152 
IOWA ACADEMY OF SCIENCES. 
((7. .T^eiw) cut lengthwise to show nectary. Fig. 4. New White 
Gem Water Welon with perfect flowers. Figs. 5 and 6. Long 
warted; fig. 5, one flower cut lengthwise to show nectary, the 
other shows an opening near base. All natural size. Drawn 
by Charlotte M. King, and pollen grains drawn by L. H. P. 
PSYLLID^ POUND AT AMES. 
BY C. W. MALLY. 
While studying Hackberry Psyllidse last year, several other 
interesting species were found. This led to a general study of 
the family as represented in this locality. It wms the original 
intention to give a general account of the anatomy and life his- 
tory, with descriptions of new species. However, only the 
latter part is given at this time. 
One important fact has been brought out again during this 
study, and that is that in order to generalize in regard to any 
group of insects, we should have a good representation of the 
species. Many statements that would be true for a small repre- 
sentation may need to be considerably changed in order to 
include other nearly related forms, which may not only show 
valuable structural characters, but in their life history present 
phases of development having an important bearing on other 
facts at hand. 
Another thing of importance is to know, so far as possible, 
what has been done. To show this in the present instance, the 
best way will be to give a list of the American species already 
described. Dr. C. V. Riley, in Proc. Biol. Soc. Wash., v. 2, p. 
67, gave a list and the synonomy up to that time. Since then 
quite a number of new species have been described and so 
many new facts brought to light that it seems best to present 
them altogether, showing clearly the synonomy, the species 
since recorded, and for the benefit of those interested in the Iowa 
fauna, indicate the species found here.* 
^Note.— The following list was prepared in connection with a bibliography of the 
family. The most important paper in this connection is the one by Dr. O. V. Riley 
just mentioned, and the synonomy is the same as there recorded. The names of the 
species recorded since that list was published were taken, as far as possible, from the 
articles in which they were first mentioned. Inaccuracies were avoided as much as 
possible. If it proves to be of value to other investigators and induces them to publish 
their observations on this family, it will have served its purpose. 
