ARTICLE I].—New Genera and Species of Illinois Thysanoptera. 
ibx|. Doucias Hoop. 
In the present paper, descriptions are given of five new genera 
and fifteen new species of Illinois Thysanoptera. For much of the 
material upon which these descriptions are based, I am indebted to - 
several of my friends and associates, among whom may be mentioned 
Charles A. Hart, Robert D. and Hugh Glasgow, John J. Davis, Lindley 
M. Smith, Henry E. Ewing, James Zetek, Frank C. Gates, and George 
H. Coons. 
In the measurements, non-chitinous portions have been excluded. 
For example, the length of the prothorax is taken to be its length 
along the median dorsal line, exclusive of the membrane connecting 
it with the head. 
Type specimens are in the writer’s collection, and in the collection 
of the Illinois State Laboratory of Natural History. 
SUBORDER TEREBRANTIA Hatripay 
Famity THRIPIDA Uczel. 
HETEROTHRIPS gen. nov. (Fig. 1.) 
(éteoos, other than usual; Oped, thrips.) 
Head wider than long. Ocelli present. Antenne 
clearly nine-segmented; segments 3 and 4 conical, 
large, their combined lengths about equal to that 
of segments 5—9, each with an apical band enclos- 
ing small circular sensoria (?), disposed in two nearly 
regular transverse rows; segments 5—9 much nar- 
rower than 3 and 4, successively diminishing in 
diameter; segments 5-8 provided each with either 
one or two slender sense cones. Maxillary palpi 
three-segmented. Prothorax twice as long as head, 
sides decidedly arcuate; not armed with long spines. 
Second fore tarsal segment armed with a claw- ed 
like appendage. Fore wings long, narrow, pointed,  xeterothrips ariseme, 
Wetn two Jongitudimal veins, separate: for their ‘emale. a, lett anten- 
entire length, and set with from 20 to 24 stout ses tarsus, out- 
spines; costa similarly armed with stout spines which aye Oe Pee: 
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