98 THE UNIVERSITY SCIENCE BULLETIN. 



First Instar. 



Size. Length, about 1.3 mm.; varies greatly. Width of body, .216 

 mm.; length of head, .5 mm. The length of antennae, 1.49 mm. Fore 

 leg, 1.33 mm. Middle leg, 1.33 mm. Hind leg, 1.96 mm. 



Shape. More robust than later instars; given to turning tip of ab- 

 domen up as the Staphylinids do. 



Color. Body glassy with very faint greenish tinge. Just a hint of 

 darker pigment on the thorax, and a sprinkling of cinnamon on sides 

 of abdomen of older nymphs. Legs and antennae faintly amber brown. 

 Eyes coarsely granular, hemispherical and red, situated approximately 

 half way between insertion of antennae and its union with prothorax. 



Structural Peculiarities. The head is widest back of the eyes where 

 the, lateral tubercle gives off a lateral bristle. The narrowest width of 

 the head is at the constriction just in front of the eyes where the head 

 is only .125 mm. wide. The width across the eyes is .208 mm. The 

 beak reaches nearly to middle coxae. Abdomen consists of 9 segments. 

 The basal segment of the antennae carries a few bristles, second segment 

 several, while the third and fourth are thickly covered with short hairs. 

 The femora are sparsely clothed with short spiny hairs, while the tibia 

 bears many, and the single tarsal segments are densely clothed with 

 them. 



Second Instar. 



Size. Length, tip of head to tip of hind femur, 1.75 mm.; width of 

 body, — mm.; length of head, — mm.; length of antenna, 1.59 mm.; 

 fore leg, 1.345 mm.; middle leg, 1.5 mm.; hind leg, 2.125 mm. 



Shape. General shape as in adult. 



Color. Pale straw in general color. Tiny flecks of rust red on sides 

 of body and abdomen. Tarsal segments all dark. 



Third Instar. 

 Size. Length, tip of head to tip of hind femur, 3 mm.; width of body, 

 — mm.; length of head, — mm.; length of antennae, 2.13 mm.; fore leg, 

 1.7 mm.; middle leg, 2.05 mm.; hind leg, 3.03 mm. 

 Color and Shape. As in other instars. 



Fourth Instar. 

 Size. Length, tip of head to hind femur, 4-4.5 mm.; width of body, 

 .406 mm.; length of head, 1.38 mm.; length of antennae, 2.952 mm.; 

 fore leg, 2.7 mm.; middle leg, 3 mm.; hind leg, 4.1 mm. 

 Shape and Color. As before. 



Fifth Instar. 



Size. Length, tip of head to tip of hind femur, 6 mm.; width of 

 body, .47 mm.; length of head, 2.25 mm.; length of antennae, 3.54 mm.; 

 fore leg, 3.8 mm.; middle leg, 4.37 mm.; hind leg, 6.44 mm. 



The tarsi are all one-segmented in the nymphs, three-segmented in the 

 adult; roughly the various instars can be separated on basis of the 

 length of hind leg, 1 mm. 2 + , 3 + , 4 + , 6 + , for 1st, 2d, 3d, 4th and 

 5th instars respectively. The newly-emerged adults are pale greenish 

 in color, darkening gradually. 



