New York Agricultural Experiment Station. 467 



having a uniform thickness of about .009 mm. from base to tip, and a length of .020 

 to .025 mm. 



The average measurements of forty specimens of eggs are as follows: length 2.83 

 mm.; greatest width, .62 mm.; length of cap, .51 mm.; width of cap, .51 mm. 



Nymph.— First instar (Plate XXVIII, fig. 1): Color white. Top of head with two 

 rows of ten to fifteen small bristles, directed anteriorly and each with a small black spot 

 at the base. There is a short black line extending backward from the upper edge 

 of each eye and one or two pairs of brownish transverse spots between the eyes. The 

 pronotum, and sometimes the meso- and metanotum, have a pair of longitudinal 

 brownish stripes situated close to the median line. Basal segment of antenna with 

 a small black spot on the inner side and a brownish spot on the posterior side; second 

 segment with a black transverse line on the inner side; third, fourth, sixth and ninth 

 segments with a narrow black ring at apex; each succeeding segment with faint gray 



A D c 



Fig. 31. — Snowy Tree Cricket. 



a, Egg punctures and cankers in apple wood, (X 1§); b, egg in raspberry (X 2^); 



c, egg in apple bark (X 15); d, egg cap (X 50); e, spicule of egg cap (X 500). 



annulation at tip. Hind tibiae with black spots at the base of the small bristles, 

 especially prominent on the outer and upper sides. Length about 3 mm. Antennae 

 6.3 to 7.5 mm. 



Second instar (Plate XXVIII, fig. 2) : Ground color of abdomen transparent greenish 

 white with two rows of pure white blotches on each side of median line. Basal segment 

 of antenna with a round black spot on the front and inner side, and the second segment 

 with a similar spot on the front side and a transverse dash on inner side. Outer part 

 of antennae with gray annulations on alternate segments. Length 4.5 to 5 mm. 

 Antennae 10.7 mm. 



Third instar (Plate XXVIII, fig. 3) : General color greenish white. Abdomen with 

 several rows of irregular opaque white blotches on each side of median line. The 

 brownish markings on the head and thorax are very faint. Black spot on first segment 

 of antenna on a white prominence. Length 6 to 7 mm. Antennae 13 mm. 



Fourth instar (Plate XXVIII, fig. 4) : Coloration practically the same as in the pre- 

 ceding stage. Length 8.5 to 9.5 mm. Antennae 16 mm. 



