BAGNALL'S THVSANOPTERA 125 



Karny's figure and description of phasgonura from Spanish Guinea that there can be 

 little doubt as to the generic synonymy. The genus is close to Holurothrips, which 

 is also based on specimens from leaf litter, but it can be recognized by the completely 

 setose tube and may be defined as follows : 



Head broadest across eyes, narrowed basally, weakly extended in front of eyes ; no major 

 interocellar setae, one pair of postocellars and one pair of very long postocular setae ; cheeks 

 with two pairs of stout major setae on tubercles. Antennae eight-segmented, X" III weakly 

 narrowed basally ; I with two stout dorsal setae, II with one dorsal seta extending almost to 

 apex of III ; two sense cones on both III and IV. Pronotum transverse, epimeral sutures 

 complete, antero-angular seta close to midlatcral. Pelta broad, abdominal tergites with two 

 pairs of wing retaining setae, the anterior pair short and straight ; tube narrowed apically, 

 densely clad with setae which are as long as the width of the tube. 



Hystricothrips africanus (Bagnall) comb. n. 



Zeugmatothripoides africanus Bagnall, lo.'od : 72-73. 



Accessory cilia cannot be observed on the fore wings of the unique holotype as 

 these are folded, extending to the posterior margin of tergite VI. The only other two 

 specimens known are brachypterous and micropterous and hence would not be 

 expected to bear accessory fore wing cilia. //. phasgonura Karny was described 

 as having twenty three accessor) - cilia and the body colour was given as dark brown, 

 whereas the africanus specimens are yellow with brown markings. From the gut 

 contents it is evident that the species feeds on spores, and the two specimens referred 

 to above were taken on Cola leaf litter at Ibadan, Nigeria. The larvae bear 

 numerous very long capitate setae and there is a long seta on antenna! Ill extending 

 to the apex of the antenna. 



Holotype $. Sierra Leone : Njala, Cola, 17.viii.1928 (E. Hargreaves). 



IDOLOTHRIPS Haliday 



Idolothrips Haliday in Walker, 1852 : 1096. Type-species I. spectrum Haliday, designated by 



Froggatt, 1904. 

 Idolothrips Haliday ; Froggatt, 1904 : 54-57. 



Acanthinothrips Bagnall, 1908c : 207. Type-species /. spectrum Hal., by monotypy. 

 Idolothrips Haliday ; Bagnall, 1916b : 404. 



Comparisons with Idolothrips can be found under Elaphrothrips and Meiothrips. 

 Most of the species originally assigned to Idolothrips have been removed to Elaphro- 

 thrips, and the present author has not examined any species that can be placed in 

 Idolothrips other than the type, spectrum, and its synonyms from Australia. The 

 genus may be defined briefly as follows : 



Head long, weakly constricted medially and projecting slightly in front of eyes ; dorsal 

 surface transversely striate ; two pairs of postocular setae, one behind the other ; cheeks with 

 about twelve pairs of stout pale setae ; inter- and postocellar setae stout ; maxillary stylets 

 broad, V-shaped, low in head ; antennae long. Pronotum transverse, sculptured, epimeral 

 suture incomplete posteriorly ; all major setae well developed, antero-angular close to midlateral, 

 two pairs of major epimeral setae. Praepectus present, large but weakly sclerotized, meso- 



