PROCEEDINGS, 1916. 49 



only of importance in comparatively few cases. The damage done by the female in 

 making her egg punctures in the twigs is negligible. 



FOOD PLANTS. 



The most common food plant everywhere is the rose, but the apple, the hawthorn, 

 the strawberry, blackberry and many other plants are also attacked to some extent. 



DESCRIPTION OF LIFE STAGES. 



The following is a brief description of the various life stages of the insect: 



EGG. — Long; curved; cylindrical; tapering gradually at each end to a broadly 



rounded point. Chorion, smooth; shining. Color, white, translucent. Length. .834 



mm.; width .167mm. 



FIRST INSTAR. — Body, long; narrow; flattened. Lateral margins widest at pro- 

 thorax and mesothorax;narrowest at base of abdomen. Head.extending in front of eyes 

 for a distance equal to the length of the eyes; lateral margins converging slightly, and 

 front broadly rounded. Two long, curved hairs situated on each lateral anterior angle. 

 Prothorax, one third shorter than head; lateral margins parallel excepting at anterior 

 and posterior constrictions; caudai margin slightly procurved. Mesothorax, one-third 

 shorter than prothorax, but of equal width. Caudal margin more sharply procured 

 Meiathorax, equal in length and one-ninth narrower than mesothorax; lateral margins 

 wider caudad. Caudal margin strongly procurved. Abdomen, long; widening sharply 

 to second segment, thence tapering gradually. Each segment except the first and last 

 bears a long stout curved hair on each side of the middle line about one-half way be- 

 tween it and the lateral margin and one on each lateral margin, forming four longitud- 

 inal rows. Legs fairly long and strong, covered sparingly with fine hairs. Tarsus bear- 

 ing a pair of broad claws. Color, white, translucent, tinged slightly with yellow, es- 

 pecially at corners of thorax and proximal end of tibiae. Eyes, whitish, the centre of 

 each facet being dull red. Length, .812 to 1.025 mm.; width, .25 to .287mm. Length of 

 hind tibia, .187 to .300 mm. 



Second Instar. — Differs from first instar in size and slightly stronger tinge of yel- 

 low. Mesothorax one tenth broader than prothorax, being broadest part of body. (Tro- 

 thorax rarely the widest). Caudal margin of prothorax procurved. Length 1.181 to 1.31 

 mm.; width, .25 to .37 mm.; Length of hind tibia, .312 to 432 mm. 



Third Instar. — Similar in form to preceding instars, but wingpads slightly appar- 

 ent. Yellowish tinge rather more pronounced in parts, but general color still whitish 

 and translucent. Eyes, rather more whitish. Length, 1.62 to 2.09mm.; width, .45 to .47 

 mm. Length of hind tibia, .62 to .69mm. 



Fourth Instar. — Same as preceding instars except in development of wing-pads, 

 the metathoracic pair reaching to end of second abdominal segment. Yellowish tinge 

 slightly more pronounced. Length, 1.94 to 2.33mm. ;Width, .63 to 72mm. Length of hind 

 tibia, .62 to .73mm. 



Fifth Instar. — Body, long; narrow; flattened. Head, comparatively shorter than 

 preceding stages. Prothorax broader; mesothorax and metathorax much longer; wing 

 pads extending to the middle of fourth abdominal segment. Color, yellowish white, 

 with brighter yellow marks down the wing-pads. Eyes, white. Length, 2.43 to 2.83mm.; 

 width, .837 to .86mm. Length of hind tibia, .75 to .88mm. 



