NORTH AMERICAN COLEOPTERA. 123 



Aiitenn?e entirely piceous, short and stout, the joints three to ten not twice as 

 Ions as wide. Elytra dull yellow, varying through brownish to black. 



forevicorne. 

 These two species are from the southwestern regions of our country. 



M. viftipeiiiie n. sp. — Oblong, parallel, slightly depi'essed, pale yellow, 

 elytra with narrow black vittfe, raetasternum and abdomen piceous, surface 

 glabrous, shining. Antenna; slender, more than half the length of the body, 

 black; three basal joints yellow. Head smooth, yellow, occiput with a large 

 piceous spot each side. Thorax one-third wider than long, sides arcuate in front, 

 widest one-third from apex, anterior angles slightly nodiform, disc moderately 

 convex, smooth, shining; scutelluni black. Elytra very little wider than the 

 thorax, shining, minutely sparsely punctate, color paler yellow than the thorax, 

 with the side margin not reaching apex, suture and three narrow vittfe black, 

 the middle vitta begins within the humeral umbone at base and extends nearly 

 to apex, the other two vitts^are incomplete in Front, but meet around the end 

 of the middle vitta near the apex. Legs always entirely pale. Abdomen sparsely 

 hairy. Length .26 inch. ; 6.5 mm. 



Male. — Last ventral segment truncate at middle, each side of which is a mod- 

 erately deep notch, the disc of the segment concave. 



Female. — Last venti'al segment with a broadly curved margin. 



At first glance this insect very much resembles some of our Dis- 

 oriychce from the style of ornamentation. 



The front has a distinct transverse groove between the eyes in this 

 species, but much less marked than in brevicorne, and in neither has 

 there been observed any tendency to a carination of the tibiae near 

 the knee. In both these characters the two species seem at variance 

 with those given by Chapuis. 



Occurs in southwestern Texas, precise region unknown, 



HI. brt'vicorne Jacoby, Biol. Cent.-Amer. vi, pt. 1, p. 582 (December, 1887). 

 — Oblong, parallel, less depressed, color fulvous, the elytra varying to brown or 

 black. Antennie entirely piceous, extending but little beyond the hind angles 

 of the thorax. Head smooth, a deep transverse frontal impression, color variable 

 sometimes entirely black, I'arely entirely yellow, usually with the front vellow 

 and occiput black. Thorax one-fourth wider than long, sometimes slightly 

 narrower at apex than at base, disc convex, smooth ; scutelluni piceous. Elytra 

 moderately closely punctate with coriaceous wrinkles, color fulvous, varying to 

 black; epipleurae of the color of the elytra. Body beneath variable in color, 

 rarely entirely black or yellow, usually with the metasteruum alone piceous. 

 Legs somewhat variable in color, sometimes entirely black, usually with the 

 knees, tibise and tarsi black. Length .20— .24 inch. ; 5—6 mm. 



Male. — Last ventral segment with a median truncate lobe limited each side by 

 a notch, the disc of the segment with an oval, abrupt depression. 



Female. — Last ventral oval at tip. 



The variations of this insect have been in great part indicated in 

 the description. From the material before me it would seem that 



TEANS. AM. ENT. SOC. XX. JUNE, 1893. 



