THE RUBBER THRIPS AND ITS ALLIES. 



69 



antennal segments 3 to 6 are pale yellowish white, 4 to 6 being light grey-brown 

 in their distal halves or thereabouts, and 7 and 8 also grey-brown. Fringe of 

 tergite 8 in $ entire, longish ; apical abdominal bristles shorter than the length of 

 segments 9 and 10 together. 

 Measurements approximately : — 



?. Head, length 0125 mm., width - 16 mm. ; interocellar bristles, length 0'065 



mm. ; pronotum, length 0'15 mm., width - 22 mm. ; pterothorax, length 0"35 mm., 



width 0"35 mm. ; fore-wing, length TO mm., width near middle 0'067, mm., at base 



- 09 mm. ; abdomen, width at segment 5, 0'37 mm., length of tergite 5, 0'095 mm. 



Antennal segments . . . . iii 



length $ (p) 63 



width $ (ju) 25 



length <J (fi) 55 



Known from Uganda and Southern Nigeria. 



Physothrips kellyanus, Bagn. (fig. 3) ; Ann. Mag. Nat. Hist. (8) xvii, 1916, p. 219. 



This species, measuring from 1*6 to 1"8 mm. in the $, was described from several 



examples collected by Mr. R. Kelly in North Queensland on a composite plant 



(? Helianthus sp.) and on a South African plant (Acokeanthera spectabilis) in the 



IV 



V 



VI 



vn 



vm 



57 



46 



61 



12 



26 



24 



18 



19 



8 



6 



51 



39 



56 



10 



18 



Fig. 3. Physothrips kellyanus, Bagn. : ra.head 

 and prothorax of $, x c.135; 6, antennal 

 segments 3 to 8 of $, X c . 200 ; c, antennal 

 segments 4 to 8 of <J, X c.200 ; d, arrange- 

 ment of special setae on tergite 9 of <$, X c . 200. 



Brisbane Botanic Gardens. Mr. KeUy also took it in Victoria, on Hypochoeris 

 radicata. It differs from the two African species, apart from its larger size, by 

 the stronger chaetotaxy of the head, prothorax, etc. ; the presence of a pair of 

 minor setae between the median posterior pair of prothoracic bristles (fig. 3 a) ; the 



