. Bulletin. Natural history; Natural history. 342 A 342 mmmm 343. 345 Fig. 342.—Hydropsyche simulans larva, apex of abdomen, dorsal aspect; A, enlarged portion of epidermis. Fig. 343.—H. arinale larva. Fig. 344.—H. recurvata larva. Fig. 345.—H. aerata larva, apex of abdo- men, ventral aspect. 5. Head chiefly yellow or straw color with a dorsal mark resembling a cross, fig. 349, the surface shining and without short, black hair; base of anal legs with a patch of brown, flat spines, fig. 345 aerata, p. 101 Head either with more extensive dark markings, fig. 354, or with abundant, short, black ha
. Bulletin. Natural history; Natural history. 342 A 342 mmmm 343. 345 Fig. 342.—Hydropsyche simulans larva, apex of abdomen, dorsal aspect; A, enlarged portion of epidermis. Fig. 343.—H. arinale larva. Fig. 344.—H. recurvata larva. Fig. 345.—H. aerata larva, apex of abdo- men, ventral aspect. 5. Head chiefly yellow or straw color with a dorsal mark resembling a cross, fig. 349, the surface shining and without short, black hair; base of anal legs with a patch of brown, flat spines, fig. 345 aerata, p. 101 Head either with more extensive dark markings, fig. 354, or with abundant, short, black hair, or base of anal legs without a patch of spines 6 6. Entire dorsum and lateral portion of head bright brownish red, uniform except for a fine pattern of yellow- ish spots, fig. 350; preclypeus with sclerotized areas at sides, labrum with yellow or pale hair. .cuanis, p. 100 Dorsum of head with either a definite pale and yellow pattern, fig. 353, or mostly dark brown; preclypeus without lateral sclerotized areas, la- brum usually with pale hair 7 7. Scale-hairs sparse on dorsum of ab- domen, on sixth segment no more abundant than in fig. 343 arinale, p. 104 Scale-hairs at least as abundant as in fig. 342 8 8. Head with dorsal pattern merging gradually and not contrasting much with ground color, fig. 352 simulans, p. 104 Head with a well-delimited dorsal, dark brown mark contrasting with ground color, figs. 353, 354 9 9. Dorsal mark on head wider, extending full width of head, ending in line with eyes, cut ofl^ with a sharper and straighter margin, fig. 353; simple hairs on abdomen as dark and con- spicuous as scale-hairs. .hageni, p. 103 Dorsal mark of head not extending to margin of head, margin irregular, fig. 354; simple hairs on abdomen much lighter than scale-hairs frisoni, p. 105 10. Head mostly black or blackish brown with one or two mesal yellow squares, fig. 355 slossonae, p. 99 Head with a definite checkered pat- tern, the checks either surrounded by black,
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