90 AMERICAN DIPTERA. 



7. Blackish sjiots of different sizes in all the cells of the wing (Mexico). 



|>oIy!<if igiiia YauderWulp. 

 A ronnded dot between the second and third veins (Mexico). 



diMtigniii Van der Wulp. 

 A black spot on each side of the ocellar si)ot (Mexico)- • • iiiioiis Giglio-Tos. 

 Without the above characters 8. 



8. Wiujjs entirely hyaline zetter!!ite<lti Loew. 



The transverse veins and apices of longitudinals distinctly infuscated 9. 



9. Scutellum except the sides bare apicalis Loew. 



Scutelluni pilose barberi n. sp. 



Heloiuyza loiigipeiiuis Loew. 



Length 8.1 mm.; of wing, the same. 



Large, rather pale yellow to reddish-yellow species, marked with a blackish 

 triangle on each of abdominal segments two to five; this triangle as wide as the 

 segment and occupying all its posterior part, the apex of the triangle pointing 

 cephalad and indistinctly approaching the next preceding segment. 



Head bright yellow, front wide, with one fron to-orbital on each side; antenna- 

 short, the third joint a little elongated ; arista with short but dense plumosity ; 

 face and cheeks pale yellow ; vibri.ssse small ; cheeks hardly half as high as the eye. 



Dorsum of thorax testaceous, not dotted ; scutellum flat, pilose above; meso- 

 pleura bare ; sternopleui'a with one strong bristle, and a few delicate yellow hairs, 

 the lower part with longer mostly yellow hairs. 



Abdomen lighter yellow, marked with black as indicated above; hypopygium 

 small, yellow; venter in the male with long yellow hair. 



Legs yellow, femora in the male stout, all with a row of spines on the outer 

 side, and abundant, long yellow hair on the lower part; last two joints of the 

 tarsus black. 



Wings yellowish, large and broad, the cross-veins ami tips of longitudinals 

 with only a trace of infuscation. strongest on the hind cross-vein. 



Three males and one female. Johnson: St. Johnsbury, Vermont, 

 June 27th; Delaware Water Gap, New Jersey, July 11th; North 

 Mountain, Pennsylvania, August 28th. Daecke : Bloomjfield, New 

 Jersey, September (Weidt). 



The type locality was New York, and the species had been 

 reported from New Jersey by Johnson in Smith's Catalogue. 



lleloniyza pliiniafa Loew. 



Length 4.6-5.2 mm. ; of wing 5.9 mm. 



General color pale yellow ; legs somewhat lighter colored ; five brown spots on 

 the wing. 



Head yellow; eyes medium sized, roundish; front saffron-yellow, lower part 

 densely pubescent; antennas same color or slightly darker, third joint oval; 

 arista rather long, plumose; cheeks about half as wide as the eyes, paler than 

 the front; vibrissse rather small. 



Dorsum of thorax saffron-yellow; besides the ordinary bristles it is densely 

 pubescent all over, the small hairs arising from small brown dots; humeri 

 lighter in color; mesopleura pale yellow, entirely bare; sternopleura pale yellow, 

 with several small hairs besides the one strong bristle; scutellum thinly hairy 

 and with the usual four bristles. 



