212 CURCULIOISID^. 



[ LeConte. 



3. Beak stout; venter of (f* with acute processes PROOTORUS. 



" slender; " " unarmed ENCALXJS. 



4. Beak slender; fourth ventral suture indistinct THYSANOCNEMIS. 



" stout carinate PLOOETES. 



5. Elytra not tuberculate 6. 



tuberculate TYLOPTERUS. 



6. Tips of elytra conjointly rounded TYCHIUS. 



" " separately " 7. 



7. Claws toothed SIBYNES. 



" simplex PARAGOGES 



PROOTORUS n. g. 



This new genus is established upon a small insect which has altogether 

 the form, sculpture, and mottled pubescence of Erirhinus; it is, however, 

 easily known by the stouter beak, the curved ventral sutures, and the 

 broadly appendiculate claws. The sexual characters of the (^ are very re- 

 markable; the fifth ventral, namely, is as long as the three preceding uni- 

 ted; it is divided by a transverse sharply elevated ridge into two parts, of 

 which the anterior is the larger and broadly concave; the hinder part is 

 much more deeply concave, and on each side at the junction of the elevated 

 ridge with the margin is a stout, flattened horn, rounded at the tip; on the 

 anterior margin of the segment, at the middle, is a third shorter horn. 



Beak as long as the prothorax, rather stout, cylindrical, somewhat curved, 

 densely punctured, not striate nor carinate. Antennae inserted about one- 

 fourth from the tip ( 9 ) or less {r^); scape slender, reaching the eyes, which 

 are rounded and distant; funicle 7-jointed; first joint as long as the two 

 following, and stouter; 2-7 short, equal, gradually a little wider; club 

 moderate in size, elongate -oval, subacute, annulated; antennal grooves 

 reaching the lower margin of the eyes. Prothorax about as wide as long, 

 rounded on the sides in front, and feebly impressed near the tip. Elytra 

 wider at base than prothorax, elongate oblong, humeri prominent, rounded, 

 sides parallel; marginal stria incomplete at the middle. Ventral segments 

 unequal; third and fourth together scarcely longer than each of the others; 

 first suture straight at the sides, arched forwards at the middle; other su- 

 tures angulated at the sides. Legs rather short, thighs not toothed; 

 tibiae straight, the front pair with a small terminal hook; tarsi with the first 

 joint slightlj^ longer than the second, third broader bilobed; last joint as 

 long as the first and second ; claws divergent, broadly dilated and appendicu- 

 late at base. 



1. P. armatus n. sp. 



Black, thinly clothed with white hairy pubescence, which is somewhat 

 mottled upon the elytra. Beak densely punctured. Prothorax closely and 

 deeply punctured. Elytra with striae strongly punctured, interspaces nearly 

 flat, sparsely punctulate. Antennae piceous. Length 3.4 mm.; .13 inch. 



South side of Lake Superior; three specimens. 



