184 GEO. H. HORN, M. D. 



8. — Intercoxal process of mesosternum rather deeply grooved in its entire length. 



Elytra variegated with a net- work of very fine pubescence in at least one sex. 



Elytra distinctly wider at base than the thorax, the humeri slightly 



prominent. Thorax with very few punctures and these placed along the 



base and apex. Pubescence of elytra white I'lkei n. sp. 



Elvtra not wider at base than the thorax, the humeri rounded. Tho- 

 rax with numerous punctures on the disc. Pubescence of elytra fulvous. 



variolaro Thorns. 

 Intercoxal process of mesosternum nearly flat not grooved. Elytra not pu- 

 bescent crassum Lee. 



M. annulatum Say. — Black, moderately shining. Front smooth. Scape 

 of antennae smooth, joints 3-fi annulate with white at basal half. Thorax quad- 

 rate, slightly narrower in front, wider than long, sides usually slightly arcuate 

 with a feeble tubercle slightly behind the middle, surface nearly smooth, a few 

 punctures along the basal margin only. Elytra elongate oval, about twice as long 

 as wide, narrower at apex than base, sides arcuately declivous, surface moderately 

 coarsely and regularly punctured at basal half, the apex slightly wrinkled, in well 

 preserved specimens a stripe of extremely fine plumbeous pubescence extending 

 from the humeri to the apex. Body beneath smooth and shining, femora smooth. 

 Length .48 -.72 inch; 12-18 mm. 



The anterior and middle tarsi have the first three joints spongy pubes- 

 cent beneath divided by a narrow line. The first joint of the hind tarsus 

 is without spongy pubescence, the second and third joints spongy pubes- 

 cent with a wider median division. 



This species exhibits very little noteworthy variation. A small speci- 

 men in Mr. Ulke's cabinet has very few punctures at the base of the elytra. 



Occurs in Colorado, eastern New Mexico and Northern Texas. 



M. appressiim Lee. — Black, feebly shining. Front with few small punc- 

 tures. Scape of antennae nearly smooth, joints 3-G annulate at base. Thorax 

 subcylindrical, longer than wide, slightly narrower in front, sides not tuberculate, 

 surface nearly smooth, a few inconspicuous punctures along the base. Elytra 

 elongate oval, a little more than twice as long as wide, apex scarcely narrower, 

 sides abruptly declivous, obtusely margined near the base, surface with few in- 

 conspicuous punctures at basal third, the surface either smooth, vaguely, or even 

 deeply longitudinally wrinkled. Body beneath smooth, legs smooth. Length 

 .56-1.16 inch; 14-29 mm. 



The tarsi beneath are similar to those of annulatum but the median 

 division is sometimes indistinct. The second joint of the hind tarsi has 

 a smaller pubescent space. 



This species varies especially in the elytra. In some the disc is rather 

 flat and the edge of the declivity distinctly marked, in others nearly as 

 convex as in annulatum. The surface may be quite smooth with feeble 

 trace of wrinkles or may be deeply longitudinally wrinkled, with all inter- 

 mediate forms. 



