312 Annals Entomological Society of America °|Vol. XIV, 
Genus Pegomyia Desvoidy. 
Pegomyia affinis Stein. 
Segments slightly longer than the intersegments except segment 
and intersegment eight which are foreshortened, sclerites glabrous. 
Intersegments smooth, hyaline, transparent. 
Segment VI. Tergum thinly chitinized, covering the entire dorsal 
region, margins indeterminate; accessory pieces present; marginals 
diverse, slightly irregular; spiracles approximate, oblique, cephalad of 
the accessory pieces. Sternum lanceolate, extending for the entire 
length of the segment, expanding slightly caudad; marginals distributed 
laterad; conjunctiva smooth, hyaline. 
Segment VII. Tergum divided by a hyaline discal area into two 
lateral pieces which extend from margin to margin as more or less 
uniform plates; accessory pieces large, distinct; marginals diverse, 
irregular. Sternum spatulate, the caudal extremity flaring, truncate; 
marginals approximate, distributed in a semi-circle around the margin; 
conjunctiva smooth, hyaline. 
Segment VIII. Tergum reduced in size to form a lightly chitinized, 
archlike plate, the margins indeterminate, blending imperceptibly with 
the discal area. Sternum consists of two small elongate sclerites one- 
half the length of the segment; sete few, distributed on the caudal 
third; conjunctiva smooth. 
Segment IX. Suranal plate triangular to conical; setze short, approx- 
imate, less than the width of the club apart; subanal plate broadly 
spade-shaped; sete irregular, approximate; setulae absent; cerci 
smooth, small, knobbed, sessile; apicals short, stout; setulae distributed 
on the distal portion of the club. 
Pegomyia calpytrata Zetterstedt. 
Ovipositor short, compact, slightly longer than the fifth abdominal 
segment, spinulose throughout, segments longer than the intersegments, 
breadth twice the length. Intersegments reduced to narrow transverse 
membranes. 
Segment VI. Tergum completely chitinized encasing the entire 
tergal region, posterior angles produced ventrad to embrace the sides 
of the segment; marginals few, one or two; accessory pieces present, 
distinct; spiracles in the same plane, not oblique, wide apart, posterior 
spiracles situated on the caudal margin of segment. Sternum consists 
of an oblong sclerite, truncate at both extremities, extending the entire 
length of the segment, the posterior region densely covered with black, 
short spines, which continue sparsely along the lateral borders; con- 
junctiva spinulose. 
Segment VII. Tergum similar in structure to segment VI; mar- 
ginals diverse, regular, confined to the caudal margin of the posterior 
angles of the tergum; accessory pieces absent. Sternum broadly conical, 
the apex reaching the cephalic margin, posterior half densely clothed 
with black, short spines, hooked at the tip; conjunctiva spinulose. 
