42 WILLIAM G. DIETZ, M. D. 



The two species constituting tlie present group are distinguished 

 as follows : 



Larger, thorax densely and coarsely punctate; elytral punctures smaller. 



(leliiinbis. 

 Smaller, thorax not very densely, cribrate-punctate ; elytral punctures larger. 



siibcribratiis. 



ifl. <lellilllbif$ Gryll. — Elongate, piceous, rather sparsely covered with pale 

 scales ; beak moderately stout, shorter than the thorax, slightly widened toward 

 the apex; tricarinate, median carina more prominent; longitudinally rngoso- 

 punctate, separated from the front by a transverse groove: sparsely clothed like 

 the head with yellow filiform scales and four rows of short, suberect setse. Head 

 transverse, subconvex, densely and finely punctate, each puncture bearing a 

 short, scale-like hair; a supraorbital ridge and sulcus. Thorax subquadrate, 

 slifihtly narrowed at apex and less than one-half wider than long; sides broadly 

 rounded, not constricted at tip; coarsely and confluently punctate, each puncture 

 bearing a short, yellowish hair; median vitta generally obsolete, lateral one 

 distinct, of whitish scales. Elytra one-half wider than the thorax ; parallel for 

 two-thirds, then gradually narrowed to and conjointly rounded at tip. Striae 

 fine, punctures moderate, rather distant; interstices scarcely convex, third, fifth 

 and seventh a trifle more so, alternately with a row of rather long, slender and 

 somewhat clavate setse. Beneath glabrous, densely and coarsely punctured, each 

 puncture bearing a short seta. Legs not stout, fenioi'a moderately clavate. in- 

 fuscate about the middle. Tibise slender; posterior ones of the male with a 

 brush of long flying hair. Tarsi with the third joint deeply bilobed, almost 

 twice as long as the preceding ; last joint slender, as long as the others combined ; 

 anterior and middle tarsi moderately dilated, posterior ones narrow, .slender. 

 Length 3.5-4.5 mm, ; .14-18 inch. Plate J, figs. 11, 116. 



% . Last ventral segment transversely impressed, rai-ely a well 

 marked fovea. 



9 . Last ventral with a large, oval or subquadrate, j^-ofound 

 fovea. 



A very variable species. The appearance varies from grayish 

 white to dark piceous. 



Hab. — .Specimens are before me from Pennsylvania, Iowa, Northern 

 Illinois, District Columbia, Montana, Nevada, Nebraska. 



91. subcribratus n. sp. 



Differs from the preceding species by its smaller size ; the thorax 

 coarsely cribrate ; elytral punctures larger, as wide, or even wider 

 than the interstices. Length 3.5 mm. ; .14 inch. 



Two specimens, males, one in Mr. Ulke's collections and one in 

 my own are before me ; the last ventral has a large quadrate im- 

 pression. 



Hab— Florkhi. 



