134 BULLETIN. BROOKLYN ENTOM. SOC. VOL. VU. February 1885.] 
XANTHOGRAMMINAE, 
Mostly elongate, small, thinly pilose species, deep shining black or 
shining green, with bright yellow markings on face, lateral dorsal mar— 
gins of thorax, and abdomen. Antenne short, face tuberculate; marginal 
cell of wings wide open, third longitudinal vein only slightly curved, 
small cross-vein near the base of discal cell; legs slender; hind femora 
rarely thickened (Mesograpta). 
A.—Kyes of male with an area of enlarged facets above; fourth segment of abdomen 
in both sexes with two yellow median stripes and an oblique spot on each side.... 
Allograpta, O. S. 
AA.—Eyes of male wholly without an area of enlarged facets above; fourth segment 
of abdomen fasciate. 
B.—Ocelli situated near the vertex; abdomen oval, of six visible segments; thorax 
without median dorsal cinereous line............. Xanthosramma, Schiner. 
BB.—Ocellar tubercle remote from the vertex; slender species. 
(.—Dorsum of thorax with a median cinereous line....... Mesoerapta, Loew. 
CC.—Dorsum of thorax without such line........ Sphoerophoria, St. F. & Serv. 
SYRPHINAE. 
Rather large species*, black or greenish black, usually with yellow 
abdominal bands; the face always wholly or in part yellow, the dorsum 
of thorax without yellow lateral stripes; moderately pilose. Marginal cell 
of wing wide open, third vein rarely (Didea) curved into the first posterior 
cell, anterior cross-vein near the base.of discal cell. Antennze short, 
face tuberculate**, abdomen oval, rarely elongate, never club-shaped; 
legs slender, hind femora never thickened. 
A.—Thickly pilose species; abdomen quite oval, broader beyond the middle. Basal 
portion of abdomen yellow, terminal portion black, wings with a dark spot...... 
Leucozona, Schiner. 
AA.—Rather bare species; abdomen with yellow bands, either all entire or one or all 
interrupted. 
B.—Hind femora extraordinarily thickened. (Syritta). 
BB.—Hind femora not thickened. 
C. —Eyes of male with an area of enlarged facets above; front very convex; 
la OO Nemo WIA? SiMe ee og cas daceuoaceacaccs Catabomba, VU. S. 
CC.—Eyes of male without an area of enlarged facets above; front moderately 
convex; hypopygium not very small. 
* Species of Paragus (Pipizinee) wiil be sought for here; they are small, finely 
_punctulate, nearly bare, with or without the abdomen more or less red. 
** Tf the face is concave, from antennee to oral margin, and the hind femora very 
much thickened compare Syritta (Xylotine). 
