. Bulletin. Natural history; Natural history. May, 1968 Stan'Nard: Tiif. Thrii's of Illinois .â ^81 Abdominal tergite X tubular (Fig. 186-191). Major anal setae arising from sclerites separated from abdomi- nal segment X. Three pupal instars present in those species where life history is known. Contains the single family Phlaeo- thripidae, which is divisible into two subfamilies, Phlaeothripinae and Me- gathripinae. Apparently Bagnall (19086) was the first to separate the Tubulifera into two groups, the Phlaeothripidae and the Idolothripidae. In many re- spects these divisions are the same as
. Bulletin. Natural history; Natural history. May, 1968 Stan'Nard: Tiif. Thrii's of Illinois .â ^81 Abdominal tergite X tubular (Fig. 186-191). Major anal setae arising from sclerites separated from abdomi- nal segment X. Three pupal instars present in those species where life history is known. Contains the single family Phlaeo- thripidae, which is divisible into two subfamilies, Phlaeothripinae and Me- gathripinae. Apparently Bagnall (19086) was the first to separate the Tubulifera into two groups, the Phlaeothripidae and the Idolothripidae. In many re- spects these divisions are the same as the Phlaeothripinae and Megathripi- nae used here. Further additions to and other subdivisions of the Tubuli- fera were made in the next few years following Bagnall's proposal. In 1915 Hood added Pygothripidae to the list which by then also included Hystrico- thripidae, Megathripidae, and Uro- thripidae. Simplification of the system came about in 1927 when Priesner re- duced the main division to the Phlaeo- thripinae and Megathripinae. Except for occasional shifts of genera from one tribe to another as more information is discovered to warrant the transfer, these two divisions seem phylogene- tically proper for the initial grouping of the genera of Tubulifera (Stannard 19576). Priesner (1960) recognized the Urothripinae as the third subfamily in his system, an action not followed in this report. PHLAEOTHRIPIDAE Uzel (1895) KEY TO GENERA (Illinois, except where noted) 1. Hind coxae spaced farther from each oth- er than are the middle coxae 2 Hind coxae closer together than are the middle coxae 3 2. Head without prominent anterior setae (Fig. 151) Am- phibolothrips subgenus Trachythrips Head with one, two, or three pairs of prominent setae along the anterior mar- gin between the eyes (Fig. 152); not yet found in Illinois Am- phibolothrips subgenus Stephanothrips 3. Prothorax with anteromarginal and an- terolateral setae placed extremely close together (Fig. 277); antennal segmen
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