schaeffer: donaciini of the new world. 115 
Pennsylvania: Frankford, June (Schmidt); Hssington, June (Wenzel) ; 
Baoba, July (Wenzel); Easton, June (Frankenfield). 
Virginia: Great Falls, May (Chapin, Biol. Surv.); Dyke, July (Jackson, 
Biol. Surv.); Fairfax Co., June (Nicolay). 
Maryland: Great Falls, May (McAtee, Biol. Surv.); Bettsville, June 
(McAtee, Biol. Surv.). 
District of Columbia : Washington, June (Nicolay, Davis) ; Eastern Branch, 
December, January, February, April (McAtee, Biol. Surv.), June 
(Nicolay); Woodridge, May (Buchanan, Biol. Surv.); Washington, 
October (Chapin, Barber, Notman). 
Ohio: Cincinnati (Dury). 
Kansas: "Kans." (coll. Wickham), 
Iowa: Fort Madison (Wickham); Iowa City, June (Buchanan, Biol. 
Surv.). 
Nebraska: "Neb." (Ulke). 
Minnesota: St. Anthony Park, July (Biol. Surv.); Ramsay Co. (Minn. 
Univ.). 
Recorded on rushes and sedges on marshy ground (Hamilton), on 
leaves of arrow-head, numerous and in copulation (Liebeck) and found 
in numbers on Sparganiaceae and Sagittaria growing together at Wenonah, 
N. J., and at Essington and Pike Co., Pa., on Sagittaria (Wenzel). 
D. aequalis should be easily recognizable by its rather short form, 
head scarcely narrowed behind the eyes, prothorax finely punctate and 
finely rugose at sides and base; lateral tubercles rather prominent and 
distinctly separated from the disk, anterior impression distinct and 
generally the elytral impressions deep. In general form it resembles 
D. pusilla Say of the sub-genus Plateumaris. 
In Genera Insectorum this species is also wrongly listed under 
Plateumaris. 
DoNACiA DissiMiivis new species. 
Female (Type): Rather robust, subconvex; color of upper surface 
metallic brown; antennae pale, joints more or less black at apex; legs 
pale, posterior femora with a feeble, dark cloud near apex; body beneath 
metallic green, the last four ventral segments more or less reddish. 
Head not constricted behind the eyes, which are rather small; 
posterior tubercles absent; finely densely rugose; median impressed 
line fine; antennae not quite reaching the middle of elytra, third joint 
distinctly longer than second, about as long as the first joint. 
Prothorax about as long as wide at apex; sides feebly convergent 
towards base; apical angles distinct but not prominent; lateral tubercle 
