292 GEO. H. HORN, M. D. 



Var. . A specimen from Colorado has the elytra entirely 



black, without vitta, the head is also fuscous. 



Occurs everywhere in our territory except in the Arizona region. 



M. «liiiii<lisitii n. sp. — Black, above yellow, median space of thorax, sutural 

 stripe and apical half of the elytra black. Antennae black, third joint scarcely 

 longer than the fourth. Vertex sulcate, bronzed. Thorax gradually broader to 

 base. Sides at middle subangulate, disc convex cribrately punctured. Elytra 

 nearly parallel, very slightly broader behind, apices conjointly rounded, the mar- 

 gin serrate, disc with eight rows of coarse deep punctures separated by three well- 

 marked costae. Legs black. Length .20 inch ; 5 millim. 



This species differs entirely in the style of coloration from any in our 

 fauna and approaches the Mexican type of Hispidae. I have in my 

 cabinet a Mexican species closely resembling the present, which differs in 

 the elytra at tip, more strongly dentate and the thorax has on each side 

 an elongate smooth callus. 



Occurs in Texas. 



M. Xerene Newrn. — Black, sides of,thorax and elytral vitta reddish yellow. 

 Front usually coarsely punctured, rarely with traces of grooves. Elytra with 

 eight regular rows of deeply impressed punctures, the intervals between them 

 slightly alternating. Length .16-.20 inch; 4-5 millim. 



Var. interrupta Couper. — In this form the vitta is interrupted. The 

 species otherwise is very little variable. 



Occurs in the Atlantic region and Canada. I have not seen speci- 

 mens from west of the Mississippi. 



M. riihro! i ii<-;itu Mann. — Body above and beneath blue, sides of thorax 

 and elytral vitta reddish-yellow. Head distinctly grooved. Length .16-.20 inch ; 

 4-5 millim. 



Var. signaticollis Lee. — This form has the elytral vitta entirely wanting. Numer- 

 ous specimens have been observed in which the vitta extends but half the length 

 of the elytra. 



This species is closely related to the preceding and differs by very 

 slieht characters which are, however, constant. It will also be observed 

 that the margin of the elytra near the apex is very distinctly serrate in 

 this species. 



Occurs in California. 



IH. viiliioratH n. sp. — Form of the preceding species, above and beneath 

 blue, elytra with a yellowish-red vitta, which is broader toward the base. Front 

 sulcate. Thorax entirely blue, punctures coarse and deep, but distinct, not con- 

 fluent. Elytra with margin serrulate near the apex, disc with eight equal rows 

 of coarse deep punctures, the intervals equal; vitta extending about two-thirds 

 the length of the elytra, and at its basal half suddenly wider and reaching nearly 

 to the side margin. Length .14-. IS inch ; 3.5-4.5 millim. 



Although closely related to rubroliiieata the present species has the 



