21 



house where there were thousands of young plants with but 

 few blossom buds, if they were driven from one of these they 

 would fly but a few inches away and soon return. They are 

 exceedingly minute, and obscure while on the wing, having 

 much the appearance of floating particles of dust. 



While the larvae are at first usually well covered by the, 

 sepals and folded leaves, if excessively abundant they will, later 

 swarm out and over the outer surface, especially of the blossom 

 buds, finally leaving them in the condition indicated in the plate. 



DESCRIPTION. 



Egg (PL III., b).^Length, 0.32 mm.; width, 0.075 mm. 

 Smooth, orange color with tinge of yellow, elongated ovoid, 

 with one end but slightly obtuse. 



When placed under the sepals, the eggs are often slightly 

 bent or otherwise distorted, but when deposited on the surface 

 or in the folded leaves, this does not occur. They have a vague 

 resemblance to the hair-glands of the buds, and might be mis- 

 taken for these by the careless observer. The egg period is 

 two days. 



Larva (PL III., c, d). — The newly hatched larva is but 

 little larger than the egg from which it emerged, and much the 

 same color. Later it becomes nearly white, but when ap- 

 proaching maturity it takes on a reddish tinge, without definite 

 pattern in its coloration, except that the lateral margins remain 

 white. The amount of color varies with individuals, but none 

 are wholly orange. The length of afully grown larva is 1.8 mm.; 

 width, 0.45 mm.; widest at middle, obtuse and tuberculated on 

 the posterior segment, tubercles with minute apical spine, sur- 

 face finely granulated, lateral margins distinctly compressed, at- 

 tenuated anteriorly, breast-bone distinct, a conspicuous black 

 spot on upper side and showing through to the under side in- 

 distinctly, just in front of breast-bone. Antennae short, not 

 extending beyond the body. 



When fully grown the larvae crawl out and drop to the 

 ground, and I have observed as many as twenty-five in a single 



