schaeffer: donaciini of The new world. 137 
New York: Ramapo (Schaeffer); Peekskill (Sherman); Ringwood, May 
(Dietrich). 
New Jersey: Lakehurst, May (Davis, Nicolay). 
This variety is quite distinct from the typical form by its generally 
shorter form and antennae, wider, shining and differently sculptured 
prothorax which is alike in both sexes, the very deeply emarginate apices 
of last dorsal segment and the always large, triangular femoral tooth 
of the males and females. The males are generally metallic blue, purple 
or green, very rarely cupreous. The females are apparently never blue 
but aeneous, brownish or reddish-cupreous with or without bluish tint 
or metallic green. The sculpture of elytra is frequently coarser. Several 
specimens of this form were labelled pusilla in different collections. 
Messrs. Frost and Knab have found this form on Carex stricta and 
Mr. Frost has seen specimens eating the pollen of this plant. 
Typical emarginata have been taken on flowers of marsh marigold 
(Woodruff), on flowers of spiked maple (Frost) and in Brit. Col. on 
Lysichton kamschatcense (Hopping). Prof. Needham records the larva, 
pupa, etc., on roots of Sparganium androcladium. 
D. emarginata and varieties are distinguished from allied species by 
having the last dorsal segment of both sexes distinctly emarginate at 
apex, the posterior femora relatively feebly incrassate with the tooth 
moderate or large, the finer sculpture of prothorax above and below and 
the femora always uniformly metallic. The lateral margin seen from a 
postero-lateral view is generally narrowly acute and even in almost its 
entire length, in a few specimens of the var. frosti it is more or less finely 
interrupted. 
DoNACiA METALUCA Ahrens. 
Moderately elongate; color aeneous, cupreous, metallic green, blue 
or black; antennae reddish with first joint metallic or the joints more or 
less black at apex; legs reddish, femora in apical half or more and some- 
times the tibiae towards apex metallic; body below metallic, occasionally 
the last ventral segment more or less reddish. 
Head shining, distinctly narrowed, truncate and constricted behind 
the eyes, w^hich are small and moderately prominent; median line 
distinctly impressed; surface generally not densely punctate, punctures 
frequently well separated at middle, anteriorly and posteriorly more 
closely placed; antennae rather short, not extending to the middle of 
elytra; second joint short, third a little longer and nearly as long as the 
fourth joint but shorter than the first joint. 
