convex, sparsely 

 punctulate, fifth segment very slightly longitudinally wrinkled on each side, 

 sixth segment short. Pygidium convex, sparsely punctate and subtruncate 

 at tip. Claws of anterior tarsi dissimilar, the inner pectinate along a double 



