OF WASHINGTON. 107 



The eggs are laid late in the fall, very differently from those 

 of all the other tingitid species with which I am acquainted. 

 Instead of being fastened on the surface of the leaves, un- 

 protected, as are those of the species living on oak, or being 

 hidden beneath the pubescence of the leaf like those of the 

 sycamore species, they are inserted entirely into the epider- 

 mis of the leaves, mostly at the sides of the main rib. In this 

 enclosure the eggs are protected during winter, and the 

 leaves of the laurel do not wither and fall off in this region 

 before the middle of June. Late in March, or in the earlier 

 part of April when the embryo insect in the egg begins to 

 grow, there appear on the underside of the leaf, right on 

 the midrib, some brownish spots. Later these spots show 

 little cracks, and thereby the tip of the egg is exposed; soon 

 the lid of the egg, which is somewhat oval in shape, is thrust 

 open and the young larva emerges from its confinement. The 

 egg is of a cylindrical-oval form, yellowish-white in color, and 

 about 0.4 mm. long. 



The young brood and some unhatched eggs were found on 

 leaves of Kalmia latifolia in the woods near Brightwood, D. C., 

 April 20, 1903. Some of the infested leaves of mountain 

 laurel were taken home and placed in glass jars so that the 

 hatching of the eggs and the development of the larval forms 

 might be studied. After three days some of the eggs opened 

 and the young larvae appeared; they are of a whitish color, 

 somewhat transparent at first, and without spines. After 

 taking plenty of nutrition the color turns into a greenish white ; 

 the body is more elongate, and the head comparatively very 

 large ; the antennae are long, nearly reaching end of abdomen, 

 thick, and beset with fine hairs. 



Four days later the young nymphs shed their skins and 

 entered into the second stage of development. This time the 

 color darkens on the thorax and middle of abdomen ; the form 

 of the body has changed and become broader; the eyes are 

 large, showing five red facets ; at sides of each abdominal 

 segment small processes protrude, also a few prominent ones 

 on the first, third, fourth, and sixth segments at middle of 

 abdomen dorsally; others, still more prominent and stouter, 

 on the pronotum and mesonotum and five on the head, those 

 at base of head largest and bent forward; in this stage the 

 antennas and head appear smaller and less stout than in the 

 former stage. 



The larvae began shedding the skin again on the 3d of 

 May, but any further observations on the other stages of de- 

 velopment came to a sudden stop; the insects died or dis- 



