THE CANADIAN ENTOMOLOGIST 25 



Hololype, ^, Woodworth's Lake, Fulton Co., New York; 

 altitude 1,600 feet; August 13, 1916 (Alexander). 

 Allotype, 9 , with the type. 

 Parak polypes, lOcf 9 . 



Ormosia mesocera, sp. n. 



Related to O. mont-icola O. S. ; antennae shorter and the flagellar 

 segrrents not so greatly attenuated; wings more nearly hyaline. 



Male. — Length 3.7-3.8 mm.; wing 4.4-4.8 mm. 



Rostrum and palpi dark brown. Antennae dark brown; seg- 

 ments only moderately elongated, not greatly attenuated as in 

 vwnticola; each flagellar segment with a slight, apical, narrowed 

 stem that is equal to about one-half the basal swelling; each seg- 

 ment with abundant rather short hairs and verticils. Head dark 

 brown. 



Pronotal scutellum dull, light yellow. Mesonotum reddish 

 with a sparse, gray bloom; thoracic stripes indistinct. Pleura 

 pale brown, very sparsely gray pruinose. Halteres short, the 

 knobs large, pale brown. Legs with the coxae and trochanters pale 

 yellowish brown; femora dark brown, paler basally; tibiae and tarsi 

 brown. Wings pale grayish subhyaline, the costal region and 

 stigma m.ore brownish; veins dark brown. Venation: cell Isl Mi 

 open ; anal veins slightly convergent. 



Abdomen dark brown, the hypopygium a little more reddish. 

 Hypopygium with the pleural appendages short, blunt, slightly 

 curved. 



Habitat.- — Northeastern United States. 



Holotype, (^ , Simmon's Woods, Gloversville, Fulton Co., New 

 York; altitude 900 feet; June 22, 1916 (Alexander). 



Paratopotype, cf. 



Related to O. monticola O. S. (Mon. Dipt. N. Am., pt. 4, pp. 

 145, 146; 1869), but the antennal segments much shorter, the in- 

 dividual segments of the flagellum not greatly attenuated and with 

 the hairs and verticils shorter; no indication of the paler apices to 

 the flagellar segments, and the hypopygial details difi"erent. 



0. monticola is a late summer species, most abundant in 

 August; 0. mesocera appears to be more vernal in its appearance 

 <;n the wing. 



