THE EUBBER THRIPS AND ITS ALLIES. 



67 



and then 2 in the distal seventh ; lower vein with a series of 16 to 20 similar setae ; all 

 setae not stout and somewhat short. Upper cilia sparing, rather long ; lower cilia 

 close, not exceptionally long, minutely wavy. Legs of normal form. 



Abdomen of usual form ; posterior margin of tergite 8 with a moderately long 

 fringe of microscopic hairs ; tergite 9 with a widely spaced pair of dorsal bristles ; 

 bristles at posterior angles of segment 8 incurved. Apical bristles moderately strong, 

 long, the longest pair being as long as the length of segments 9 and 10 together. 





Fig. 1. Physothrips marshall, Bagn., sp. n. 



a, head and prothorax of $, X c.135 



b, sternite 6 of (J showing areas, X c.135 



c, arrangement of special setae on tergite 

 9 of (J, X c . 200 ; d, antennal segments 3 



to 8 of $, X c.200. 



Measurements, approximately : — 



Head, length 0'105 mm., width 0152 mm. ; interocellar bristles 0'046 mm. long ; 



pronotum, length 0"115 mm., width 0'195 mm. ; pterothorax, length 0'27 mm., 



width 0'25 mm. ; fore-wing, length - 68 ; width near middle 0"044 mm., at base 



0"064 mm. ; abdomen, width at segment 5, 0'3 mm. ; length of tergite 5, 0'076 mm. 



Antennal segments . . . . i ii iii 



length (ft) 26 34 49 



width (ft) 31 26 22 



Total length of antenna, - 282 mm. 



<J. Length, about 0'8 mm. Colour and structure much the same as in the $. 

 Abdominal sternites 3 to 7 with two more or less regular transverse series of irregular 

 roundish pale depressions. Antennae much as in $. 



Measurements of antennal segments approximately as follows : — 



Segments . . . . . . i ii iii iv v vi vii viii 



length (ft) 23 30 43 45 34 47 8 12 



width (ft) 24 23 17 16 15 15 6 4 



(C455) e2 



IV 



V 



VI 



vu 



vm 



54 



38 



55 



10 



16 



19 



16 



17 



6 



5 



