Mr. R. S. Bagnall on neto Thysanoptera. 293 



yellowish-brown to yellowish-white at tips; intermediate 

 (and usually bind) tibiae yellowish-white at tips. Fore-wings 

 and cilia smoky yellowish-brown, lighter at base. Eyes 

 coarsely facetted, pilose. Relative lengths of antenna! joints 

 3 to 8 as follows : — 20 (with stem) : 20 : 16 : 21 : 4*5 : 7'5. 

 Third broader than any of the succeeding joints ; fifth and 

 sixth rather slender. Prothoracic bristles at posterior angles 

 0'65 the length of the prothorax. Legs sparingly clothed with 

 seta?. Upper vein of fore-wing with 3 + 3 spines in the 

 basal half near base, and only two spines in the distal half, 

 together near tip. Apical abdominal spines long. 



c? . — Length TO to l'l mm., and more slender than $ . 



Each of the sternites 3 to 7 with a strongly transverse 

 pale depression near upper margin *, and numerous, more or 

 less small, irregular (but inclined to be roundish) areas of a 

 similar nature placed irregularly over the whole of the surface. 

 Ninth tergite with four short, stout, dorsal spines in the form 

 of an obverse arc, inner pair more apical and shorter than 

 the outer pair. Colour lighter ; third antennal joint yellowish- 

 white and joints 4 to 6 also yellowish-white in their basal 

 halves. 



Hob. Africa : on rubber-trees (Funtumia elastica), Uganda 

 and Southern Nigeria (from several correspondents). 



Physothrips usitatus, sp. n. 



? . — Length 1*6 mm. 



Near P. sjostedti (Tryb.). Colour brown, third antennal 

 joint yellowish-brown to greyish-yellow ; fore-femora (in 

 sjostedti dark) yellow, lightly tinged with brown, especially 

 on the outer margin ; fore-tibise, all tarsi, and intermediate 

 and hind-tibiae, at extreme apices yellow. Fore-wing lightly 

 tinged with brown at extreme base ; clear to basal third and 

 thence brown to apex, with a lighter patch just before apex ; 

 mid-vein of hind-wing extending to apex, brown; all spines 

 and cilia dark. Head almost as long as broad and not quite 

 as long as prothorax. Interocular bristles long. Antennas 

 2 - 5 times as long as the head ; relative lengths of joints : — 

 13 : 15 : 23 : 23 : 14 : 21 : 6 : 8. Double trichomes on joints 

 3 and 4 long and stout. Middle joint of maxillary palpi the 

 shortest. Upper vein of fore-wing with three basal bristles, 

 a series of 11 (10-13) commencing at about the first fourth 

 and running to, or just into, the distal third, and 2 at extreme 

 apex ; lower vein with series of 13 (12-15) bristles com- 



* These maybe broken up into a line of smaller aVprp-«ir>ns. 

 Ann. c£- Mag. N. Hist. Ser. S. Vol. xii. 21 



