66 RICHARD S. BAGNALL. 



2. Antennae brown (exhibiting sexual dimorphism in colour). Head and prothorax 

 longer, with longer interocellar and pronotal bristles, those at posterior angles 

 of prothorax being subequal in length. Size larger. On rubber (Funtumia 



elastica) P.funtumiae 



Antennae with segment 3 greyish yellow, similar in colour and structure in both 

 sexes. Interocellar and pronotal bristles shorter, the inner of those at posterior 

 angles of prothorax being distinctly longer than the outer. Size smaller. On 

 various plants P. marshalli. 



Table of Males. 



1. Fore- wings uniform brown. Antennae with segment 6 not abnormally developed. 



Colour not wholly brown . . . . . . . . . . . . . . . . 2 



Fore-wings white basally, insect otherwise wholly brown. Segment 6 of antennae 

 exceptionally large, more than twice as long as 5, and four times as long as 

 the style (7 +8) P. kellyanus. 



2. Antennae not coloured as in $, intermediate segments varicoloured. Abdominal 



segments less transverse, with the depressions in sternites 3-7 roughly approxi- 

 mating 4 (sometimes 3) transverse rows, and usually having a longish trans- 

 verse area, more or less median, in the first row (fig. 2 b). Specialised setae on 

 tergite 9 as in fig. 2 c, stout . . . . . . . . . . P. funtumiae. 



Antennae as in $. Abdominal segments more strongly transverse, with the 

 depressions in sternites 3-7 arranged in 2 rows and without any transverse 

 area (fig. 1 b). Specialised setae on tergite 9 as in fig. 1 c, weak P. marshalli. 



Physothrips marshalli, sp. nov. (fig. 1). 



$. Length, about l'l mm. 



Colour brown ; antenna with the two basal joints brown, joint 3 yellow and 4 

 to 8 yellowish brown, with extreme bases of 4 and 5 lighter. All tarsi and fore tibiae 

 yellowish, the latter shaded to greyish brown laterally. Fore-wings uniform brown ; 

 hind-wings, excepting median vein, lighter. 



Head approximately 1"5 times as broad as long; cheeks subparallel, scarcely 

 arched ; eyes moderately coarsely facetted, setose, space between them equal to the 

 breadth of an eye ; ocelli placed well back, the posterior pair approximating the 

 interior margin of the eyes at about their posterior fourth ; inter-ocellar bristles only 

 moderately long, about as long as the breadth of an eye. Other dorsal and lateral 

 setae minute. 



Antennae approximate at base, at least 2 "6 times as long as the head ; form and 

 structure as in fig. 1 d, segment 4 being slightly longer than 3. Long forked trichomas 

 on 3 and 4. 



Prothorax but slightly longer than the head, about l - 7 times as broad as long ; 

 the two bristles at posterior angles rather stout and long, the inner being 0'6 the 

 length of the prothorax and distinctly longer than the outer. Pterothorax broader 

 than the prothorax (1"25 : 1), as long as or slightly longer than broad. Fore- wings 15 

 to 16 times as long as broad at middle, curved (i.e., sword-shaped) ; costa with about 

 27 setae ; upper vein with a series of 3 +5 setae in the basal two-fifths or thereabouts 



