374 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



ion of tlie surface impunctate, excepting along the middle, in the lunate 

 impression, and on each side ; surface behind the transverse impression 

 coarsely, not densely, punctate, the posterior submargin and humeri 

 impunctate, the posterior margin deflexed, a little arcuated, and feebly 

 sinuated before the humeral angles. Anterior tibiise armed on the front 

 margin with long and very stout spines ', tarsi pale yellow. Scutellum 

 polished, remotely punctate, the base almost destitute of punctures ; tip 

 a little depressed, bluntly and angularly rounded. Hemelytra remotely, 

 finely punctured, those of the apical portion becoming finer and almost 

 obsolete ; the costal margin broadly arcuated, ciliated at base with long 

 bristles ; membrane and wings milk-white. Venter smooth in the mid- 

 dle, sides minutely scabrous j anal segment punctate; the lateral mar- 

 gins fringed with long hairs. 



Length 4J millimeters. Width of base of pronotum 21 millimeters. 



Obtained at Ogden, Utah ; also collected in Central Texas by G. W. 

 Belfrage, and by myself west of Denver, Colo. 



2. M. testudinatus. 



M'lcroporus testudinatus Ubler, Ball. U. S. Geol. Surv., 2d ser., vol. ii, No. 5, p. 10. 



Ovate, broadly rounded, more convex than the preceding species. 

 Head slanting in conformity with the curve of the pronotum ; the ante- 

 rior margin broadly recurved and rounded, feebly emarginate in front, 

 the submargin with long setae and stout, close teeth, of which two are 

 on the tip of thetylus; surface smooth, polished, impunctate; an im- 

 pressed point each side near the eye, and each side of the tylus is an 

 oblique impressed line ; tylus shorter than the lateral lobes, the latter 

 bluntly rounded and obsoletely wrinkled. Antenuse pale ferruginous, 

 the second joint slender, mach the shortest, cylindrical ; the third, fourth, 

 and fifth subequal in length. Rjstrum reaching upon the intermediate 

 coxae, pale ferruginous, the third and fourth joints subequal, together 

 longer than the second, Pronotum transverse, in front much narrower 

 than behind ; the anterior margin deeply emarginated to receive the 

 head, the angles moderately protracted forward, bluntly rounded ; the 

 lateral margins steep, the edge very thin, convexly arcuated, closely 

 fringed with long ferruginous hairs; posterior margin feebly rounded, 

 the exterior angles rectangnlar, a little rounded; surface smooth, 

 polished, obsoletely punctate each side and behind the middle, the an- 

 terior division smoother, and with a very few minute punctures; behind 

 each eye is a sunken point, and across the middle a series of six similar 

 points. Pectus pale piceous, the disks of pleural pieces darker. Legs 

 pale ferruginous, more or less tinged with piceous; the spines blackish 

 piceous; femora compressed, having two rows of punctures carrying 

 ciliie ; spines of the outer margin of anterior tibiae longer, the submargin 

 with a slender groove bearing coarse punctures ; the posterior tibiae 

 long, feebly curved, hardly thicker toward the end ; the tarsi slender, 

 yellow; the intermediate joint smill. Scutellum very broad, polished. 



