150 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



ninth abdominal segments while the rest of the insect developed nor- 

 mally, is not without interest. This abnormality is readilj- noted 

 as the sheath (which is composed of the gonapophyses, which are 

 appendages of the eighth and ninth ventral segments) is so reduced 

 that it cannot be seen without magnification of thirty-five diam- 

 eters. 



TENTHREDELLA SPECIES (PROBABLY VERTICALIS Say) MALE. 



At Glencarlyn, Virginia, on June 9, 1911, a male of this species 

 was collected, in which the lateral ocelli are entirely wanting. This 

 causes the vertex to be depressed. Along with this abnormality 

 of the head goes a slightly different type of coloration and a narrow- 

 ing of the facial quadrangle, so it is impossible to accurately de- 

 termine this male. The obliteration of the ocelli is the first record 

 of the kind known to me. 



In this connection, for completeness' sake, it may be well to call 

 attention to the abnormally developed propodium in Oryssits 

 abietes Rohwer, which is described on page 154, Proc. U. S. Nat. 

 Mus., vol. 43, September, 1912. 



NOTE ON A BARKMINING LEPIDOPTERON OF THE G?ENUS 



MARMARA CLEMENS. 



BY AUGUST BUSCK, Bureau of Entomology. 



In the course of the work on forest Lepidoptera at Falls Church, 

 Virginia, we have lately bred several specimens of Marmara fnl- 

 gidella Clemens, from oak; it is gratifying to find that the biology 

 of the species definitely confirms the generic determination made 

 by Mr. Chas. Ely and myself a year ago, when we transferred the 

 species from the genus Gracilaria to Marmara, solely on pterogos- 

 tic characters. 



The larva is of the identical flat, deeply segmented form as that 

 of Marmara salictella Clms., the type of the genus. It forms long 

 winding galleries just under the epidermis of young trunks and 

 branches of oak, similar to those of M. salictella Clms. on willow, 

 and leaves the mine in early spring, April, to spin a small cocoon 

 in some convenient crack in the bark. The cocoon is ornamented 

 by similar globular air-bubbles, voided by the larva through the 

 anal opening as is characteristic of the other species of this genus. 

 Imago issued in May. 



Similar Marmara mines were found less commonly on chestnut, 

 but unfortunately the imago were not secured this year ; this may 

 prove the same species or one of the allied forms, fasciella Chmb., 

 or eloteUa Busck, as yet listed under the genus Gracilaria. 



