166 Tue BuowFruies or Norta AMERICA 
Larva. First instar?: Length 2-3 mm., diameter 0.3 mm. — 
Tapering slightly to the anterior segments, which taper sharply, 
the segmentation distinct, each body segment marked with a 
series of transverse bands of short dark chitinous points. Cepha- 
loskeleton (pl. 37, A) very characteristic in this stage, the labial 
selerites slender, nearly rectilinear, and at the anterior extremity 
with paired stomal plates, each of which has six minute teeth; 
hypostomal sclerite with a long rectilinear anterior process, the 
main part a broad dorsoventral bar of chitin produced posteri- 
orly at both the dorsal and ventral angles as a tapering and re- 
latively narrow process; dorsal sclerite slender, strongly looped 
and uniting the two lateral pharyngeal plates. Metapneustic; 
posterior spiracles each with one well-developed, narrowly oval 
orifice and a rudimentary second. 
Second instar: Length 3.5-6.0 mm., diameter, 1.0-2.0 mm. 
General characteristics about as in previous instar but spinose 
bands not so apparent. Cephaloskeleton (pl. 37, B) with labial 
sclerites moderately heavy, somewhat decurved and irregular, | 
united by a broad dorsal process; pharyngeal sclerite a broad 
dorsoventral plate with a curved process on anterodorsal angle, 
and another longer one on posteroventral angle, the dorsal cor- 
nua rather broad and elongate. Structure of anterior spiracle 
rather indistinct but with 10 or 11 circular orifices; posterior 
spiracles (pl. 37, D) each with two distinct ovate slitlike aper- 
tures. 
Third instar: Length 9-17 mm., diameter 3-4 mm. Typically 
muscoid in habitus, creamy translucent white, yellowing with 
maturity. Segments 3-9 anteriorly with complete spinose bands, 
segment 10 with band weak dorsally; segment 2 dorsoanteriorly 
with spines; all segments except cephalic one with ventral spinose 
bands; segments 11 and 12 without dorsal spines; segments 8-11 
posteroventrally with weak bands of single-pointed spines. 
Spines on anterior segments small; spines wedge- or dome- 
shaped with from one to four pointed (usually two sharp points), 
and pigmented only on tips. Anterior spiracles each with 10-11 
rounded, radially arranged orifices; posterior spiracles (pl. 37, 
E) each with three subparallel, slitlike apertures, the peritreme 
incomplete, the ‘‘button’’ hardly apparent. Anal area with 
spiracles located in depression somewhat deeper than typical for 
ealliphorid larvae, distinctly cup-shaped; dorsally with six near- 
ly equidistant, low tubercles, median tubercles separated by a 
distance approximately one and one-half times the diameter of 
a spiracular plate, outer tubercles largest; ventrally with six 
*Adapted from Felt (1913). 
