18 The Ohio Journal of Science [Vol. XX, No. 1, 



covered with black or brownish black varnish-like material, 

 which sometimes hides the contour and makes the shape 

 somewhat irregular; when material is removed, egg is trans- 

 lucent. 



FIRST NYMPHAL STAGE. 



Length 0.51 mm. Greatest width 0.12 mm. Elongate- 

 elliptical; whitish or brownish white; eyes red, consisting of 

 five, distinct ommatidia; antennas white, hairy, more than one 

 third length of body; legs long, white; rostrum white, extending 

 beyond bases of last pair of legs; tubercles on head, thorax and 

 abdomen minute and bearing comparatively long hairs. 



SECOND NYMPHAL STAGE. 



Length 0.82 mm. Greatest width 0.32 mm. Brownish- 

 white ; last antennal segment club-like ; antennae almost one-half 

 length of body; tubercles somewhat more developed; otherwise 

 similar in shape, color, armature, etc., to first nymphal stage. 



THIRD NYMPHAL STAGE. 



Length 1.05 mm. Greatest width 0.55 mm. Subelliptical 

 or oval ; brownish to brownish-black ; sides of abdomen flattened 

 in this and remaining stages; rostrum extending considerably 

 beyond bases of third pair of legs; armature similar to that of 

 fourth stage, except that in addition the metathorax bears a 

 minute, lateral, dorsal tubercle on each side. 



FOURTH NYMPHAL STAGE. 



Length 1.65 mm. Greatest width 0.79 mm. Subelliptical 

 or oval; brownish-black or black; antennas white, almost one- 

 half as long as body; lobes of mesothorax rounded, quite pro- 

 nounced, extending posteriorly to second abdominal segment; 

 ventral surface and legs white, sparsely hairy; rostrum extending 

 to beyond bases of second pair legs; spines on thoracic and 

 abdominal tubercles light ; armature similar to that of fifth 

 stage nymph, except for following: Lateral edge of prothorax 

 anterior to lateral tubercle bears only two spines; lateral edge 

 of mesothorax anterior to lateral tubercle bears only two spines ; 

 swelling in centre of mesothoracic wing pad missing. 



