302 Annals Entomological Society of America  |Vol. XIV, 
to the caudal margin; marginals few, wide apart; conjunctiva coarsely 
granulated. 
Segment VII. Tergum divided into two lateral plates whose caudal 
extremities expand to form marginal plates; discal area hyaline; mar- 
ginals few, regular, with strong lateral bristles; accessory pieces absent. 
Sternum reduced to a small, ovoid sclerite adjacent to the caudal margin, 
the apices pointed, marginals wide apart, few; conjunctiva roughened. 
Segment VIII. Tergum yoke or collar-shaped, the tergites ill- 
defined with ragged borders that blend irregularly into the less chitinized 
semi-opaque discal area, a distinguishable, interrupted chitinous thick- 
ening along the mid-dorsal line that merges finally with the fused 
caudal pieces. The caudal margin of the segment, as in rubivora, is only 
recognized by the marginals due to the fusing of the heavily knobbed 
chitinous area of the fourth intersegment with the tergum which oblit- 
erates any definable line; marginals equal, regular with pronounced 
lateral setee. Sternum consists of two small, ovoid sclerites, tapering 
caudad; setz diverse, scattered over the entire surface. 
Segment IX. Suranal plate scoop-shaped, seteze approximate, strong; 
subanal plate spinulose, spade-shaped, setze widely separated, hairlike, 
setulae short, equal, distributed over the surface; cerci smooth, knobbed, 
long slender petiole; apicals long and fine, setule diverse, confined to 
the club; sense organs four. 
Chortophila levis Stein. 
Segments nearly twice the length of the preceding intersegment. 
Intersegments, spinulose, densely striated. 
Segment VI. Tergum undivided, encasing the dorsal surface as a 
shield, the chitin semi-opaque and somewhat thinner toward the mid- 
dorsal line on which region it is lightly spined; accessory pieces absent; 
marginals diverse, scattered irregularly around the caudal margin, con- 
tinuing cephalad in a single row along the ventral border; spiracles 
twice the breadth of the sternum apart, slightly oblique, the posterior 
spiracles on the caudal margin of the segment; area bounded by the 
caudo-ventral angles clothed with a few fine spinules. Sternum spin- 
ulose, club-shaped, the cephalic half but lightly chitinized; marginals 
distributed along the lateral borders for some distance; conjunctiva 
covered densely with short spinules. 
Segment VII. Similar in structure to segment VI; spinules thinly 
distributed over the tergal and sternal surfaces; discal area almost 
obliterated; marginals diverse, distributed irregularly along the caudal 
border; accessory pieces absent. Sternum spatulate, the cephalic half 
attenuated and but lightly chitinized; marginals distributed along the 
lateral margins; conjunctiva densely spinulose, striated. 
Segment VIII. Tergum composed of a fused marginal plate which 
extends as two lateral pieces, gradually tapering toward the cephalic 
margin; discal area thinly chitinized, merging imperceptibly with the 
chitin of the lateral plates; margins short, diverse, regular. Sternum 
{ Probably a new species though closely resembling laevis. 
