VOLUME 55, NUMBER 1 
15 
sclerite (Fig. 7); setae 3, 4, 5, 6, 10, 12, (13 or 15?), 16 and 17 short, setae 
1, 2, 7, 8, 11 and 14 medium and seta 9 long in length. Labrum with a dense 
covering of short unbranched setae on anterior three-quarters of dorsum, 
one pair of setae near anterior margin longer than other setae. Mandibles 
(Fig. 14) with a deep lateral trough, numerous setae along base of trough. 
Left mandible (Fig. 14a) with an apical and subapical tooth on dorsal part, 
brush of small setae near mesal margin of subapical tooth; ventral part with 
an apical and four subapical teeth, basal subapical tooth short, rounded 
triangular, a brush of long setae above basal tooth. Right mandible (Fig. 
14b) with a single tooth on dorsal part, brush of small setae situated oblique¬ 
ly on tooth; ventral part with an apical and four subapical teeth; basal sub¬ 
apical tooth short rounded triangular. Submentum (Fig. 8) with lateral sur¬ 
face on each side bulging upward from base of apical lobe posterad to 
posterolateral corner; setae grouped near base of each apical lobe and in an 
oblique line on each posterolateral corner; anterior margin of each apical 
lobe rounded or rounded triangular. Anterior ventral apotome (Fig. 7) with 
a bump on meson near anterior margin; lateral arms long, narrow, enlarged 
slightly at apex. Proventricular teeth of foregut each with a single apical 
denticle (Fig. 9), long basal portion with several scattered bead-like areas, 
support bars absent. 
Pronotum, mesonotum and metanotum (Figs. 6a, b, c) each yellow to 
brown, covered with a dense covering of short scale-like setae and even 
shorter pointed setae (Fig. 6); pronotum (Fig. 6a) with scale-like setae only 
on anterior three-quarters, anterior margin with numerous fine setae; meso¬ 
notum (Fig. 6b) and metanotum (Fig. 6c) each with scale-like setae pro¬ 
jecting beyond anterior margin. Trochantin of propleuron (Fig. 10) with 
numerous setae along ventral portion, dorsal apical lobe upturned and point¬ 
ed. Foreleg with minute branched setae on most of posterior surface of 
coxa; femur with prominent lobe on middle of anterodorsal surface (Fig. 
11). Midleg with branched setae only on ventral part of posterior surface of 
coxa; femur (Fig. 12) with branched setae on anteroventral surface (Fig. 
13); no branched setae on tibia or tarsus. Hindleg without branched setae 
on posterior surface of coxa; femur with branched setae on anteroventral 
surface; tibia and tarsus without branched setae. Mesosternum with one 
pair of gills, each gill with a single trunk; metasternum with two pairs of 
gills, each gill with a single trunk. 
Figs. 10-13. Morphological features of Hydropsyche separata. Fig. 10—Trochantin and 
propleuron, lateral aspect; t = trochantin, p = propleuron. Fig. 11—Foreleg, anterior as¬ 
pect. Fig. 12—Midleg, anterior aspect. Fig. 13—Ventral margin of femur, anterior aspect 
showing branched setae. 
