schaeffer: donaciini of the new world. 53 
To all my warmest thanks are due for the kind and ready responses 
to my request for the loan of material and also for other favors received. 
This large amount of material has made it possible to become thoroughly 
acquainted with this difficult group of insects and also added greatly to 
the knowledge of the distribution and food habits of our species. 
The figures on plate V were made by Mr. Chris. E. Olsen. 
The sequence of the species in the keys below is by no means natural; 
that is, species having a superficial resemblance are occasionally widely 
separated in the table. In the list of species, following the descriptions, 
the sequence of the species is more natural; however, some are rather 
aberrant and do not seem to fit anywhere, no matter where they are 
placed. 
Tribe Donaciini. 
The species of the tribe Donaciini are distinguished from other 
Chrysomelidae by having the front of head normal with a distinct, 
generally deep, longitudinal median impression and the mouth is ad- 
vanced; the eyes are entire and. the antennae are generally slender and 
inserted before the eyes. The prothorax is not margined laterally and 
always narrower than the elytra. The elytra are sub-triangular or sub- 
parallel and depressed or convex, apices rounded, truncate or emarginate. 
The anterior coxae are prominent and nearly touching each other and 
the cavities are closed behind and externally angulate. The middle 
coxae are rounded and separated; the posterior coxae are oval and widely 
separated. The front and hind tibiae have more or less distinct spurs. 
The claws are simple or feebly appendiculate. The first ventral segment 
is long, frequently as long or longer than the following segments to- 
gether; the middle ventral segments are not narrower than the others. 
The two genera of this tribe represented in our fauna are principally 
known by the great difference in the structure of the tarsi. 
Key to Genera 
Tarsi slender, not dilated, nearly glabrous below, third joint entire, 
very small, much shorter than second; claw joint very long, 
nearly as long as the preceding joints together; claws simple, 
narrow Haemonia Latr. 
Tarsi dilated, spongy beneath; third joint deeply bilobed, as long or 
longer than second and never much shorter than second; claw 
joint short, rarely as long as the two preceding joints; claws 
slightly appendiculate at base Donacia Fab. 
