222 THE CANADIAN ENTOMOLOGIST. 



Genus Psylla. 



1. P. pyri, Linn. 6. P. annulata, Fitch. 



2. P. rubi, W. & R. 7. P. urticsecolens, Fitch. 



3. P. tripunctata, Fitch. 8. P. quadrisignata ? Walker. 



4. P. quadrihneata, Fitch. 9. P, venusta, O. S. 



5. P. carpini, Filch. 



To these I now add 



THE PERSIMMON PSYLLA. 



By the middle of April this is found in considerable numbers on the 

 leaves of the young trees, with beaks inserted, almost st;inding on their 

 heads, and swaying from side to side like the motion of a vessel in a 

 stormy sea. This motion is evidently intended to assist either in inserting 

 the beak or in pumping up the juices of the tree. 



At this time they are also caught copulating, soon after which the 

 female begins depositing her eggs. These are very minute, o.oi inch in 

 length, elongate ovate, pale greenish in color, with a wavy beak benjath 

 at thick end, and a long filament at tip of smaller end, nearly the length 

 of the egg, and extending backwards over it. These are laid along the 

 margin of the leaf, without regard to regularity, the female first preparing 

 for their reception by secreting a thread-like, transparent, gummy sub- 

 stance along the extreme edge of the leaf; she then fastens them in place 

 by the beak, which adheres securely to the gummy substance. 



ITS LIFE HISTORY. 



These hatch in from 5 to 6 days (actual observation) and the leaf from 

 their punctures curls completely over them ; under this they reside until 

 just before the final transformation. The pupa then comes forth, attaches 

 itself to a leaf or twig, and changes into the perfect fly, escaping through 

 a longitudinal slit in the head and thorax. The young take from four to 

 five weeks to mature and breed throughout the whole summer. 



Like the Fig Psylla, the fall brood probably lay their eggs in crevices 

 of the bark and twigs ; these hatch at the first breath of spring, feed on 

 the tender new shoots and leaves, and are those found fully matured by 

 the first and second week in April. 



10. PSYLLA. DIOSPYRI, n. Sp. 



Egg. — Length hardly .01 inch. Elongate ovate, with a long filament 

 at apex of smaller end extending backwards to near its whole length ; a 



