10 PKOCEEDINGS OF THE NATIONAL MUSEUM vol.75 



11. Abdominal segments with exterior prescutal sclerite small, about twice, or 



less than twice, the size of one of the spiracles, and located as far from 

 tbe interior prescutal sclerite as four or five times its own diameter, or 

 even farther. (Setae of moderate size and brownish.) 



Galeruca pomonae Scopoli (p. 34, fig. 12). 



Exterior prescutal sclerite three times or more the size of one of the 



spirales, and located as far from the interior prescutal sclerite as from 



two to three times its own diameter, or even nearer 12 



12. Senti generally slender and as long or longer than their diameter at base. 



Interior prescutal sclerites of the posterior abdominal segments not 

 fused in the middle line. Setae long and creamy white. 



Galeruca tanacetl Jiinuaeus (European species, p. 31, fig. 13a). 



Senti generally plump and shorter than their diameter at base. Interior 



prescutal sclerites of the posterior abdominal S'gments fused in the 



middle line. Setae moderately long and brownish Galeruca laticollis 



Sahlberg (European species, p. 34, fig. 11a). 



13. Abdominal segments with a transversely elongate scutal sclerite. No 



supra-spiracular glands Sermylassa halensis Linnaeus (p. 35, fig. 14"». 



Abdominal segments with a small round scutal sclerite. A large snpra- 

 spiracular gland lodged between the nearly contiguous anterior and pos- 

 terior parascutal sclerites Agelastica alni Linnaeus (p. 38, fig. 15). 



DESCRirTIONS AND NOTES 

 MONOCESTA CORYU (Say) 



(U. S. Nat. Mus. ; described from larva in vial marked " St. Thomas, 

 Pennsylvania, July 20, 1921; E. M. Craighead, Coll.). Reared. 



Mature larva (figs. 1, 2). — About 15 mm. long. 



Head brown and somewhat shining, epicranial suture a black 

 median line. Body dorsally dull brown and leathery with the chit- 

 inizations of about the same color, though slightly more yellowish 

 and shining; underside of body yellowish brown; legs brown and 

 shining, light colored on the inner side.^ 



Setae short to moderately long and pointed on the head, the pro- 

 thoracic and pygidial shields, the laterally projecting lobes of the 

 body and the legs; rest of body without setae or with minute setulae 

 here and there. 



Head capsule (fig. 34). — With a large, rather flat median depres- 

 sion in the f rons behind the epistomal margin ; a few deep striations 

 radiating from the middle of the depression. 



Labrv/m (fig. 35). — Subtriangular, about as long as wide, with 

 lateral margins somewhat incurved anteriorly; distal end slightly 

 cmarginate. Discal setae not fully as long as labrum ; marginal setae 

 inserted in the incurved part of labrum. five present on each side, 

 almost half as long as the discal setae. 



Mandible (figs. 45, 48). — Ruffled from base to near the middle, 

 especially on the exterior side. Four teeth present, inner margin of 



• Larva in first stage glossy yellow ; with each shedding of the skin becoming more 

 brownish. 





