10 Oklahoma Agricultural Experiment Station 



turn and elytra, except the posterior third, bear small, pointed 

 spines; the nervures of the hood, pronotum and elytra are also 

 armed with a few erect spines. 



The elytra bear, each a (tumid) elevation near the antero- 

 inner margin. The body is black ; the hood, pronotal margins and 

 elytra are whitish except for an irregular brown spot on the tumid 

 elevation of each wing cover. 



The Egg 



Length .5 mm.; width .16 to .18 mm. Barrel-shaped, rather 

 pointed at the base where it is glued or stuck to the leaf surface. 

 The top is not pointed and is about .1 mm. across with a cone- 

 shaped cap resting on a circular band-like base and bearing on the 

 top a number of ridges which converge from the outer margin to 

 the apex. At the apex is sometimes a thread-like filament, usu- 

 ally short. 



Color of egg, pitchy black; color of cap, a dull whitish, though 

 sometimes dark. At time of deposition the female coats the egg 

 with a black, sticky secretion (used to fasten egg to leaf, and 

 pobably serves as a protection) which gives the surface a rough- 

 ened appearance. The eggshell, with secretion removed, is 

 smooth, shiny black on upper half, as though polished, while the 

 base has a lighter greenish tinge. A group of eggs on the under 

 side of a leaf has an odd appearance, resembling little the eggs of 

 common insects, is usually overlooked and when noticed is oftimes 

 thought to be fungi or just some dirt particles stuck to the leaf. 



Figure 4Corythucha ciliata, Say; a, erg; b, first instar; c, second instar; d third 



instar (original) 



The Nymphal Stages 



The five stages, or instars, are characterized by several feat- 

 Ufe !!-Jy a11 have in common > though they may be somewhat 

 modified in the various stages. All the nymphs are armed with 

 spines along the margins of the body and head as well as on the 

 back at different points. These spines are of two main types and 

 quite prominent, no doubt functioning as a protection ; this arma- 



