38 AVILLIAM G. DIETZ, M. D. 



M. tenebrosus n. sp.— Oblong elliptic; rather stout, dark piceous. An- 

 tennjE. except clava and tarsi, paler; beak moderately stout, broader at base 

 subconvex with fine, feeble, elevated lines ; densely scaly, intermixed with stout, 

 short, erect hairs. Head transverse, subconvex, with an obscure frontal fovea. 

 Thorax subquadrate, transverse, more than one-half wider than long ; base 

 slightly rounded, with the hind angles almost rectangular; sides straight for 

 three quarters their length then rather suddenly rounded to and distinctly con- 

 stricted at tip; subconvex, finely granulate and densely covered with small, 

 round scales, intermixed like those of head and beak, with short, stout hairs: 

 vittfe obsolete. Elytra one half wider than thorax, .scarcely emarginate at base, 

 parallel for two-thirds, then gradually narrowed to tip, which is slightly com- 

 pres.sed. Strife well impressed, punctures rather large, subquadrate and approxi- 

 mate; interspaces convex, third and fifth a little more elevated near the base : 

 finely punctulate and transversely rugulose; each with a row of short setiE. 

 densely scaly, uniformly dark piceous, concealing the punctures. Beneath 

 covered with dirty brown scales, rather larger than above; punctures shallow, 

 close. Legs densely scaly, stout, tibife broad, compressed and distinctly bisinuate 

 within. Third tarsal joint scarcely longer and wider than the second; fourth 

 as long as the others combined: finely pubescent beneath. Length 4. .5-5 mm. : 

 .18-.20 inch. 



S . Last ventral with a rather large impression, not emarginate. 



9 . Last ventral with apical fovea, slightly emarginate. 



JJab. — Montana, Dakota, Wyoming. Three specimens in INIi-. 

 Dike's collection. 



Ifl. alternatus n. sp.— Oblong, subdepressed ; piceous brown; densely 

 scaly above, almost glabrous beneath. Scales matted together by an exudation 

 from the derm, giving the insect a somewhat crusty appearance and completely 

 concealing the sculpture beneath; very similar in form and general appearance 

 to M. tenebrosHs, but much smaller. Rostrum rather stout, as long as the thorax : 

 scarcely wider at base than apex, slightly narrowed about the middle; sharply 

 tricarinate : scrobes profound, their upper margin prolonged as a supraorbital 

 ridge, between which and the eye there is a distinct sulcus. Head transverse, 

 .subconvex. Thorax transverse, almost twice as wide as long, subquadrate, 

 scarcely wider at base than apex; base rounded, hind angles oblique, sides 

 straight, obscurely sinuate about the middle, gradually narrowed, but not con- 

 stricted at tip ; disc indistinctly impressed each side behind the apex ; another 

 oblique impression each side behind the middle; a small, denuded spot shows 

 surface densely and finely punctate. Elytra one-fourth wider than the thorax, 

 same form as in tenebrosns, but not compressed toward the apex; alternate in- 

 terspaces subcostate, with a row of rather stout, conspicuous setiB. Striae well 

 impressed, punctures large and very approximate. Beneath almost glabrous, 

 coarsely and densely punctate, each puncture bearing a short setae. Legs mod- 

 erately stout ; tarsi with the third joint one-half longer than second, fringed 

 with long pubescence. Length 3.5 mm. ; .14 inch. 



A unique specimen, a % , in Mr. Ulke's collection is before me. 

 The last ventral is faintly impressed near the apex. This species 

 can hardly be confounded with any other Macrops known to me. 



Hab. — Illinois. 



