248 THE ENTOMOLOGIST. 



each side of the eighth segment (fig. 1, a). I find that there are 

 also distinct vestiges of these processes present in the female 

 (fig. 1, b). They are, in both sexes, immediately in front of the 

 spiracle of the eighth segment. No such organs occur, so far as 

 I know, in any other species of the suborder Terebrantia, but 

 something similar is found in some genera of the Tubulifera. 

 Thus in Megathrips nohilis (Bagnall, Ent. Mon. Mag. xx. 1909, 

 p. 131) there are lateral processes on the sixth and eighth 

 abdominal segments. This feature would alone almost justify 

 the separation of rohusta from the genus, but I find further that 

 in this species the two long ocellar spines are between the two 

 posterior ocelli (fig. 1, c), whereas in all the other species of 

 Frankliniella which I have been able to see, or in the descrip- 

 tions of which these spines are mentioned or figured, they are 

 between the posterior and anterior ocelli (fig. 1, d).* 



Further, the larva of rohusta has the last two abdominal 

 segments dark- coloured, a feature more characteristic of the 

 larvae of the Tubulifera, and which does not occur in the larvae 

 of any of the species of Frankliniella that I have observed. 



On the above grounds I am removing rohusta from the genus 

 Frankliniella, and propose the name Kakothrips for a new genus 

 to contain it, characterised as follows : — 



Kakothrips, new genus. 



= Physopus, Uzel (/. c), in part. 



= Frankliniella, Karny (Mitt. Nat. Ver. Univ. Wien, viii. 

 1910, p. 45), in part. 



Antennae eight segmented. One long spine at each front angle, 

 and two at each hind angle of the prothorax. Ocellar spines betioeen 

 the two posterior ocelli. Maxillary palps three jointed, labial palps 

 two jointed. Fore vein of the upper wing set regularly throughout 

 its whole length with short spines. Lateral processes on each side of 

 the eighth abdominal segvient in the male curving backioards and 

 upivards, in the female rudimentary but distinguishable. Larva with 

 ninth and tenth abdominal segments dark. 



Type (and at present only species), K. rohustus. 



The characters in italics distinguish it from Frankliniella. 



Fuller particulars of the species itself will be given as 

 mentioned above. 



* They are certainly in this position in the following species : — intonsa 

 (Trybom) (= vidgatissinius, Uzel) ; tenuicornis (Uzel) ; melanommata, 

 Williams ; fusca (Hinds) ; stylosa (Hood) ; tritici (Pergande) ; insularis 

 (Franklin) ; helianthi (Moulton) ; occidentalis (Pergande, teste Hinds) ; 

 cephalica (Crawford) ; nervosus (Uzel. teste Hinds) ; floridensis (Morgan) ; 

 runneri (Morgan); gossypii (Morgan). But sulpJmrea, Schmutz, would 

 appear from the description to be possibly like robusta, and in minuta 

 (Moulton) they are small or absent. 



The John Innes Horticultural Institution, 

 Merton, Surrey : July, 1914. 



