140 SUBFAMILY X. CURCULIONIN.E. 



proximate in front; abdomen usually sloping upward. 



Tribe XIX. ZYGOPINI, p. 417. 

 ss. Byes in repose more or less covered by ocular lobes. 



t. Pygidium exposed; body broad; thorax usually with acute tuber- 

 cles. Tribe XX. CKUTORHYNCHIXI, p. 424. 

 it. Pygidium covered; body oval; elytra and thorax often tuberculate. 



Tribe XXI. CRYPTORHYNCHINI, p. 464. 



Tribe I. SITONINI. 



This tribe is represented in the United States by a single 

 genus, the species of which approach closely in general appear- 

 ance certain of the Otiorhynchids,* but are wholly without a man- 

 dibular scar. They have the mandibles short, very stout, the 

 outer side convex, roughly punctured, broadly notched at tip, the 

 inner edge acute; beak short, broad, flat, emarginate at tip; an- 

 tennal grooves deep, short, curving abruptly downwards just be- 

 hind the autennse ; scape reaching middle of eyes, funicle 7-jointed, 

 joints 1 and 2 short, thick, 3 7 shorter, subequal, club elongate, 

 ringed, wholly sensitive; eyes small, rounded; inner wings 

 present; front coxse contiguous, prominent, hind ones widely sep- 

 arated, reaching the side margin ; claws slender, divergent, ap- 

 pendiculate. Many of the species are, in the larval stage, very 

 injurious to clover, peas and other legumes. 



For literature treating of the North American species see: 



Alia rd, E.in Ann. Soc. Ent. Fr., 1864, 329. 



Casey, T. L.in Ann. N. Y. Acad. Sci., IV, 1888, 280. 



Wildennutli, T. L. 1910, 2938. 



I. SITONA Germ., 1824. (Gr., "grain merchant.") 



About 25 nominal species have been described from the United 

 States, most of them by Casey from California. Of these four, 

 common to both this country and Europe, occur in the Eastern 

 States. 



KEY TO EASTERN SPECIES OF SITOXA. 



a. Setae of elytral Intervals very distinct. 

 b. Scales of upper surface dark gray and cupreous; setae long, erect. 



178. IIISPIDULA. 

 bb. Scales grayish-yellow and pale brown; setae short, recurved. 



179. DISCOIDEA. 

 aa. Setae wholly wanting or very minute. 



c. Color nearly uniform brown; vestiture fine, hair-like, setae wholly 



wanting; length 4.5 5.5 mm. 180. FLAVESCENS. 



cc. Color steel-gray, elytra usually with paler stripes; vestiture of scales, 



setae minute; length 3 4.5 mm. 181. TIBIALIS. 



*The Sitonini were included by Lacordaire among his "Naupactides," most 

 of which are now included in Otiorhynchinie. They are treated by Reitter (igu) 

 as a tribe of Brachyderinre, nearly equivalent to Otiorhynchinae; but in the Biologia 

 Champion has followed LeConte and Horn, and Bedel in placing them first among the 

 tribes of Curculioninx, has, as we believe, given them their proper position. 



