SYNOPSIS OF NORTH AMERICAN SYRPHID^. 93 



first segmeut with a small yellow spot on each side, jnst under the hal- 

 tercs ; second segmeut with an oval spot on each side, not reaching the 

 lateral margin, somewhat attenuated toward the inner end; third and 

 fourth with large rectangular spots separated by nearly their own 

 width, and not quite reaching the lateral margin; fifth with an anterior 

 fascia, narrower in the middle, and encroaching slightly upon the pre- 

 ceding segment. Legs yellow, anterior and middle femora sometimes 

 narrowly brown annulate near the base; posterior legs mostly brownish 

 or blackish, except the base of femora, and broadly on the knees. 

 Wings hyaline with a slight smoky tinge; stigma yellowish. 



Eight specimens, Washington Territory, and a single female from the 

 White Mountains, New Hampshire, July !i5. 



This species is very closely related to X.feJix^ and 1 am not at all 

 sure but that it may be the same. The broadly interrupted bands of 

 the abdomen, however, seem to indicate a s})ecific difference. The ab 

 domen in all my specimens is broadest at the tip of the third segment ; 

 in tny single specimen of X.felix it attains its full width at the end of 

 the second. 



Xauthc gramma emarginata. 



Scava cmunjinata Say, J. Acad. Phil., iii, 91, 5; Comiil. Wr., ii, 79. 



Syrphuft emarfjinatus Wiedemanu, Auss. Zw. Ins., ii, 119,4. 



^Jllograpta emarciinata Osten Sacken, Cat. Dipt., 1'2G. (The query is Osten 



Sacken's.) 



Habitat. — Florida, Pennsylvania, New Hampshire! 



5,9. Length, 10 to 11™™. Face wholly yellow (or reddish-yellow). 

 Antenna? reddish ; the third joint near the base and on upper part 

 blackish. Frontal triangle, just above the antennae, with two blackish 

 spots, connected by a brownish arcuated band ; elsewhere the triangle 

 is yellowish pollinose. Front in female shining metallic green : on the 

 sides, from a little below the ocelli, yellow like the face, and yellow pol- 

 jinose; pile black. Thorax shining bronze-green, with a rather broad, 

 not conspicuous yellow stripe on each side; an ill defined yellow spot on 

 the pleurte. Scutellum translucent yellow, with black and yellow jjile. 

 Abdomen opaque black; first segment shining, yellow on the sides, 

 near the halteres ; second segment with the extreme front angles yel- 

 low, and two large, oval si)ots, narrowly separated, and only a little 

 attenuated before the lateral margins, which they touch ; third segment 

 narrowly yellow at the anterior angles, and near the middle with a 

 broad yellow cross-band, not attenuated at the sides, separated from 

 the lateral margins, or the anterior angles only, nearly touching,.behind 

 in the middle with a broad, angular emarginatiou, reaching about half 

 way through the band ; posterior edge of the third segment also nar- 

 rowly yellow, but not reaching the sides, forming with the yellow mar- 

 gin of the next segment a narrow, gently arcuate band ; fourth seg- 

 ment with'a similar median cross-band, but the posterior emargination 

 deeper, and more acute, nearly cutting the band in two (in some speci- 



