Proceedings of the United States National Museum . O • 1 m m ,-1 ;;i. Figure 47.—Diplazoninae, head sclerites: a, Diplazon laetatorius (Fabricius); b, Zootrephusrufiventrus (Gravenhorst); c, Syrphoclonus maculifrons (Cresson). (Antenna not visibleon preparation; 2, spiracle; 3, skin.) 478 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no presumably disc-shaped with an unsclerotized circumference; thespiracle has an oval atrium and the closing apparatus, which has thinwalls, adjoins the atrium in some genera but not in others; the closingapparatus has a length equal to five to seven times the depth of
Proceedings of the United States National Museum . O • 1 m m ,-1 ;;i. Figure 47.—Diplazoninae, head sclerites: a, Diplazon laetatorius (Fabricius); b, Zootrephusrufiventrus (Gravenhorst); c, Syrphoclonus maculifrons (Cresson). (Antenna not visibleon preparation; 2, spiracle; 3, skin.) 478 PROCEEDINGS OF THE NATIONAL MUSEUM vol. no presumably disc-shaped with an unsclerotized circumference; thespiracle has an oval atrium and the closing apparatus, which has thinwalls, adjoins the atrium in some genera but not in others; the closingapparatus has a length equal to five to seven times the depth ofthe atrium; the skin is very smooth and appears to lack setae andprojections. Larval Key 1. Lateral parts of labial sclerite produced into relatively sharp angles and not rounded Syrphoctomis Lateral parts of labial sclerite less sharp and more rounded 2 2. Labial palps lobed Promethus ^ Labial palps oval 3 3. Length of labial spine approximately equal to depth of main ventral part of labial sclerite Biplazon Length of labial spine shorter than depth of main vent
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
