118 



INSECTS INFESTING THE PEAR TREE. 



obtain their nourishment by puncturing the twigs with their 

 beaks and imbibing the sap. The larvae, or young, are of a dull- 

 orange color, and are obtuse l)ehind. (Pupa, Fig. 90). The per- 

 fect or winged insects (Fig. 91) are a little over a line long to 

 the tip of the closed wings ; the eyes are large and prominent ; 

 the head and thorax are of a brownish-orange color, and the 

 abdomen is greenish ; the wings are transparent. I have 

 found this species in one orchard only, and not sufficiently 

 numerous to do nmch damage to the trees infested. 



Fig. 90. 



Fig. 91. 



Fig. 90. — Pupa of Pear-tree Psylla, highly magnified — col- 

 ors, orange-red and black ; o, ventral view ; 6, back view. 



Fig. 91. — Pear-tree Psylla, enlarged — colors, orange-red and 

 black. 



Remedies. — Trees. 'infested the previous 3'Gar should, when 

 dormant, be thoroughly sprayed M-ith No.* 13 — five pounds of 

 mixture to six gallons of water. In April, spray with Nos. 5 

 or 7. Repeat the spraying in two weeks, if necessary. 



CHAPTER LXI. 



The Pear Slug. 



(Selandria cerasi — Peck.) 



Order. Hymenopter.^ ; Family, Tenthredinid.e. 



[A small twenty-footed caterpillar, covered witli a sticky 

 olive-colored slime, infesting the foliage of the pear and elu'rry 

 trees.] 



The specific name, cerasi, given to this saw-fly, places this 



