146 INSDCUTOR INSCITI^ MENSTRUUS 



stigmal region conspicuously darker ; veins stout. Venation : r 

 inserted on R.^ at about its own length beyond the fork of 

 i^2"'"3/ petiole of cell Mo subequal to or about one-half longer 

 than the basal deflection of Cu^, which is inserted immediately 

 before the fork of M ; anal veins divergent, the second anal 

 vein just before its tip bent slightly toward the first. The 

 holotype has an adventitious crossvein in cell R.^ of the left 

 wing. 



Abdomen dark brown, the hypopygium brighter colored, es- 

 pecially beneath. Male hypopygium with the pleurites rather 

 stout. Outer pleural appendage a small, flattened, black lobe 

 whose outer face is minutely roughened, at the base on the 

 inner margin with an obtuse lobe ; inner pleural appendage a 

 little longer, yellowish, the apex obtuse, before the tip with a 

 small, slender, cylindrical projection. Penis-guard elongate, 

 slightly sinuous, projecting conspicuously beyond the genital 

 chamber. Gonapophyses slender, acute, curved slightly proxi- 

 mad. Eighth sternite with a conspicuous flattened median 

 lobe as in the meigenii group. 



Habitat. — New York (Fulton County, Southern Adiron- 

 dack Mountains). 



Holotype, S , Simmons Woods, Gloversville, altitude 900 

 feet, June 23, 1916 (C. P. Alexander). 



Paratypes, Woodworths Lake, $ , June 17, 1916 ; $ , July 7, 

 1916; Mountain Lake, 3 $ 's, in balsam, June 17, 1914. 



Type in the collection of the author. 



O. adirondacensis is closest to 0. bilineata Dtz. but is easily 

 separated by the coloration, the course of the second anal vein 

 and, especially, the structure of the male hypopygium. 



Ormosia stylifer, new species. 



General coloration light yellow, the mesonotal praescutum 

 without darker markings ; wings nearly hyaline, the costal cells 

 yellowish, the stigma indistinct ; outer deflection of M., lacking, 

 cell ist M.^ being open ; anal veins divergent ; gonapophyses of 

 the male hypopygium elongate, stylet-like ; eighth sternite 

 greatly produced, deeply notched medially. 



Male. — Length about 3.3-3.5 mm. ; wing, 4.7-5.2 mm. 



