18 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.75 



moderately long setae in the margin. Ventral part of ninth segment 

 transverse, carrying band-shaped sclerite with two setae on each side. 



Tenth abdominal segment. — ^With four anal lobes, the lateral one 

 on each side large and round. 



Habits. — Nibbling on the upper surface of floating leaves of water 

 lilies and many species of Polygonum., leaving the epidermis intact 

 on the under side. Larva fastens itself by its tail end to the leaf 

 before transforming into pupa; last abdominal segments of pupa 

 covered by larval skin. According to J. P. Kryger " also found on 

 MentJixiy from which plant it was reared. 



Literature. — 



MacGillivray, a. D. 



1903. New York State Museum, Bull. 68, pp. 325-326, pi. 27, figs. 8 and 9 

 [both incorrect] and pi. 31. 

 Chittenden, F. H. 



1905. U. S. Dept. of Agri., Bur. Ent. Bull. n. s., No. 54, pp. 59-60. ("So 

 abundant in the District of Columbia that the imagines deserted the 

 natural aquatic food plants, as Nymphaea, Sagittaria, Brasenia, and 

 Nuphar, and attacked near-by plants of other families, such as basket 

 willow and beans, doing considerable damage.") 

 Woods, W. C. 



1924. Maine Agr. Exp. Sta. Bull. 319, p. 134. 

 Hbneiksen, K. L. 



1927. Danmarks Fauna No. 31, p. 348. 



GALERUCELLA LINEOLA Fabricins 



( U. S. Nat. Mus. ; described from larva in vial marked : " On Eumex sp. 

 Seeland, Denmark, E. A. Rosenberg collected, reared, and dedit.") Reared. 



No characters have been found by which the larva of this species 

 can be definitely separated from the larva of G. nymphaeae. It 

 pupates also above the ground attached to a leaf, and with the end 

 of the abdomen covered by the skin of the last larval instar (seen 

 on material in the U. S. National Museum). 



K. L. Henriksen records as food plants of G. lineola only SaUx 

 and Alnus, whose leaves it skeletonizes, but E. A. Rosenberg has 

 added Rumex species. Chittenden mentions (see literature on 

 G. nymphaea) that adults of the species of G. rmfm^phaea occasionally 

 feed on salix. 



GALERUCELLA. SAGITTARIAE Gyllenhal ( = G. GBISESCENS Joannia) 



(U. S. Nat. Mus.; larva described from vial marked: "On the leaves of 

 Potomogeton species, Douse, Denmark, 26 July 1925 ; imago developed 3 

 August 1925. E. A. Rosenberg leg. et ded.") Reared. 



The larva of this species can not be distinguished from that of 

 G. nymphaeae. 



"Entom. Medd. Copenhagen, vol. 13, 1919, p. 38. 



