The Sycamore Lace-Bug 



11 



ture gives the nymph a very formidable and characteristic appear- 

 ance. 



In addition to these two general types of prominent spines are 

 many minute spinules on the body surface, except in the first 

 instar on which they do not appear. They are recurved, sharp, 

 width at base almost half the length, and are well distributed over 

 the entire body surface, being especially prominent on the base of 

 the protuberances. These spinules are difficult to distinguish, 

 even with the hand lens, but are quite evident under the micro- 

 scope, giving the exterior a roughened, granulated appearance. 



All the instars are flattened dorso-ventrally, this being espe- 

 cially pronounced in the last three stages, where the aymphs are 

 much broader and more ovate. 



At the posterior margin on the mid-dorsal line of the third and 

 fourth abdominal segments are two apertures or openings of the 

 "scent glands". The feet are composed of two segments, a small 

 basal one and a larger, much longer distal one .bearing two promi- 

 nent -claws. The last segment of the abdomen is rounded with the 

 tip strongly deflected as if standing on the anal end, when viewed 

 from the side. The abdomen is made up of ten segments. 



Figure 5 Corythucha ciliata. Say; a, fifth rnstar; b, fourth instar; c, long, cylindrical 

 protuberance showing annulations with minute spinules (original) 



Growth of the Young by Molting 



After hatching the poung pass through five stages or instars 

 before the adult form is reached. Growth or the increase in size 

 is accomplished by casting the skin or molting as the body be- 

 comes too large for it. This takes place by the splitting of the 

 skin at the mid-dorsal line from the head as far back as the sec- 



