. Bulletin. Natural history; Natural history. 232 233 Polycentropus Larvae, Heads Fig. 230.—P. cinereus. Fig. 231.—P. centralis. Fig. 232.—P. reniotus. Fig. 233.—P. interruptus. ent shade than background flavus, p. 68 Head with spots conspicuous 4 4. Upper part of frons long, subequal in length to lower portion, fig. 232; hair on basal segment of anal ap- pendages in irregular lateral areas. remotus, p. 67 Upper part of trons shorter than lower portion, fig. 233; hair on basal seg- ment of anal appendages in regular rows, fig. 229 5 5. Dorsum of head usually clouded with reddish brown; major p
. Bulletin. Natural history; Natural history. 232 233 Polycentropus Larvae, Heads Fig. 230.—P. cinereus. Fig. 231.—P. centralis. Fig. 232.—P. reniotus. Fig. 233.—P. interruptus. ent shade than background flavus, p. 68 Head with spots conspicuous 4 4. Upper part of frons long, subequal in length to lower portion, fig. 232; hair on basal segment of anal ap- pendages in irregular lateral areas. remotus, p. 67 Upper part of trons shorter than lower portion, fig. 233; hair on basal seg- ment of anal appendages in regular rows, fig. 229 5 5. Dorsum of head usually clouded with reddish brown; major pair of setae of upper frons with a small pale area around base interruptus, p. 69 Dorsum of head usually not clouded with reddish brown; major pair of setae of upper frons with a brown ring around base glacialis, p. 68 Adults 1. Genitalia complex, with an aedeagus, figs. 234-248 (males) 2 Genitalia without an aedeagus, figs. 249, 250 (females) 16 2. Eighth sternite produced into a long, apical projection, figs. 234, 235. ... 3 Eighth sternite not produced into an apical projection, fig. 236 4 3. Apical projection of eighth sternite wide and incised on meson, fig. 234 aureolus, p. 64 Apical projection of eighth sternite narrow and pointed, fig. 235 crassicornis, p. 64 4. Cerci with dorsal angle produced into a long, down-curved, sclerotized needle, fig. 242 5 Cerci without such a sclerotized proc- ess, fig. 236 11 5. Ninth sternite narrow; cerci with a narrow, finger-like projection from latero-caudal margin, fig. 242 pentus, p. 65 Ninth sternite wide; cerci without a finger-like projection from latero- caudal margin, fig. 243 6 6. Aedeagus long and U-shaped, fig. 243 maculatus, p. 65 Aedeagus straight or only slightly curved, figs. 244, 246 7 7. Baso-dorsal appendage of clasper almost sessile, without a definite stalk, fig. 244, and projecting lat- erad of clasper confusus, p. 65 Baso-dorsal appendage with a definite stalk so that the dark mesal point is some distance f
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