THE CANADIAN ENTOMOLOGIST 21 



ity abruptly tapering to point ; dorsal hairs more pronounced ; abdominal segmen- 

 tation more distinct. Legs whitish. Sizes of individuals vary greatly. Some 

 specimens suboval in outline, many elongate, some with greatly distended bodies. 



Third nymphal stage. Length 0.7 mm. to 0.8 mm. Width of head be- 

 tween eyes 0.26 mm. Form elongate. 



Lemon yellow to orange with faint transvers^e dorsal markings. Antennae 

 and legs whitish. Thorax subquadrate; sides of abdomen subparallel or strongly 

 arcuate, with pointed tip. Sides of 2nd and 3rd thoracic segments slightly 

 produced laterally and somewhat posteriorly. Extremity of abdomen brownish. 

 Segmentation more distinct than in preceeding stage. Extremity of abdomen 

 terminating in 2 minute spines or processes directed upward. Dorsal surface 

 of body especially posterior portion of abdomen bearing numerous fine erect hairs. 



Fourth nymphal stage. Length 0.91 mm. to L34 mm. Width of head 

 between eyes 0.38 mm. Shape somewhat similar to that of preceeding stage. 



Somewhat chunky. Colour lemon yellow with faint transverse orange 

 markings. Last 3 abdominal segments closely united and brownish. Antennae 

 whitish with faint brownish bands. Thorax subquadrate, sides of abdomen 

 strongly arcuate. Insect widest across abdomen. Abdomen flat or subglobular. 

 Wing-pads whitish, much more prominent and larger and strongly directed 

 laterally and slightly posteriorly. Legs whitish, articulations dark. Hairs on 

 head, thorax and abdomen more pronounced, those on abdominal segments 

 long and arranged in transverse rows. 



Fifth nymphal stage. Length L8 mm. to 2.3 mm. Width of 

 head between eyes 0.6 mm. to 0.7 mm. General colour yellowish 

 with faint orange to red transverse markings. Wing pads, legs, last 

 three abdominal segments brownish. Antennae sparsely hairy, about 

 as long as width of head and banded alternately with white and brown. Eyes 

 prominent, lateral, red. Head transverse with an irregular brown spot on 

 dorsal surface either side of middle. Thorax subquadrate in distended speci- 

 mens. Wing-pads of meso- and metathorax extending posteriorly to second 

 abdominal segment. Abdomen subglobular, sides strongly arcuate. Body 

 widest across abdomen. Abdomen consisting of 8 segments, last 3 strongly 

 chitinized, dark brown, terminating in a point; abdominal segmentation pro- 

 nounced, except in last 3 segments which appear to be somewhat fused. Abdo- 

 minal segments 6, 7 and 8, especially 7 and 8, bearing numerous minute tubercles 

 each bearing a hair. Anal segment consists of a horny process bearing minute 

 teeth or tubercles at its base. Dorsal surface of body, especially posterior 

 part of abdomen, bearing fine white hairs. Legs brownish, light on ventral 

 surfaces. Tibiae bearing several minute spines and hairs. Ventral surfaces of 

 thorax and abdomen yellowish or yellowish red except for several pairs of median, 

 brownish abdominal spots and the dark markings of last three segments. 

 Rostrum extending to between 1st and 2nd pairs of legs, tip dark. 



During the last of May and first part of June the dorsal surface becomes 

 bluish green with orange to red markings. Together with the dark areas, this 

 gives a very attractive appearance to the nymph. The abdomen swells, be- 

 comes circular in outline, and the narrowest part of the body is across the 1st 

 abdominal segment. The first 5 abdominal segments become bulged and 

 slight tubercular processes appear on the sides. Many of the specimens measure 

 3 mm. in length and 1.8 mm. across abdomen at this time. 



