310 Annals Entomological Society of America  [Vol. XIV, 
Hylemyia setiventris Stein. 
Segments and intersegments of equal length, sclerites glabrous 
except the subanal plate which is pubescent. Intersegments heavily 
spinulose except the fourth, which is smooth throughout. 
Segment VI. Tergum divided by a lightly chitinized discal area into 
two heavily chitinized lateral plates whose caudal and cephalic extrem- 
ities expand dorsad along their respective segmental margins, almost 
fusing across the mid-dorsal line, the plates blend imperceptibly with 
the discal area; accessory pieces present; marginals few, even, regular; 
spiracles wide apart, oblique, posterior spiracles cephalad of the acces- 
sory pieces and twice the diameter of the anterior spiracles, the latter 
small, situated in the conjunctiva. Sternum elongate, extending the 
length of the segment, tapering cephalad; marginals divided into two 
lateral groups; conjunctiva densely spinulose. 
Segment VII. Tergum separated by a lightly chitinized discal 
area into two broad lateral plates that tend to approximate cephalad, 
the caudal extremities expanded dorsad aloilg the margin; accessory 
pieces present; marginals equal, regular. Sternum lanceolate, extending 
for the length of the segment, tapering at both ends; marginals divided 
into two lateral groups; conjunctiva spinulose except for a cephalic 
area bordering the segmental margin. 
Segment VIII. Tergum composed of two lateral rodlike chitinous 
plates that partially enclose a spacious, lightly chitinized discal area, 
the plates approximate at the cephalic margin, caudad the extremities 
adhere to the margin as chitinous strips, nearly fusing across the mid- 
dorsal line; marginals diverse, regular, terminating at both sides in a 
group of setze. Sternum reduced to two, broadly ovoid sclerites adjacent 
to the caudal margin; setz distributed over the entire surface; con- 
junctiva smooth. 
Segment IX. Suranal plate scoop-shaped to hemispherical, armed 
with six or seven stout black spines; subanal plate spade-shaped, 
pubescent, setze and setule long, fine, hairlike, the latter distributed 
densely over the surface; cerci smooth, knobbed, sessile, armed with 
numerous stout upcurving spines on the dorsal surface, on the ventral 
surface clothed with fine, hairlike sete; sense organs consist of two tuber- 
cles, situated laterad, from which emerge two bristlelike papille. 
Hylemyia -strigosa var. nigrimana Fabricius.t 
Ovipositor short, compact, equalling the fifth abdominal segment in 
length. Segments much longer than the intersegments, breadth three 
times the length. Intersegments spinulose except the fourth which is 
smooth on the ventral surface. 
Segment VI. Tergum smooth, composed of a broad, bandlike discal 
area, lightly chitinized, separating two small quadrangular plates which 
are confined to the lateral margins of the segment; accessory pieces 
absent; marginals few, regular; spiracles large, exceeding the breadth 
of the sternum apart, posterior spiracles mesad of the anterior, both 
+ European specimen. 
