BAGNALL'S THYSANOPTERA 83 



Diceratothrips seychellensis (Bagnall) comb. n. 



Cryptothrips seychellensis Bagnall, 1921b : 274-276. 



This species and difficilis are unusual in the group in lacking a tarsal tooth in the 

 female although this is well developed in the male. The tube bears very faint 

 indications of sculpture near the base. 



LECTOTYPE 3. Seychelles : Mahe" [Cascade Estate, 1,000 ft., i-iii.1909]. 



Diceratothrips thomasseti (Bagnall) comb. n. 

 (Text-fig. 27) 



Liothrips thomasseti Bagnall, 1921b : 288-289. 

 Liothrips nigricornis Bagnall, 1921b : 278-279. Syn. n. 

 Ethirothrips madagascariensis Bagnall, 1936 : 222. Syn. n. 



Although nigricornis has page priority the present author as first reviser (Inter- 

 national Code of Nomenclature, Article 24) uses the name thomasseti as that was 

 designated type-species of Ethirothrips by Priesner. The length of the antero- 

 angular pronotal setae is 65(i. in the nigricornis specimens from Seychelles, 130a in 

 the thomasseti lectotype, but varies from 57-105(0, in four specimens from New 

 Guinea. The number of accessory fore wing cilia varies from about thirty five to 

 forty five, but the differences in head shape, pronotum and tube length appear to be 

 due to faulty preparation of the original microscope slides. The species is very 

 close to brevicornis with which it may prove to be identical. 



LECTOTYPE ?$. Rodrigues Is. : vii-ix.1918 (H. J. Snell & H. P. Thomasset). 



LECTOTYPE ?9 of nigricornis. Seychelles : Silhouette [Mare aux Cochons, 

 ix.1908]. 



Holotype $ of madagascariensis. Madagascar : Ivondro, 13.vii.1901 [Alluand). 

 Paris Museum. 



DIMORPHOTHRIPS Bagnall 



Dimorphothrips Bagnall, 1928b : 58-60. Type-species D. microchaetus, by original designation. 



Head about twice as long as broad, narrowed behind eyes ; eyes large ; first ocellus on 

 conical projection overlaying base of antennae ; without major setae ; maxillary stylets 

 slender, very low in head ; mouth cone rounded. Antennae eight segmented ; I very large ; 

 sense cones on III to VII long, 1; 3; 2; 2; 1; respectively. Pronotum broad, eroded laterally, 

 epimeral sutures complete ; epimeral setae long, the other major setae only about twice as 

 long as the minor setae ; praepectus absent, mesopraesternum broad. Mesonotum and 

 metanotum reticulate ; mesonotum eroded only at extreme apex. Fore femora expanded, 

 fore tibiae broad at apex, fore tarsi armed. Mid and hind legs stout. Fore wings with about 

 twenty accessory cilia ; basal setae short and stout. Pelta longer than broad, with elongate 

 reticulations medially. Abdomen, including tube, completely reticulate ; numerous short 

 stout setae laterally. Male sternite VIII with a continuous gland ; setae on tergite IX sexually 

 dimorphic. 



