ART. 9 AMEEICAN XYLOTINE SYRPHID-FI.IES SHANNON 37 



pubescent; hind trochanter of male with spur; abdomen elongate, 

 fourth tergite longer than broad ; male with a pair of oblong yellow 

 spots on second tergite, female with second tergite dark, sometimes 

 with a trace of the yellow spots; discal cross vein joining discal cell 

 beyond its middle; metathoracic spiracle fairly large, but smaller 

 ihan third antennal joint. 



Occasional males have the yellow spots almost obscured. 



Distribution. — A fairly common species in eastern North America, 

 not recorded south of North Carolina. Has been recorded from 

 Nebraska (Hunter, Jones). 



Type. — In Cambridge Museum Comparative Zoology. 



XYLOTA BICOLOR Loew 



This species and -fiavitihia have the same abdominal coloration, 

 chiefly reddish orange. There would be no difficulty determining 

 these species from the other Xylotae except that the fourth tergite 

 is sometimes obscured by dark, diffuse markings, in which case they 

 may be confused with segnis and notha. Unfortunately, no better 

 character than color seems available for separating these two from 

 the other Xylotae, but on the whole the coloration is sufficiently 

 characteristic so that there should be little difficulty in identifying 

 them. 



Large, fairly robust species, about 13 mm. Antenna large, notice- 

 ably longer than width of front of female, black; arista yellowish, 

 darkened on outer half, longer than width of face; anterior basi- 

 tarsus of male without long hair or black spines on ventral side; 

 metasternum pubescent; hind trochanter of male without spur; 

 abdomen, except first tergite, reddish orange; male genitalia entirely 

 reddish orange, styles but little longer than broad; discal cross vein 

 joining discal cell at middle; metathoracic spiracle distinctly smaller 

 than third antennal joint. Metcalf has figured the male genitalia 

 and Greene has figured the puparium. 



DistHhution. — A fairly common species east of the Mississippi. 

 Not reported south of North Carolina. Recorded from Colorado 

 (Jones), prbably a misidentification for -fiavitihia Bigot. 



Type. — In Museum of Comparative Zoology. 



XYLOTA FLAVITIBIA Bigot 



A rather large, robust species, about 12 mm. 



Antennae black, rather small, in female distinctly shorter than 

 width of front at middle, third joint rounded; arista black, a little 

 shorter than width of face; anterior basitarsus of male with long 

 hair and ventral spines; metasternum pubescent; hind trochanter of 

 male with spur ; abdomen reddish orange beyond first tergite, some- 

 times marked w^ith diffuse dark spots; discal cross vein joining discal 



