12 
PAN-PACIFIC ENTOMOLOGIST 
Figs. 1-5. Morphological features of Hydropsyche separata. Fig. 1—Head, dorsal aspect; 
t = tentorial pit, f = frontoclypeal apotome, m = muscle scar, p = parietal sclerite. Fig. 2— 
Setae on posterior portion of frontoclypeal apotome. Fig. 3—Setae on dorsum of parietal 
sclerite. Fig. 4 —Structure within cuticle near posterior tip of frontoclypeal apotome (arrow 
extending from f in Fig. 1 indicates approximate position of structure). Fig. 5—Frontoclypeal 
apotome showing only coloration. 
