IOWA ACADEMY OF SCIENCES. 
153 
Beginning with genus Livia, we find the described species 
to be as follows: 
FAMILY PSYLLID^. 
I. SUB-FAMILY LIVIIN^. 
1. Livia vernalis, Fitch. (Ames, la.) 
Dirapliia femoralis, Fitch. 
Dirax)liia calamorum, Fitch. 
2. Livia maculipennis, Fitch. (Ames, la.) 
DirapMa maculipennis, Fitch. 
II. SUB-FAMILY APHALARIN^. 
3. Aphalara ilicis, Ashm. 
Psylla ilicis, Ashm. 
4. Aphalara calthea, Linn.^ (Ames, la.) 
III. SUB-FAMILY PSYLLIN^. 
5. Calophya rhois, Glover.^ 
6. Calophya vitripennis, Riley. 
7. Calophya nigripennis, Riley. 
8. Calophya fiavida, Riley. 
9. Psylla arctica. Walker. 
Aphalara arctica. Walker. 
10. Psylla quadrilineata, Fitch.* (Ames, la.) 
11. Psylla carpini, Fitch. (Ames, la.) 
12. Psylla annulata, Fitch. (Ames, la.) 
13. Psylla pyricola, Forster.^ 
Psylla p%jri, Harris, Fitch, Glover, etc. 
Psylla ptyrisuga, Bernard. 
14. Psylla buxi. 
15. Pachypsylla venusta, O. S. 
Psylla venusta, O. S. 
Pachypsylla celtidis-grandis, Riley. 
*The specimens in collections marked Psylla quadrilineata, Fitch, agree perfectly 
with the specimens of Aphalara polygoni found here. So it must be the same as the 
European species mentioned, or else we have not seen a specimen of the real Psylla 
quadrilineata, Fitch. 
iMentioned in bulletin 102 of Mich. Ag. Exp Sta. as being injurious to celery. 
2In a foot note of Dr. Eiley’s article, Proc. Biol. Soc. Wash., v. 2, p. 67, he substi- 
tutes the name of nigripennis for rhois. In his next paper, “ Psyllidm of the United 
States,” Proc. A. A.. A. S , v. 32, p. 319, Calophya nigripennis is included as a new species. 
I conclude that the old name, Calophya rhois Glover, is retained and another species, 
Calophya nigripennis Riley, added as shown above. 
^Psylla pyricola Forster has been carefully studied by Mr. M. V. Slingerland, of 
Ithaca, N. Y., and the results given in bulletin 44 of the Cornell Exp. Sta. He found it 
to be dimorphic, and designated the summer form as Psylla pyricola pyricola, and the 
winter form as Psylla pyricola simulans. 
