122 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Gracilaria salicifoliella, Cham. Larva in a blotch mine in upper sur- 

 face of the leaves. 



Gracilaria purpnriella, Cham. Larva rolls the leaves from the tip so 

 as to form a cone. 



Cemiostoma albella, Cham. Larvae in large blackish blotch mines. 



Aspidisca saliciella, Clem. & Cham. Larva in a minute blotch mine, 

 from which it cuts out its pupal case. 



Nepticula fuscotibicvella, Clem. Larva in a linear mine bent back on 

 itself. 



Nepticula. Two unkuown species make narrow, linear, crocked mines, 

 one of which is in the upper and the other in the lower surface of the 

 leaves. 



Marmara salictella, Clem. Larva burrows in young twigs. 



Batrachedra prwangusta, Haw. -j The specific distinctness of 



Batrachedra salicipomonella, Clem. V the insects described under these 



Batrachedra striolata, Zeller. j names seems to me not suffici- 



ently established. B. salicipomonella was bred from galls made by other 

 insects ou Willows. The mode of feeding of the others is not satisfac- 

 torily determined. 



Gelechia salicifunaella, Clem. ) T . „ , , „ 



„ , 7 . ,, . * „ „, > Larvos in galls made by Cymps. 



Gelechia J ungivorella, Clem. \ 



Gelechia, sp.? Imago unknown. The larva sews together Willow 



leaves at great elevations in the llocky Mountains. 



Populus (various species). Poplars, Aspens, Cottonwood. 



Cemiostoma albella, Cham. See under Salix. 



Batrachedra prcmngusta, Haw. i 



Batrachedra salicipomonella, Clem. V See under Salix. 



Batrachedra striolata, Zeller. 3 



Aspidisca sp.? Makes a minute mine in Aspen leaves in Oregon. 

 Possibly it is A. splendori/erella Clem. 



Gracilaria populiella, Cham. Larva rolls Aspen leaves in the Kocky 

 Mountains. 



G. purpuriella, Cham. Larva mines leaves of Silver-leaf Poplar. See 

 under Salix. 



Lithocolletis populiella, Cham. Larva in a tentiform mine in under 

 side of leaves of Silver-leaf Poplar. 



A larva of an unknown Nepticula (?) mines leaves of Cottonwoods in 

 Colorado. 



A larva, possibly not Lepidopterous, mines Cottonwood leaves at the 

 tip in the upper surface in Colorado. 



LILIACE^. 



Yucca (various species?). Soapweed, Spanish Bayonet, Bear's Grass. 

 Pronuba yuccasella, Riley. Larva feeds in the ovary on the seed. 

 Imago found in the flowers. 



