410 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxv. 



frass pushed out through a hole below. The larvje readily emerge 

 from the mine and start a new one in another leaf, entering by a slit 

 which they make on the underside. The mature mine is a large, lobed 

 hollow under the upper epidermis. The ,young mines are long and 

 toruotus, on the under side, not widening. Found at Baileys in the 

 Platte Can3'on July 13. First imago July 25, 



LEUCOPTERA ALBELLA Chambers. 



Larva. — Head flat, rounded, a band-shaped cl3'peus, narrowed a little 

 above; whitish, two black ocelli visible on the upper aspect, three on 

 the lower; mouth small pointed, the brown mandibles small, normal. 

 Body slender, flattened, laterally moniliform; joints 2 and 3 larger 

 than 1 and 5, 6 to 10 again a little larger, subequal, 11-12 and 13 

 tapering, 13 divided, but the segments of equal width. Cervical shield 

 present as a slightly wrinkly area but perfectly concolorous, Avhitish. 

 Male glands large, flUing the whole dorsum of joints 9 and 10, yellowish 

 faintly, segmented. Thoracic feet very short, appressed, projected 

 laterally but not exceeding the edge of the body. Abdominal feet 

 sessile on joints 7 to 10, those on joint 13 a little larger. Venter of 

 joint 2 subcornifled, the feet almost rudimentary. White, no marks, 

 no visible seta?. 



Leaf miners in the narrow-leav^ed cottonwood at Morrison and on the 

 foothills back of Golden. A large, black, blotch mine under the upper 

 epidermis, eaten through continuously to the lower epidermis, making 

 a large dead area in the leaf. Several larvfe in each mine, feeding 

 side by side. Frass contained. The larvae were very abundant where 

 they occurred, nearly destroying all the leaves on large trees, though 

 the individual larva is so minute. When they spun, the remaining 

 leaves of the tree and adjoining foliage were spotted with their white 

 cocoons, covered over by cross bands of silk. First found June 28, 

 by Mr. Caudell. 



LITHARIAPTERYX ABRONIiEELLA Chambers. 



Larva. — Head small, the apex in joint 2, rounded, clvpeus trian- 

 gular, touching the vertical triangle; sordid luteus, mouth brown, 

 sutures of clypeus brownish, ocelli black; labium large. Cervical 

 shield brown, bisected into two triangles, the edge dotted by black 

 tubercles. Body slender, cylindrical, segments submoniliform and 

 almost equal, slightly tapering at the ends. Not shining, rather 

 opaque pale green; tubercles small, l)lack; ia+ib, iia+iib, iv+v on 

 thorax; on abdomen, i dorsad to ii, iv and \ remote, iv percoptibl}^ 

 dorsad, vi normal. Segments biauuulate, the subventral fold rounded, 

 prominent. No marks. 



The pupa is flattened, resembling a seed with a wing-like margin. 

 It is green at first, but soon turns brown. The larvie form variously 



