Mr. R. S. Bagnall on new Thysanoptera. 257 



breadth of the wing, unicolorous. Hub, 



Gold Coast T. roboris, sp. n. 



Head and protkorax not so strongly trans- 

 verse 2. 



2. Spines of the fore-wing- bicolorous, 1'3 times 

 as long - as the breadth of the wing. Hah. 

 Ceylon T. rutherfordi (Bagn.). 



Spines of the fore-wing unicolorous, only 

 0*7 as long as the breadth of the wing. 

 Hah. Seychelles T. brevisetis, Bagn. 



Tryphactothrips roboris, sp. n. 



$ . — Length c. 1/2 mm. 



Brown, sides of prothorax and" the greater part o£ the first 

 eight abdominal segments, chiefly laterally, of a very deep 

 black-brown ; hind and intermediate femora and the fore-tibia? 

 greyish-yellow shaded with brown ; tibiae yellowish shaded 

 with grey to greyish-brown. Antennal joints 3-8 lost in the 

 type, basal joints yellowish. Fore-wings yellowish-brown, 

 darker on the veins, but with light or clear area in the basal 

 fifth, about the fourth fifth, and at extreme tip. 



Head strongly transverse, fully twice as long as broad, 

 very markedly constricted at neck ; genal and frontal ex- 

 planate margins much narrower than in T. rutherfordi ; 

 ocelli on a raised prominence, large and well separated from 

 the eyes ; the front one forwardly directed. The reticulated 

 surface with a crescentic series of eleven large reticulations 

 behind, in the arc of which the reticulations are smaller and 

 more regular than laterally and between the eyes above the 

 aic. Pronotum twice as broad as long medianly (where it is 

 the longest on account of both anterior and posterior margins 

 being arcuate), and nearly three times as broad as the length 

 at sides. Surface furnished with some setse, of which a mid- 

 lateral and postero-niedian pair are fairly prominent, being 

 about 0'23 the median length of pronotum ; they are acumi- 

 nate, slightly curved, and apparently stouter in the basal 

 third than at base. Prothorax, legs, wings, and abdomen 

 much as in T. rutherfordi. Fore-wings broad in the basal 

 third or thereabouts, thence narrow and parallel to near tip ; 

 upper vein with two spines near union with lower vein, the 

 second being lighter and not so strong; a space and then a 

 series of five (2 + 2 + 1) ; the first two being in the light area 

 are less strong and lighter than the next two, which are 

 situated on the dark patch before apex, whilst the most distal 

 one is much weaker and nearly colourless ; lower vein with 2 

 near base, then 1 + 4, the single one coming well before the 

 series of five in the upper vein, and the first of the four 



