NORTH AMERICAN PSYLLID^. 69 



II. SUB-FAMILY APHALARIN^E. 



3. Aphalara iliris, Ashm. (Psylla ilecis Ashm.) 



This sub-family was established by Low upon genera in which the 

 petiolus cubiti is as long as, or longer than, the discoidal part of the 

 subcosta, and in which the frontal lobes are either absent or not 

 separated from the vertex. Of the four European genera of this 

 sub-family recognized by Franz Low I have thus far seen American 

 representatives of but one genus, viz : Aphalara, which appears to 

 be well represented in the United States. 



III. SUB-FAMILY PSYLLIN^E. 



4. Calophya rhois Glover.* (Psylla rhois Glover.) 



5. Psylla pyricola Forster, (synonyms Ps.pyri, Harris, Fitch, 



Glover, etc. ; P. pyrisuga Barnard.) 



This is the Pear-tree Psylla of our northern and western States, 

 and its reference to Forster's species is made after comparison with 

 European specimens received from Meyer-Dur and Lichtenstein. 



6. Psylla quadrilineata Fitch. 



7. Psylla arctica, Walker. (Aphalara arctica Walk.)f 



8. Psylla carpini Fitch. 



* It was one of Glover's boasts that he never described a species : yet on ac 

 count of the marked colorational characters of this insect, he has unwittingly 

 given, in two or three words, a recognizable description of it with figures. (Agri 

 cultural Report for 1876, p. 33, published in 1877.) The name conflicts with 

 Fr. Low's Calophya (Psylla) rhois, also published in 1877, (Abh. K. K. zool. 

 bot. Ges. Wien, 1877, p. 148.) Without attempting to decide which of the two 

 names has priority, but to avoid confusion, I would substitute for our North Amer- 

 can species the name of nigripennis, under which Fitch described the species in 

 his manuscript notes. Low's description is a very careful one, while that of 

 Glover is accidental and unintentional, the name being used under the impression 

 that the species had already been described. 



fThis is described from Albany River, Hudson's Bay, (List of Homoptera, 

 Brit. Mus., part 4, p. 931,) as an Aphalara. It is unknown to me, but Mr. Jno. 

 Scott, (Trans. Ent. Soc. London, 1882, p. 459,) who has examined the types, 

 declares it to be a genuine Psylla. 



