30 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



in calling attention to certain facts concerning the species of a 

 geographically restricted group. For the study of the Graci- 

 lariidae along broader lines Meyrick's comprehensive work must 

 be consulted. 



The careful study of wing venation requires the complete 

 denudation of the wings and it is therefore evident that unique 

 types could not always be satisfactorily examined. In the fol- 

 lowing article all such exceptional cases will be noted. 



The general characters of the Gracilariidae, so far as the vena- 

 tion is concerned, are given by Meyrick as follows: "Forewings 

 lanceolate or very narrowly elongate; 1 b simple, cell long, two- 

 thirds to three-fourths of wing, 2 from toward lower angle, 4 usu- 

 ally from angle, 7 to costa, 8 usually separate or absent, 11 from 

 about one-third of cell or near base or absent, upper margin of 

 cell usually obsolete on basal third. Hindwings one-half to two- 

 thirds, lanceolate or linear cilia 2-8; 1 c absent, cell open between 

 4 and 5, 5 and 6 often stalked, 6 and 7 approximated anteriorly 

 or seldom stalked." 



This characterization holds good of all North American species, 

 so far as observed, which are now listed in this family. I would 

 add that, with the list of species now under consideration, 1 a is 

 usually absent and 1 c weak, when present, in the forewings, and 

 that, in the hindwing, 6 is invariably stalked with 5 when both 

 are present. In regard to the anal veins it would appear that 

 1 b, which so often preserves the fork at the base, in other fami- 

 lies, should be the strongest vein and the last to disappear. There 

 seems to be a general tendency to eliminate both 1 a and 1 c, 

 with 1 c the more persistent of the two. In the hindwings it is 

 usually difficult to discern any anal vein whatever. 



Metriochroa Busck 1 shows 6 stalked with 7 in the hindwing, 

 but with a complete separation between 5 and 6, and for these 

 reasons is not included in this paper. It is said by Meyrick to 

 be allied to Tischeria. I am informed by Mr. Busck that there 

 is some probability that the larva of another insect was de- 

 scribed under this genus, as the collected material shows but one 

 larva answering the published description, and two others which 

 are typical gracilariid larvae, according to Heinrich. 



Eucosmophora Walsingham is also not included in this paper. 

 Meyrick states that Walsingham's description of the reduced 

 neufation was incorrect and places this genus under Acroccrcopx. 

 He does not however give a description of the true neuration, 

 which is unknown to me. The species sideroxylonella Busck is 

 therefore listed provisionally under Acrocercops. 



1 Busck, Proc. U. S. Nat. Mus., Vol. XXIII, p. 2i:>, 1900. 



