June, 1917] DiCKERSON : LePTOBYRSA RHODODENDRI. 107 



In the Journal of Economic Entomology, Vol. 8, No. 4, pp. 409- 

 414, C. R. Crosby and C. H. Hadley, Jr., give an account of this 

 species, mentioning distribution, food plants, injury, and control 

 measures and describing the eggs and their location, and the various 

 nymphal stages. The various stages of the insect, injury and eggs 

 in position are illustrated. 



As noted in this paper and also by Heidemann this species in- 

 habits the undersides of the leaves and by feeding causes a light 

 mottled spotting on the upper surface. In addition the under surface 

 of the leaves are more or less disfigured with numerous minute dark 

 spots of a dark varnish-like excreted material. 



The egg is somewhat irregular, cylindrical and flask-shaped, or in 

 general outline oval, with a rather broad, neck-like elongation at the 

 outer end turned to one side as shown in the figure. It measures 

 about .4 mm. long and is pale yellowish white. These eggs are 

 inserted in the lower surface of the leaf obliquely toward the midrib 

 with the truncated end of the neck-like portion extending slightly above 

 the surrounding surface (Plate VIII, fig. 6). The egg is capped 

 with a varnish-like material which later becomes dry and hard and 

 sometimes drops off before the egg hatches. This cap has a lighter 

 outer rim and an inner darker portion which is very slightly more 

 protruding. " The tissues surrounding the egg becomes hardened and 

 corky but this hardening is entirely internal and makes no noticeable 

 change on the surface of the leaf." The eggs are usually placed 

 along the midrib and where several of them occur in a row, as is 

 often the case, they are easily seen due to the varnish-like material 

 that covers them. Occasionally they are placed along the side veins 

 a short distance from the midrib and in a few instances I have 

 observed them 5.5 mm. distant from any vein. The number of eggs 

 counted in one badly infested leaf totaled 176, about equally dis- 

 tributed on either side of the midrib, and several other leaves exam- 

 ined appeared to contain fully as many. The number laid by a single 

 female was not ascertained. In ovipositing, the female rests with the 

 body parallel to the surface and with the ovipositor extended from 

 the sheath, extending posteriorly and ventrally into the leaf tissue. 



The various stages of the insect have been previously described, 

 as already noted, and need not be redescribed here. The interesting 

 point is that there are only 4 nymphal instars, the insect thus differ- 



