. Bulletin. Natural history; Natural history. 502 Illinois Natural History Slrvev Billetix 111. \i.'J, >9, An. -1 Head longer than wide, surface smooth except for a few transverse striae at base of head. Ocelli present. Postocular ? setae (affinities not cer- tain) long and dilated to blunt. An- tennae (Fig. 160) inserted in front of eyes on slight, forward protrusion of head; seven or eight segmented; mor- phological segment III cup shaped, broadly attached to segment IV or completely fused to IV as in one South American species. Mouth cone (Fig. 195) broadly rounded. Maxillary sty- lets w
. Bulletin. Natural history; Natural history. 502 Illinois Natural History Slrvev Billetix 111. \i.'J, >9, An. -1 Head longer than wide, surface smooth except for a few transverse striae at base of head. Ocelli present. Postocular ? setae (affinities not cer- tain) long and dilated to blunt. An- tennae (Fig. 160) inserted in front of eyes on slight, forward protrusion of head; seven or eight segmented; mor- phological segment III cup shaped, broadly attached to segment IV or completely fused to IV as in one South American species. Mouth cone (Fig. 195) broadly rounded. Maxillary sty- lets when at rest retracted well into the head. Prothorax smooth, with a median transverse ridge. Anterolateral and major posterior setae well developed, anteromarginal setae closely placed near anterolateral setae and moderate- ly short to small, midlateral setae mi- nute. Epimeral sutures incomplete. Praepectus not discernible. Probasi- sternal plates seemingly very large. Metanotum with a few median stria- tions. Meso- and metasternum with a continuous longitudinal ridge con- necting the furcae. Macropterous, wings extremely narrow, fore wings with cilia widely spaced, without ac- cessory fringe cilia. All tarsi apparent- ly one segmented. Pelta (in the type-species at least) divided into three parts. Wing-holding setae well developed, sigmoidal in shape. Males seemingly without glan- dular areas, major lateral setae on the posterior margin of abdominal tergite IX not reduced more than in female. Tube short, slender in some species, stout in others. Body setae pointed, blunt, or mod- erately dilated. This genus is represented in our state by the type-species, minuta, which is the smallest tubuliferan in our fauna. Preeriella most closely resembles Hijidiothrips, a neotropical genus that does not occur north of Mexico and southern Florida as far as is known. The diagnostic characteristics of minuta should suffice for the recog- nition of the genus in the biota of Illinois. Preeriel
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
