306 Annals Entomological Society of America  [Vol. XIV, 
the tergum, the sternites extend along the subdorsal axes, tapering to a 
point caudad; marginals short, bristlelike; conjunctiva hyaline, 
transparent, the caudal half of the lateral membranes clothed with 
dense, broad spinules, scalelike. 
Segment IX. Suranal plate broad, scoop-shaped, setz strong, the 
width of the club apart; subanal plate spinulose, broadly conical, sete 
short, in a transverse row across the apical third, setulee small, thornlike; 
cerci smooth, knoblike, sessile; setae few, apicals stout, setulee bristle- 
like; sense organs two, contiguous, papillae of medium length, not 
domelike. 
Chortophila rubivora Coquillett. 
Segments and intersegments of equal length. Sclerites glabrous. 
Intersegments densely spinulose except the fourth which is smooth but 
for a few spinules along the cephalic margin of the dorsum. 
Segment VI. Tergum an unevenly chitinized plate which presents 
two lateral thickenings and a thinly chitinized mid dorsal region; discal 
area indeterminate; marginals diverse, regular; spiracles closer together 
than the width of the sternum, oblique, posterior spiracle cephalad of 
the caudal margin; accessory pieces absent. Sternum broadly lanceo- 
late, tapering at both extremities to the margins of the segment; mar- 
ginals approximating, continued for a short distance along the lateral 
borders; conjunctiva spinulose, densely covered. 
Segment VII. Tergum similar in structure to segment VI except 
that the chitin is thinner and tends to separate the tergum into two 
lateral, thickened plates; discal area vestigial; marginals diverse, 
somewhat irregularly arranged; accessory pieces absent. Sternum 
lanceolate, tapering to both margins, marginals approximate; con- 
junctiva spinulose. 
Segment VIII. Tergum composed of two lateral chitinous plates 
which have fused along the caudal margin across the mid-dorsal line. 
Frequently a tonguelike chitinous thickening appears on the discal area 
which fuses caudad with the marginal plate; discal area chitinized; 
marginals short, spinelike, regular, denoting the fusion of the firmly 
chitinized fourth intersegment with the caudal margin of the segment 
with which it appears to form an integral part, similar in structure to 
substriata. Sternum composed of two narrow sternites that attain 
three-quarters the length of the segment, pointed caudad; sete few, 
short, spinelike; conjunctiva spinulose. 
Segment IX. Suranal plate triangular; seta approximate, strong, 
the base of the plate closely coincident with the margin of the fourth 
intersegment; subanal plate, smooth, spadelike to conical; marginals 
apart, a fringe of setulae around the apex, the surface sparsely covered 
with setulze; cerci smooth, clavate, petiolate; apicals long, setulz 
covering club and petiole; sense organs two, contiguous, subapical. 
ee 
