Vol. xxiii] ENTOMOLOGICAL NEWS 165 



characteristic tube formed of particles of excrement, and the 

 diverging lines of excrement extending out through the mine. 

 The larva, when full grown, leaves the mine by a circular 

 opening in the lower epidermis and spins among the leaves an 

 ovoid cocoon, very similar to that of C. ostryaeella. The mine 

 of C. purpuriella is perhaps smaller in extent than that of C. 

 ostryaeella and more variable in shape, due to its position and 

 the irregularities in the outline and venation of the oak leaves. 



The imagoes obtained from these mines agree closely with 

 Chambers' descriptions. Apart from the general larger size 

 and darker color, the best character to be used in distinguish- 

 ing C. purpuriella from C. ostryaeella is, as noted by Chambers, 

 the relative position of the central pair of scale tufts. In C. 

 purpuriella these tufts are at approximately the same distance 

 from the base ; in C. ostryaeella the more dorsal of the pair is 

 the farther from the base. 



Apart from the improbability of the breeding of a species 

 of this genus from so small a mine as that noticed by Cham- 

 bers on locust leaves, there is the fact that Chambers' observa- 

 tions rested largely upon conjecture and took no account of 

 the possibility of the accidental introduction of a cocoon al- 

 ready formed upon the locust leaves. In one instance I found 

 a cocoon of C. purpuriella on a blackberry leaf beneath an 

 oak tree. 



I have collected the mines only during the latter part of Sep- 

 tember ; the imagoes appeared the nineteenth of the following 

 June. The species is, however, undoubtedly double brooded as 

 the cocoon found on blackberry was collected on the 22d of 

 July, the imago appearing on the 29th. 



Opostega albogalleriella Clemens. 



Opostega albogalleriella Clemens, Proc. Ent. Soc. Phil., I, 131, 1862; 

 Tin. No Am., 180, 1872; Busck, Proc. Ent. Soc. Wash., V, 208, 1903; 

 Dyar, List N. A. Lap., No. 6228, 1902. 



Syn. quadristrigella Chambers, Cin. Quart. Jn. Sci., II, 106, 1875 ; 

 Busck, Proc. Ent. Soc. Wash., V. 208, 1903; Proc. U. S. N. M., XXX, 

 731. 1906; accessoriella Frey and Boll, Stett. Ent. Zeit., XXXVII, 216, 

 1876; Busck, Proc. Ent. Soc. Wash., V, 208, 1903; nonstrigella Cham- 

 bers, Jn. Cin. Soc. Nat. Hist., Ill, 296, 1880; Busck, Proc. Ent. Soc. 

 Wash., V, 208, 1903. 



