1915] FmikJionaer — JAfe History of Vanduzea Arquata Say 195 



distinctly upraised. Legs uniform gray, very hairy; tarsi ferruginous. From a 

 nymph killed and described immediately on its emergence from the egg. 



During this instar the nymph increases in length about .6 mm., and gradually 

 becomes darker in color. 



Second Instar. 



Measurements: Length 2-2.5 mm.; maximum width .5-. 8 mm. 



Dark brown, lighter on dorsum, top of head white; median dorsal line distinct, 

 a row of bristles down each side of median dorsal line; abdomen broad, tip upraised; 

 sides of tjiorax and abdomen hairy, hairs not in rows. 



Head broad, dark brown except dorsal apex which is white; produced above, 

 dorsal apex in two tubercles; very faintly pubescent; eyes reddish, borders white; 

 ocelli small, white; antennae very small; clypeus long, distinct; beak extending to a 

 point half way between hind coxae and tip of abdomen, mandibular and maxillary 

 setae capable of extension as far as tip of abdomen. Thorax brown, lighter above; 

 each segment with one pair of strong dorsal bristles and many lateral hairs; pro- 

 thorax longer than meso or metathorax and provided with a pair of strong hairs 

 anterior to bristles; meso- and metathorax subequal. Abdomen reddish-brown, 

 dorsal region lighter, underside red, last segment and anal tube very dark brown; 

 each segment with a pair of dorsal bristles and many short, stiff, lateral hairs 

 irregularly arranged; last segment twice as long as the one before it and bearing 

 two pair of dorsal bristles. Legs mottled brown above, almost white below, not 

 hairy; tibiae with brown patches above; tarsi yellow-white; claws ferruginous. 



Third Instar. 



Measurements: Length 2.5-3.5 mm.; maximum width 1-1.3 mm. 



Red-brown; frontal tubercles of head very small; pronotum prolonged posteriorly 

 into a point partly covering mesonotum; rudimentary wing-pads distinguishable; 

 head and thorax densely pilose, abdomen sparsely pilose; no dorsal spines on thorax, 

 those on abdomen short. 



Head broad, slightly produced forward, hairy; frontal tubercles almost obsolete; 

 eyes prominent, red-brown; ocelli white, not prominent; clypeus long and triangular, 

 faintly pimctate and sparingly pubescent, suture at base very distinct; antennae 

 prominent. Thorax broader than abdomen, brown with scattered white punctures 

 densely pilose; pronotum well developed posteriorly, covering one-half of meso- 

 notum; meso and metathorax subequal, lateral margins produced to form first, 

 evidences of wing-pads; no median dorsal bristles on thorax. Abdomen with eight 

 distinct segments besides anal tube; each segment except the last bearing a pair of 

 short heavy dorsal spines, each spine ending in a fine, hair-like bristle; last abdom- 

 inal segment darker in color and densely pilose; anal tube thick, heavy, often greatly 

 distended; under side of abdomen reddish-white. Legs very light mottled brown, 

 white below; tibiae and tarsi somewhat hairy; claws strong, ferruginous. 



Fourth Instar. 



Measurements: Length 3-4.5 mm.; maximum width 1.2-1.6 mm. 



Light ferruginous brown; head large; pronotum entirely covering mesonotum; 

 wing-pads of first and second pairs of wings reaching equidistant posteriorly and 

 covering half of first abdominal segment at lateral margin. 



