454 AVILLIAM G. DIETZ, M.D. 



than wide, alternate interspaces wider, with tufts of elevated scales ; 

 prosternum long in front of the coxse, narrowly and deeply eniar- 

 ginate, aute-coxal ridges acute ; mesosternum depressed between the 

 coxae, transversely sulcate ; metasternum shorter than the first ven- 

 tral segment •, first and second ventral segments longer than the 

 three following, separated by a straight suture, segments 3-5 equal ; 

 anterior coxae prominent, rather narrowly separated, middle coxae 

 more widely separated, not enclosed within by the coxal cavities ; 

 femora toothed, tibite widened to the tip, tarsi narrow, third joint 

 scarcely wider than the others, claws approximate at the base, simple. 



A very peculiar insect forms the type of this genus. The meso- 

 sternum being depressed between the coxae gives a deceptive appear- 

 ance of being canaliculate and forming i)art of the pectoral canal. 

 The broadly excavate and expanded front, the equal length of the 

 three last ventral segments and the narrow tarsi, form a complex of 

 characters which does not j)ermit the reception of the single species 

 into the old genus Ceuforiu/nehus. It is from a profound regard to 

 the memory of that eminent and lamented scientist. Prof. C. V. 

 Riley, that I dedicate this genus to his name. 



Represented by a single species. 



R. relictus n. sp. PI. xiv, figs. 32, 32a. 32&.— Oblong elliptic, dark piceous, 

 above densely clothed with large, imbricate scales, varying in color from pale 

 ochreous to dark brown, underside clothed with dirty ochreous, densely matted 

 scales. Beak curved in its basal half, shining, finely punctured, striate near the 

 base; antennae slender, inserted two-fifths from the base ( 9 ). scape not attiiining 

 the eye, funicle 7-jointed, first joint stout, outer joints gradually decreasing in 

 length, concavities of the head densely clothed with pale scales, frontal excavation 

 with a longitudinal, ridge-like elevation ; prothorax about one-half wider than 

 long, sides straight for two-fifths their length and slightly convergent, then rapidly 

 narrowed in front, apex broadly and strongly constricted, profoundly impressed 

 about one-third behind the anterior margin, the latter strongly elevated, deeply 

 and narrowly emarginatc at the middle, ocular lobes prominent, a transverse 

 ridge extending from the i)romineut, but obtuse, lateral tubercles across the disc, 

 semi-interrupted by the dorsal channel and bearing several acute denticles each 

 side, disc in front of this ridge precipitous, dorsal channel profound, entire, nar- 

 rowed from the middle both towards the apex and the base, punctures concealed 

 by the scaly vestiture, the latter intermixed with erect, blackish claviform scales, 

 directed forward, a median line and one each side of pale scales. Elytra nearly 

 one-third wider at the base than the prothorax, humeri rounded, prominent, 

 sides nearly straight from the Immeral prominence for three-fourths their length, 

 then rapidly rounded to the apex, strise impressed, sculpture completely concealed 

 by the scales, interspacres alternately wider, convex, the dark brown velvety 

 scales erect, forming elongated spots on the wider interspaces, alternating with 

 pale spots of aj)pressed scales, each interspace with a row of dark brown, erect 



