Dec, 1919-] Felt: New Gall Midges from the Adirondacks. 277 



Tegmina reddish-brown, opaque, coriaceous and punctate except for a large 

 triangular area near the apex at the costal margin which is entirely clear; this 

 triangle rests with its base on the coastal margin of the wing and its apex di- 

 rected upward, it extends halfway to the tip of the posterior process above and 

 extends from near the apical end of the wing for more than one third the dis- 

 tance toward the base ; the veins in the reddish opaque part of the tegmen are 

 prominent and black, those in the hyaline triangle are pale and yellowish. 



Thorax and undersurface of the body very dark brown or black, legs black, 

 all of the tibiae foliaceous, tarsi ferruginous. 



Length from front of head to tip of tegmina, 6.8 mm. ; length from apex 

 of pronotal horn to tips of tegmina, 9 mm. ; length of pronotal horn measuring 

 from humeral angles, 4 mm. ; width of pronotum between humeral ang'es, 

 1.8 mm. 



Type : male. Locality : Sao Paulo, Brazil. 



This very interesting and grotesque insect resembles L. gaff a Fair- 

 maire in the shape and position of the pronotal process, but is quite 

 distinct from that species in the structure of the posterior process. 

 L. triangulata should be recognized by the hyaline triangle on the 

 tegmina and the straight posterior process. 



NEW GALL MIDGES OR ITONIDIOSE FROM THE 

 ADIRONDACKS. 



By E. P. Felt, 

 Albany, N. Y. 



The species described below were from a fine lot of 648 pinned 

 specimens collected in August and early September, 1917, and gener- 

 ously donated to the New York State Museum by Mr. Howard Not- 

 man of Keene Valley and Brooklyn, with the one exception of Porri- 

 condyla johnsoni, a species characterized in connection with the 

 study of this collection. 



An exceptionally large number of non-gall-making forms will be 

 noted, a condition very likely to occur in general collections from 

 heavily wooded areas where an abundance of moist, decaying vege- 

 table debris favors representatives of the more generalized groups. 



The midges were collected in nature much as are larger flies and 

 there is really no reason why these minute forms should not be cap- 



