. Bulletin of the Lloyd Library of Botany, Pharmacy and Materia Medica. Botany; Pharmacy; Entomology; Fungi. RHYACOPHILIDiE. The Thorax.—The prothorax above is straw yellow, with a caudal margin of deep black; each episternum is extended for- ward in a spine-like process which has a black dorsal spot; the legs are straw RHYACOPHILA TORVA. 190. Larva. Head and thorax. 192. Larva. Prolegs, lateral view. 191. Larva. Frons. The meso- and meta-thorax are brown in alcoholic material, marked with light yellow, as in figure 190; the second and third pairs of legs are almost white. The Abdomen
. Bulletin of the Lloyd Library of Botany, Pharmacy and Materia Medica. Botany; Pharmacy; Entomology; Fungi. RHYACOPHILIDiE. The Thorax.—The prothorax above is straw yellow, with a caudal margin of deep black; each episternum is extended for- ward in a spine-like process which has a black dorsal spot; the legs are straw RHYACOPHILA TORVA. 190. Larva. Head and thorax. 192. Larva. Prolegs, lateral view. 191. Larva. Frons. The meso- and meta-thorax are brown in alcoholic material, marked with light yellow, as in figure 190; the second and third pairs of legs are almost white. The Abdomen.—The abdomen is narrower and less flattened than that of R. fuscula, the constrictions between segments are not quite so deep, and dorsal furrows of the integument are absent. Each segment has a similar dorsal pattern of light color, as shown in figure 190. The drag-hooks, figure 192, are slender and very simple compared to those of R. fuscula; there are no lateral spine- like elongations of the chitin, no dorsal humps at the base of the claws, and no ventral back-turned hooks. The drag-hooks are long and slender and comparatively weak. Description of Case.—We have made no observations on the case-building habits of the species. Vorhies, who reared it in Wisconsin, states that "the larva lives in a loosely-built case of gravel," and "at the time of pupation this becomes a strong, irregu- "5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lloyd Library and Museum; Lloyd Library of Botany, Pharmacy and Materia Medica. Cincinnati, The Lloyd Library and Museum
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