OF WASHINGTON, VOLU.MK XVII, 1915 r 



determined but our observations lead to the belief that the few 

 larvae which are able to feed up during October, make their 

 cocoons before the leaves fall and pass the winter as pupa-. 

 developing into moths curly in spring. 



SYNONOMY. 



Gracilaria strigifinitella, Clemens Proc. Acad. Xat. Sci. Phil., 6, I860. 

 Gracilaria duodecemliniella, Chambers Can. Ent., IV, 11, 1872. 

 Ornix quercifoliella, Chambers Cin. Quart. Jn. Sci., II, 116, 187."). 

 Dialectica strigifinitella, Busck Proc. Ent. Soc. Wash., V, 3, 195, 1903. 

 Acrocercops strigifinitella. Meyrick Gen. Ins. 123 Fasc., 17, 1912. 



EGG. 



The eggs (pi. 1, fig. 3) are laid singly on the under surface of 

 the leaves, usually near the base and between the branching 

 ribs. They average about 0.1 mm. in length, are elliptic in cir- 

 cumference, flattened below and convex above, shining pearly 

 white and minutely faceted. The period of incubation for tho-. 

 specimens under observation was from 4 to 6 days. 



LAKVA. 



Upon emergence from the egg the young larva makes a short 

 irregular linear mine just beneath the cuticle of the leaf on the 

 under side (pi. 2, fig. 4). In this mine it passes the first two 

 instars during both of which it is of the flat specialized gracilariid 

 type (pi. 2, fig. 5), whitish, without legs, abdominal feet or dis- 

 cernible body tubercles or setae. The head-capsule (pi. 3, figs. 

 1, 2) is wedge-shaped with the greatest width just forward of 

 the tentorial bridge; the diameter of occipital foramen at dorsal 

 extremity of hind margin . 1 The frons extends a trifle more 

 than %, the frontal ridges diverging slightly to the juncture of 

 the tentorial arms, and then converging to form a short bridge 

 (ob) with the hind margin which projects into head-capsule -] . 

 The adfrontal sclerites are fused with the frontal ridges. The 

 tentorial bridge is a trifle less than -| in length, straight and 

 thickened somewhat in the middle; the upper attachment of 

 tentorial arms well back of middle of frontal ridges. Ocelli 

 dorsally placed, well back from base of antenna 1 ; strongly bui 

 unevenly pigmented; lenses absent. Antennae 3-jointed, the basal 

 joint short and only seen under oil immersion; the larger papilla 

 on second joint extending nearly to apex of antenna, papilla- 

 otherwise normal; setae absent. Post-labrum approximately tri- 



1 In the description of the head-capsules all measurements are ex- 

 pressed in proportion to the greatest width of the head. 



