1873.] J<3 [Horn. 



joints 3-11 sub-equal. Anterior tibiae with a single terminal spur. Fe- 

 mora pubescent beneath. 



Female. Not known with certainty. 



One male from Georgia. 



M, immacixlata, Say. Jour. Acad. Ill, p. 301 ; articularis, Say, ibid ; 

 fulvescens, Lee. Proc. Acad. 1853, p. 447. 



Black, densely clothed with pubescence varying in color from ferru- 

 ginous to cinereous. Form and sculpture very closely resembling albida. 

 Disc of thorax and elytral humeri concolorous. Body beneath clothed 

 as on the upper surface. Legs as in albida. Length .50-.90 inch; 

 13-23 mm. 



Male. First joint less than half the length of head, feebly flattened 

 and not contorted at tip, second joint cylindrical, slightly longer than 

 half the first, and somewhat shorter than third, joints 3-11 sub-equal 

 and gradually more slender to tip. Anterior tibiae bicalcarate. Femora 

 entirely pubescent beneath. Sixth abdominal segment feebly emarginate 

 at tip. 



Female. Antennae scarcely differing from the male, but with the basal 

 joints more slender. Sixth abdominal segment sub-truncate. 



The thorax of this species is rather shorter than albida or longicollis 

 which it most resembles, but for their separation the sexual characters 

 as given in the table must be relied on. 



Not rare in Kansas, Colorado and Texas. 



M. segmentata, Say. Journ. Acad. Ill, p. 303 ; Lee. Proc. Acad. 1853. 

 p. 342 ; valida, Lee. Journ. Acad. IV, 1858, p. 39. 



Body above entirely black, clothed with short black pubescence. Head 

 feebly shining densely punctulate. Thorax nearly as broad as long, sides 

 in front arcuate to apex, disc moderately convex, median line feebly im- 

 pressed in front, more deeply and broadly impressed at base, surface 

 densely punctulate, sparsely pubescent with black, and with the apical 

 and basal margins fimbriate with short cinereous hairs. Elytra scarcely 

 broader at base than thorax and gradually broader behind, surface sub- 

 opaque, finely scabro-punctate and sparsely clothed with short black 

 hairs. Body beneath black, more shining thau above, punctulate and 

 pubescent with short black hairs, the coxae and apices of the abdominal 

 segments margined with short white pubescence. Legs entirely black, 

 densely punctulate and sparsely pubescent. Length .52-. 92 inch; 13- 

 23 mm. 



Male. First joint of antennae shorter than half the head, slightly 

 thicker externally and feebly flattened, second half the length of first 

 and slightly shorter than the third, fourth shorter than third and equal 

 to second, joints 4—11 sub-equal and gradually more slender to tip. Sixth 

 abdominal segment feebly emarginate. 



Female. Antennae not differing in form from the male and somewhat 

 more slender. Sixth abdominal segment somewhat sub-truncate. 



This species is usually very feebly winged, the wings being very small 

 and rudimeutary, specimens however occasionally occur with the wings 



