OF WASHINGTON, VOLUME XV, 1913 103 



larger white, not yellow, cheeks, by the black, not yellow, collar 

 and by the absence of yellow on the second joint of the abdomen. 



Ectoedemia castaneae, new species. 



Palpi and lower face ochreous. Upper face and head black. Antennae 

 blackish brown with narrow yellow annulations and with large milk-white 

 eyecaps contrasting strongly with the dark tufted head. Thorax blackish 

 brown sprinkled with ochreous scales, especially posteriorly; posterior tip 

 ochreous. Forewings blackish brown liberally sprinkled with bluish white 

 scales. Cilia fuscous. Hindwing dark fuscous, blackish along the costa 

 with lighter ochreous fuscous cilia; in the males with a strong yellowish 

 costal hair tuft. Abdomen dark fuscous with ochreous anal tuft and 

 ochreous underside. Legs light silvery ochreous. Alar expanse: 7.5-8 mm. 



Habitat: Vietch, Virginia. 



Type: U. S. Nat. Mus. No. 16333. 



The life history of this species has recently been ascertained 

 by Dr. A. D. Hopkins and Mr. T. E. Snyder, who have bred 

 it from small galls on young twigs of chestnut, reminding one in 

 form and size of the egg masses of the forest tent-caterpillar. 



The larva resembles that of Nepticula; the head is small, nor- 

 mal, retractive into the first thoracic segment which lacks all 

 trace of feet; the other thoracic feet and all the abdominal feet 

 are represented by rudimentary processes; such are found on 

 joints 3 and 4, 6, 7, 8, 9, 10, and on joint 13 while they are faintly 

 indicated on joint 5; thus joints 11 and 12 are the only ones beside 

 2 which have no trace of feet. In Nepticula the formula is 

 " . .2.6. . ". 



The species is close to E. obrutella Zeller, which species must 

 be included in the present genus, but differs in the darker thorax 

 and forewings. Obrutella was described in the genus Trifurcula 1 

 but shows some important difference in pterogostic characters 

 from the type of this genus, T. pallidella, of Europe (fig. Ib). 



The life history of Trifurcula is not known. 



The leaf mining genus Nepticula 2 (fig. Ic), typically shows a 

 reduction of the venation by the absence of vein 8 and of the 

 cubital veins; in some of the larger blotch-making species of the 

 genus however, these veins are present or at least indicated and 

 the venation is practically that of the gall-making Ectoedemia. 



1 Verh. Zoo-bot. Gesell. Wicn. XXIII, p. 316, 1873. 



2 1 use the geonym Nepticula advised!}^ instead of Stigmella Schrank, 

 as adopted by Lord Walsingharn and Mr. Durrant. The earlier name, 

 Stigmella, is a nomen nudum, whether by accident, as held by Lord \Val- 

 singham or not, and is for that reason in my opinion not available as a 

 substitute for Nepticula Zeller. 



