50 



black, yellow basally, head fuscous, whitish on orbits and margins 

 of eyes below and behind. Fuscous markings of wings not so 

 clearly limited as in johnsoni. Bases of hind tibiae brown. 

 Hypopygial claspers as in johnsoni. 



Length, 4 mm. 



Type, Glen Echo, Maryland, August 22, 1922 (J. R. Malloch). 



Four females before me differ from the above male as stated in 

 the key and also in having the dorsum of thorax including the 

 lateral margins black, third antennal segment less broadly black- 

 ened, face paler, and wings more conspicuously blackened; hind 

 tibiae largely brown. It is possible that this is not nigripalpis, 

 but there is sexual dimorphism in many species of the family so 

 that it may be the female of this species or of apiculata. 



Localities, Bar Harbor, Maine, June 17, 1922; Mt. Desert, 

 Maine, June 10, 1921; Bashbish Falls, Massachusetts, June 27, 

 1912; Milford, New Hampshire, June 23 (C. W. Johnson). 



Glusiodes (Columbiella) orbitalis, sp. n. 



Female. — Head yellow, frons darker, occiput blackish above, 

 antennae and palpi yellow, arista brown. Thorax brownish yellow, 

 anterior margin of disc, two submedian vittae, disc of scutellum, 

 and a line along upper margin of pleura blackish, lateral margins 

 of mesonotum whitish. Abdomen black. Legs yellow, apices of 

 fore and hind tibiae and entire fore tarsi infuscated. Wings as 

 stated in key. 



The fore femora have the ventral setulae longer and the series 

 is more extensive than in the female above described. 



Length, 4 mm. 



Type, Bar Harbor, Maine, June 13, 1921 (C. W. Johnson). 



Heteromeringia convergent, sp. n. 



Male and female. — Entirely yellow, the face whitish, and the 

 apices of wings very slightly clouded. Bristles yellow. 



Differs from flaviseta Johnson and its allies in having the frons 

 very much narrowed above, the others having it either parallel- 

 sided or but slightly narrowed. The male hypopygial claspers 

 are slightly tapered apically and a little longer than wide. 



Length, 3.5 to 4 mm. 



Type, male, Urbana, Illinois, July 13, 1916 (J. R. Malloch). 

 Allotype, Lafayette, Indiana, July 27 (J. M. Aldrich). Paratypes, 

 one male, Chain Bridge, Virginia, August 20, 1922 (J. R. Malloch); 

 one female, Atherton, Missouri, July 2, 1922 (C. F. Adams); and 

 a large series in the collection of Illinois Natural History Survey, 

 standing as flaviseta, which I used as the basis of my work already 

 referred to but erroneously described the immature stages as those 

 of flaviseta. Missouri specimen in collection of Boston Society 

 of Natural History. 



