Hood — An Outline of the Insect Order Thysanoptera, 55 



segment, can not prove very satisfactory, striking though such 

 structures may at first appear. 



It has been deemed necessary to replace the name JEolothri- 

 pides with ^Kolothripoidea, and Thripides with Thripoidea, and 

 to alter their designations from " tribe " to " superfamily," in 

 accordance with accepted modern usage as established by 

 Dr. Theodore Gill (1898). The name Polystigmata is placed 

 as an unavailable synonym of a new superfamily (Urothripoidea) 

 of the Tubulifera. The family Ecacanthothripidse is here con- 

 sidered a synonym of the family Phloeothripidae, its distinction 

 having been based on what appear to be minor characters. 



Finally, before undertaking the definition of the various 

 groups under consideration, it may be interesting to note that 

 the most generalized superfamily, the ^olothripoidea, was 

 proportionately much more abundantly represented in the 

 Tertiary geological epoch than at present, while the specialized 

 Phloeothripoidea, which are now probably the most numerous 

 of all, were then represented by only one known species. The 

 Urothripoidea are unknown as fossils. The following table, 

 partly from Handlirsch (1908), shows these points very clearly: 



Order Thysanoptera Haliday, 1836. 



1744. Genus Physapus De Geer 



1758. Genus Thrips Linne 



1806. Family Vesitarses ou Physapodes Dumeril 



1814. Family Thripsides Fallen 



1825. Tribe Thrypsides. Physapi Latreille 



1829. Family Thripidse Stephens 



1835. Order Thrypsites Newman 



1835. Order Thripsites Newman 



