SYNOPSIS OF NORTH AMERICAN SYRPHID^. 139 



Volucella eugenia, n. sp. (Plate YI, tig. 10.) 



Habitat. — Bahamas, Florida ! 



9 . Length, 14""™. Front and face light yellow, clothed with light 

 yellow pile; cheeks deep shining black. Face considerably excavated 

 below the antennae, and with a rather large protuberance near the mid- 

 dle, much produced directly downward to a very acute tip. Antennae 

 yellow, third joint a little broadened at the distal end, much excised on 

 its upper border near the middle; arista a little longer than the joint, 

 moderately pilose. Eyes pilose. Dorsum of thorax olive-greenish- 

 black, somewhat chestnut or even yellowish on the sides ; clothed with 

 short, rather sparse, pile, intermingled with yellowish on the humeri; 

 along the dorso-pleural suture with short bristles, longer and more 

 abundant on the post-alar callosities. Scutellum black at the base, be- 

 coming reddish on its border, yellowish below ; along the border there 

 is a row of black bristles. Abdomen brilliant violet, clothed with abun- 

 dant, short black pile. Legs black; all the tibise, except the terminal 

 fourth or third on the hind x)air, yellowish red. Wings hyaline, cross- 

 veins narrowly clouded with brown, the auxiliary vein and nearly all 

 the first, the second, third, and fourth to near the cross-veins, conspicu- 

 ously yellowish, the intervening cells tinged with the same color. 



Two specimens. Ls nearest allied to F. ahdominalis Wied., but will 

 be distinguished by the lateral margins of the thoracic dorsum, and the 

 scutellum, not being so distinctly yellow; it also lacks the large trian- 

 gular yellow spot in front of the scutellum. 



Volucella avida. (Plate VI, fig. 12.) 



Foliicella avida 0.sten Sacken, West. Dipt., 333. 

 Habitat. — California ! 



S , 9 . Length, 10 to 12'"'". Antennae light brown ; arista loosely 

 plumose above; third antennal joint about one-half or two-thirds 

 of the length of the arista, its basal half a little expanded ; face pale 

 whitish-yellow, a narrow black stripe runs from the mouth upward, be- 

 coming paler and finally obsolete before reaching the antennie ; cheeks 

 black, shining ; frontal triangle of the male whitish-yellow, beset with 

 black pile ; profile straight, in the male with a slight depression under 

 the antennae, more receding on the lower part in the female. Thorax 

 greenish-black; on each side between the humerus and scutellum a 

 rather broad, dull, yellow stripe; in front of the scutellum a yellowish, 

 rather obscure parallelogram, marginate anteriorly; sides of the dorsum 

 and pleurae beset with yellowish- white hairs. Scutellum yellowish, sub- 

 translucent, beset with black hairs along the edge. Abdomen pale 

 honey-yellow; first segment black, the second and third segments pos- 

 teriorly with a narrow black margin, expanded on each side along the 

 lateral margin, and prolonged in the middle in the shape of a longitu- 

 dinal black stripe toward the anterior margin ; on the second segment 

 this stripe is broadly expanded so as to coalesce with the black of the 



