SUBFAMILY CALLIPHORINAE 229 
and dorsal surfaces; segment 9 with spines almost colorless; 
number of rows of spines reduced to one or two on segment 9; 
segment 10 with several rows of light-colored spines laterally 
which may extend to laterodorsal surface but do not join to 
form a complete band; posterior border of segment 11 with two 
or three rows of rather dark spines dorsally; on segment 10 the 
spines narrowed to one or two rows of lighter spines; dorsal 
surface of segment 9 with or without one or two irregular rows 
of almost colorless spines at posterior border; border of pos- 
terior cavity with small pigmented hairlike spines. Tubercles 
on segment 12 with inner pair on upper border separated by a 
distance approximately equal to distance between inner and 
outer tubercles; median pair on upper border and inner pair on 
lower border inconspicuous. Cephalopharyngeal sclerite (1.39, 
EK) comparatively strong and heavily pigmented; dorsal and 
ventral cornua approximately equal in length and width; an- 
terior projection of pharyngeal sclerite rather short and joined 
by a narrow dorsal arch; hatching spine well-developed. 
Second instar: Segments 2 to 9 each having anterior border 
provided with a complete band of spines; dorsal spines absent 
on segment 10 but one or two rows sometimes extending well up 
on laterodorsal surface; posterior border of segments 9-12 each 
with complete band of spines, reduced on segment 9 to one 
or two irregular rows; segment 8 with spines restricted to ven- 
tral and lateral surfaces. Tubercles on upper border of last 
segment broadly rounded and in relative size similar to those 
of third instar; inner pair on lower border approximately one- 
third as large as the median and outer pair; distance between 
inner tubercles on upper border as great or greater than distance 
between inner and outer ones. Cephaloskeleton (pl. 39, F) with 
dorsal cornua of almost uniform width to posterior end where 
it sharply tapers to a point; dorsal posterior projection of basal 
portion of labial sclerites broad and bluntly rounded. Anterior 
spiracles with six to eight branches. 
Third instar: Spinous bands encircling body at anterior mar- 
gins of segments 2-9; segment 10 with band of spines generally 
incomplete dorsally fae a short space; segment 11 with spines 
above venter restricted to one or two irregular dorsal rows; 
posterior border of segment 11 with five or six irregular rows 
of spines on dorsum; segment 10 usually with one or two irregu- 
lar dorsal rows, sometimes incomplete; dorsal spines generally 
absent on segment 9 and those anterior to it. Conical tubercles 
or fleshy protuberances outlining stigmal field rather large and 
prominent; inner and outer pairs on upper border nearly equal 
