8 BULLETIN" 689, IT. S. DEPARTMENT OF AGRICULTURE. 



In molting the skin splits down the median line of the thorax and 

 at the juncture of the head and thorax on the dorsal surface. Through 

 this opening the nymph gradually works its way, leaving the entire 

 covering of the body behind. 



FIRST-STAGE NYMPH. 



Ovate, strongly convex above, less so below. Body and appendages with short, 

 scattered setae. Antennae, beak, and legs long and stout. Antenna four-jointed; first 

 joint shortest, second and third of about equal length, fourth longest, largest at middle 

 and approaching point at tip. 1 Four-jointed beak reaching beyond base of abdomen. 

 Eyes prominent. Claws simple, two in number, each with pulvillus. Divisions of 

 body and segments of thorax, and to less extent segments of abdomen, marked by 

 indentations along edge. 



As the nymphs issue from the eggs they are colored as follows: Eyes and a triangular 

 area on top of head, one edge extending from lower point of one eye to lower point of 

 other eye, crimson; remainder of head yellowish white. Thorax and abdomen golden 

 yellow except for traces of transverse crimson lines which, between thorax and ab- 

 domen, form a transverse band. Antennae, beak, and legs without color, nearly trans- 

 parent. 



Until the time of the first molt, when the nymphs attain a length of about 1.6 mm. 

 and a width of 1.1 mm., they become gradually darker. 



The following notes refer to their coloration just before molting: 



Dorsal surface. 



Head: Eyes deep red. Triangular area on head crimson or brown. At least area 

 at base light yellow. Rest of head sometimes brown or in part yellow. 



Thorax: Central portion of prothorax and mesothorax light yellow, the sides and 

 rear of this area sometimes tinged with red. Sides of prothorax and mesothorax 

 reddish brown or brown, with yellow sometimes present along edge. Metathorax 

 reddish brown or brown. 



Abdomen: Usually darker than head and thorax. For the most part dark brown, 

 sometimes almost black. White spot on either side near base. Three glands, the 

 anterior one being much narrower than the other two, reddish brown with cream- 

 colored spot behind and to either side of last two. Somewhat semicircular, usually 

 yellowish spot on either side of each segment, its straight edge along edge. 



Ventral surface. 



Head: Light yellow tinged with red. Antennae light yellow with last segment 

 somewhat dusky at tip and with crimson areas on joints near and at junctures. Beak 

 light yellow with dusky tip. 



Thorax: Light yellow tinged with red. Legs of same color with last segment of 

 tarsi somewhat dusky. 



Abdomen: Darker than head and thorax, having dusky tinge, especially a band 

 down either side extending from edge about half way to median line, containing along 

 the edge yellow semicircular spots corresponding to those found on dorsal surface. 



Sometimes the whole under surface is dusky and the coloration not as distinct as 

 above indicated. 



SECOND-STAGE NYMPH. 



Shape and relative length of segments of antennae and beak much as in first stage 

 Sometimes almost entirely black after molting. 



The following color notes refer to mature individuals: 



1 See Table I, giving lengths of antennal segments, p. 11. 



