712 



APPENDIX. 



with much tenacity. When very numerous every stalk is killed. 

 Some fields two or three years ago were wholly destroyed by this in- 

 sect. Among plant house insects may be noticed the white scale bark 



Fig. 664. 



Larva of Leiopus xunthoxyli. 



louse (Aspidiotus bromelice 

 Bouche, fig. 6, magnified ; 4, 

 young magnified; 4a, end 

 of body still more enlarged). 

 It is often destroyed by a 

 minute chalchid fly, Cocco- 

 phagus(?). Boisduval's fern 

 bark louse (Lecanium Jilicum 

 Boisd., fig. 7 a, scale enlarged 

 seen from above ; 7&, the 

 same, seen from beneath, 

 and showing the form of the 

 body surrounded by the 

 broad, flat edge of the scale ; 

 7c, an antenna, enlarged; 

 7d, a leg, enlarged ; 7e, end of the body, showing the flattened hairs 

 fringing the edge), is common on hot-house plants, as also the Platy- 

 cerium bark louse (Lecanium platycerii Pack., fig. 5, magnified; 5a, 

 an antenna, enlarged), and the plant house Coccus (C. adonidum 

 Linn., fig. 3, magnified). The plant house Aleurodes (4. vaporarium of 

 Westwood, fig. 9, enlarged; 9a, pupa enlarged), is more common per- 

 haps than one would suppose. It lives out of doors on tomato leaves 

 and we found it not uncommon, in September, on strawberry plants on 

 the grounds of the State Agricultural College, at Amherst. The list of 

 liot-house insects is completed by one of the most injurious of all, the 

 mi mte Thrips (Heliothrips hcemorrhoidalis Haliday), from Europe, fig. 

 2, greatly magnified, which by 

 its punctures, causes the sur- 

 face of the leaf affected to turn 

 red or white, while at times 

 the entire leaf withers. 



Fig. 10 represents the Cran- 

 berry weevil, Anthonomus su- T 

 turalis Leconte ; 10a, its larva, 

 mentioned on p. 487. Fig. 12 1 

 represents the Byturus uni- 

 color Say. (enlarged) which 

 feeds on the flowers of the 

 raspberry. 



Explanation of Plate 15. 

 Fig. 1, Leiopus facetus Say, the 



larva of which bores in the branches of the apple tree. Fig. 2, Leiopus 

 xanthoxyli Shimer. -which bores under the bark of the prickly ash. 



Larva of Callicliuni amoenum. 



