. Bulletin. Natural history; Natural history. Mav, 19H8 Staxxard: Thrips nr IiiiNois 489 smooth. Ocelli absent in apterous forms, present in macropterous forms. Eyes relatively small, slightly bulged. Postocular setae usually well devel- oped. Antennae seven or eight seg- mented; when eight segmented, seg- ments VII and VIII closely joined but separated by a fine suture; segment I inserted just forward of eye margin; segment II with dorsal sensoria api- cally placed; segment III smallest, pedicellate, with or without sense cones. Mouth cone broadly rounded. Maxillary stylets when at rest hardl
. Bulletin. Natural history; Natural history. Mav, 19H8 Staxxard: Thrips nr IiiiNois 489 smooth. Ocelli absent in apterous forms, present in macropterous forms. Eyes relatively small, slightly bulged. Postocular setae usually well devel- oped. Antennae seven or eight seg- mented; when eight segmented, seg- ments VII and VIII closely joined but separated by a fine suture; segment I inserted just forward of eye margin; segment II with dorsal sensoria api- cally placed; segment III smallest, pedicellate, with or without sense cones. Mouth cone broadly rounded. Maxillary stylets when at rest hardly retracted into head proper. Pronotum proportionately large, smooth; major anterior setae minute or well developed, posterior pairs the largest. Epimeral sutures incomplete. Praepectus seemingly present, though weakly developed. Macropterous or apterous. Fore wings when present not indented in middle, accessory fringe cilia lacking. Fore legs slightly to mod- erately enlarged, unarmed. Abdomen broadest part of body. Pelta broad, smooth. All tergites smooth, with well-developed lateral setae, wing-holding setae not differen- tiated in apterous forms. Abdominal sternite VIII with glandular area in male. Abdominal tergite IX with ma- jor lateral posterior setae (setae II of authors) reduced and spinelike in male. Tube short; anal setae slightly longer than tube. The characteristics of the extremely small size of antennal segment III, the complete fusion of antennal segments VII and VIII, and the short maxillary stylets that hardly enter into the head proper readily distinguish this genus in Illinois. Only one species, morgani, occurs in the southeastern part of the United States including southern Illi- nois; its congeners are from Brazil and Liberia (West Africa). In this genus, several species in- cluding morgani apparently inhabit and feed on mosses. Similarly, Lisso- thrips muscorum, which also has a small third antennal segment, fre- quents mosses within the range of Phthiro
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
