190 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



with four j^niyishyellowisli stripes; the middle pair not very broad, 

 gi^adually dilated on the hind i)art, the median black stripe has in the 

 middle a very slender grayish i)o]linose stripe, obsolete in front and be- 

 hind. Scutellum yellow, narrowly black at the base and on the sides. 

 Abdomen : First segment pollinose, except a black spot on each side-,- 

 second segment with a broad, widely interrupted, yellowish-red cross- 

 band, the posterior margin narrowly shining, in the middle with a yel 

 lowish spot; third segment similar, the cross-band very narrowly inter- 

 rupted, with a moderately broad, biarcuate, opaque black cross-band 

 behind the yellow, i)osterior margin of the segment narrowly yellow, 

 broadly and angularly dilated in the middle and yellowish pollinose; 

 on the fourth segment the yellow band is less wide, entire, touching the 

 front margin on the whole length, narrowed in the middle, behind it 

 an entire black cross-baud, the sides of which are oblique; posterior 

 margin more broadly yellow, behind the black an eiitire pollinose cross- 

 baud, narrow at the sides, broad in the middle; fifth segment wholly 

 ])ollinose, the margins yellow. Legs reddish-yellow ; base of front and 

 middle femora, an incomplete median ring on the hind femora, tip of 

 froQt tibiae on the inner side, end of hind tibise and an incomplete sub- 

 basal ring, and the hind tarsi, black or blackish. Wings nearly hyaline. 



(? . Face and lower part of front brighter yellow ; front above, between 

 the parallel orbits, black, lightly pollinose, with black pile, below on 

 the yellow part the pile is yellow. Stripes of grayish pollen on the 

 dorsum of the thorax narrowed, almost linear, the slender line in the 

 middle of the median black stripe almost indistinguishable. Pile of 

 thorax moderately long, yellow, across the disk of the scutellum some- 

 what intermixed with black. Abdomen : first and second segments as 

 in the female, except that the yellow cross-band is broader and a little 

 less widely interrupted; third segment with two large yellow sjwts, nar- 

 rowly separated at the tips, leaving a slender, biarcuate cross- band of 

 opaque black behind, narrower than in the female, connecting at their 

 inner ends with the triangular or semi-oval spot in front, which is less 

 transverse than in the female; the fourth segment wholly grayish j)olli- 

 nose, except a very slender, biarcuate black cross-band, connecting in 

 the middle with a small spot in front, hind margin yellow ; hypopy- 

 gium black, wholly pollinose. Front ^nd middle femora more broadly 

 black at their base; hind femora black, except narrowly at the base, 

 and a broad, preaj)ical ring. 



A single male specimen from Saratoga, N. Y., August 30, on meadow 

 land, and a female from New Haven, which undoubtedly belongs to the 

 same species, although the black of the femora is diiferent in extent, 

 and which in the male does not agree so well with Loew's description. 



Helophilus chrysostomus. (PLate VIII, fig. 5.) 



Eristtxiis chriiHOSlnmun Wiedemann, Aus^. Zw. Ins., ii, 174, 30. 

 Helophilus chriisostomiis Osten Sacken, Cat. Dipt., 133. 



Habitat. — Xew Fngland, New York!, Georgia (Wied). 



