74 THE GENUS CORYTHUCHA 



CORYTHUCHA Sikl 

 1873. Corythucha St&l, Enum. Hem., iii, p. 119. 



Pronotal hood entirely concealing the head, with apex reach- 

 ing a little in front of the head. Rostral sulcus uninterrupted 

 by a transverse carina. Antennae rather long and slender and 

 beset with bristly hairs; first segment at least twice the length 

 of the second; second segment ver}' short; third segment con- 

 siderably longer than the first two taken together; fourth seg- 

 ment shorter than third, and more or less swollen. Paranota 

 broad, armed on the outer margins with spines. Elytra nar- 

 rowed at the base with outer margin strongly refiexed anteriorly, 

 with a tumid elevation near the antero-inner margin. The 

 nervures of hood, paranota, and the elytra irregularly armed 

 with a few erect spines. 



Key to the Species ^ 



1. Crest of pronotal hood at least twice as high as median carina 2. 



Crest of pronotal hood not twice as high as median carina 22. 



2. Costal margins of el3'tra entirely embrowned. 



bulbosa Osborn and Drake (1) 

 Costal margins of elytra not entirely embrowned 3. 



3. Length of median carina one-fourth the length of hood, lateral carinae 



almost obsolete decens St§,l (39) 



Length of median carina distinctly more than one-fourth the length of 

 hood, lateral carinae more or less prominent 4. 



4. Costal margins of elj^tra distinctly concave 5. 



Costal margins of eljlra nearly straight 9. 



5. Apical portion of eljlra crossed by two brown bands 6. 



Apical portion of elytra crossed bj^ a single band 7. 



6. Species small, narrow morrilli Osborn and Drake (38) 



Species large, broad laclea Drake, new species (35) 



7. Apical band ■nndc, solid bro'wn 8. 



Apical band narrow, more or less indistinct incurvata Uhler (32) 



8. Paranota with large brown spot occidentalis Drake, new species (28) 



Paranota without spot coryli Osborn and Drake (30) 



9. Length of hood noticeably greater than length of median carina 10. 



Length of hood not greater than length of median carina 20. 



10. Height of hood distinctly greater than length of median carina. 



associata Osborn and Drake (4) 

 Height of hood not distinctly greater than length of median carina. ... 11. 

 ^ The number, in parenthesis, occurring after the specific name indicates the 

 order in which its description occurs in the list of species. 



