1911] Hypera and Phytonomus in America 395 



Hypera lays eggs in the fall, some larvae hatch then, others 

 the next spring. Cocoon may be formed in the ground, and the 

 meshes are very much closer than in any Phytonomus cocoon 

 known. 



Phytonomus lays eggs in the spring (so far as known); the 

 cocoon apparently never formed beneath the surface of the earth. 



TABLE OF SPECIES. 



Beak stout, never longer than prothorax. 



Large robust species, beak shorter than prothorax; hairs of prothorax and 

 elytra long and slender; scales striate, narrowed toward tip, emarginate 



without processes, concave, rounded at base Hypera punctata 



Elongate, rather stout, sides of elytra almost parallel, thorax longer than 

 broad, l>cak scarcely as long as prothorax; setae on prothorax thick, 

 numerous, scales sparse, parallel-sided, deeply emarginate. 



Phytonomus diversipunctatus 

 Beak more slender, always longer than prothorax. 



Front between the eyes narrower than eye at widest part 1 



Front between the eyes always distinctly wider than eye at widest part, 

 usually slightly concave 8 



1. Scales not at all cleft or emarginate 2 



Scales more or less emarginate 4 



Scales cleft 5 



2. Body not elongate, flattened, sides of elytra never parallel; scales trun- 



cate, concave, widest at middle, striate Phytonomus eximius 



Body elongate, flattened, sides of elytra parallel 3 



3. Thorax deeply punctured, polished; scales concave, truncate, widened at 



tip, finely striate; setae thickened at tip, more numerous on posterior 



part of elytra Phytonomus quadricollis 



Thorax not polished, punctures shallow, indistinct, glabrous, more or less 

 confluent; scales parallel-sided or narrowed at tip, thick, indistinctly 

 striate, no hairs on dorsum Phytonomus comptus 



4. Scales finely striate, deeply emarginate, sides curved; hairs thick at base 



and near tip abruptly narrowed to a point; prothorax as wide as long; 



punctures of elytral striae with minute setae. Phytonomus trivittatus 

 Scales deeply emarginate; hairs on prothorax thick, sides parallel, tip 



notched; prothorax longer than wide, setae in elytral striae short, 



thick and white Phytonomus maritimus 



Scales deeply emarginate, processes and elytral scales as long as body of 



scale; beak scarcely longer than prothorax, species small, stout. 



Phytonomus pubicollis 



5. Scales cleft nearly or quite to base 6 



Scales not nearly cleft to base 7 



6. Prothorax much wider than long, sides prominently rounded. 



Phytonomus meles 



Prothorax not wider than long, species rather narrow, elongate; hairs on 



dorsum long, fine, pointed Phytonomus nigrirostris 



7. Prothorax almost as wide as long; hairs on dorsum, especially on posterior 



part of elytra, semi-decumbent, long and pointed. Phytonomus posticus 



8. Scales of elytra cleft to or almost to base; prothorax with numerous 



emarginate hairs mixed with sparse cleft scales, front distinctly con- 

 cave, beak much longer than prothorax Phytonomus seriatus 



Scales of thorax and elytra all deeply cleft, some scales on head are cleft; 

 prothorax with sparse, thickened, blunt hairs, beak scarcely longer 

 than prothorax Phytonomus castor 



