316 Annals Entomological Society of America  [Vol. XIV, 
Segment VII. Tergum lightly chitinized, the sides and the caudal 
margin slightly thickened into two faintly perceptible lateral plates 
which are separated by a hyaline, transparent discal area; accessory 
pieces present, armed with stiff, stout bristles. Sternum densely spinu- 
lose, reduced to a short transverse sclerite adjacent to the caudal 
margin; marginals scattered; conjunctiva smooth, constricted at the 
caudal limits by the accessory pieces. 
Segment VIII. Tergum composed of two lateral plates, broadly 
separated throughout by a spaceous hyaline discal area, the caudal 
region characterized by a tuft of dense short hair, the caudal margins 
of the tergites are armed with a few stout stiff bristles. Sternum densely 
spinulose, composed of two somewhat raised sclerites adjacent to the 
caudal margin and nearly fusing across the mid ventral line, the outer 
halves of each sternite bear numerous stiff setae; conjunctiva smooth for 
the greater part, sparsely spinulose along the caudal margin. 
Segment IX. Suranal plate scoop-shaped; sete approximate, 
short, stout; setulae few; subanal plate spinulose, conical; setule few; 
subanal plate spinulose, conical; setee apical; setule long, spinelike, 
sparsely distributed over the distal half; cerci small, subcylindrical; 
apicals short and stout; setulae few, stout, confined to the club; sensory 
organs tubercular, spined, scattered over the club. 
Pegomyia winthemi Meigen. 
Segments slightly longer than the intersegments, sclerites glabrous 
except the sternum of segment eight which is pubescent and the subanal 
plate which possesses a few scattered spinules. Intersegment one 
spinulose throughout; the second spinulose along the cephalic region 
and for a short distance caudad along the mid dorsal and mid-ventral 
lines, the remaining surfaces smooth; intersegment three smooth on 
the dorsal surface with a narrow strip of spinules along the cephalic 
margin, densely spinulose for three-quarters the length of the ventral 
surface, the caudal margin smooth, hyaline; fourth intersegment 
spinulose throughout. 
Segment VI. Tergum completely but thinly chitinized, encasing 
the entire tergal region; accessory pieces absent; marginals diverse 
regular; spiracles situated close together, oblique, less than the width 
of the sternum apart. Sternum lanceolate, attaining the length of the 
segment, apex rounded caudad; marginals approximate, divided into 
two groups; conjunctiva spinulose for the caudal third, smooth for the 
remainder of the surface. 
Segment VII. Tergum composed of two broad lateral plates whose 
caudal extremities fuse across the mid-dorsal line, cephalad the chitin- 
ization is well maintained; discal area hyaline; marginals diverse, 
irregular. Sternum reduced to a short lanceolate sclerite attaining one- 
half the length of the segment, pointed caudad, tapering cephalad; 
marginals preapical, in two groups; conjunctiva spinulose for the 
caudal third, smooth for the remaining surface. 
