Vol. 35, pp. 141-144 October 17, 1922 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



SEVEN NEW SPECIES OF THE SYRPHID GENUS 

 SPHEGINA MEIGEN (DIPTERA). 



BY J. R. MALLOCH. 



There are at the present time seven species of this genus 

 recorded from the United States. In this paper there are inchi- 

 ded descriptions of seven new species the types of all of which 

 are deposited in the United States National Museum. 



Sphegina flavomaculata, sp. n. 



Male. — Shining black, with faint grayish pruinescence. Antennae 

 brownish yellow. Thorax indistinctly trivittate, the median vitta divided 

 anteriorly. Abdomen with a large elongate yellow mark in center of first 

 (second) tergite, and the second and third tergites yellow except posteriorly. 

 Legs colored as in armatipes. 



Arista thickened on basal two thirds, very little longer than antenna, 

 with very short pubescence. First tergite broad, narrowed basally, not 

 longer than the next two combined. Fifth sternite with very short pale 

 hairs which are almost uniformly distributed on the entire surface ; hypopy- 

 gium with short hairs. Hind femur not as thick as first tergite; spur of 

 hind tibia curved, acute; basal segment of hind tarsus shorter and stouter 

 than in next species. 



Length, 5 mm. 



Type— Gresit Falls, Va., April 20, 1916 (W. L. McAtee). 



Sphegina armatipes, sp. n. 



Male. — Black, shining, with faint gray pruinescence. Facial prominence 

 slightly yellowish, antennae brown; palpi yellow, infuscated at apices. 

 Base of second tergite broadly yellow, venter largely yellowish. Apical 

 two segments of fore and mid tarsi and all of hind pairs fuscous; hind 

 femora except base, and apices and bases of hind tibiae blackened. Wings 

 slightly infuscated apically. 



Frons about twice as long as wide, with very short hairs; arista gradually 



tapered from base, densely pubescent, longer than antenna. Scutellum 



rounded, with two long hairs. First tergite as long as the next two combined, 



widened from base to apex; fifth sternite with a large patch in center pos- 



32— Proc. Biol. Soc. Wash., Vol. 35, 1922. (141) 



