from the Seychelles Islands and Rodrigues. 283 
The head is longer in J. rea than in D. stenocephalus 
(13: 11-5), and the tube the same length in the two species, 
and therefore shorter in comparison with the head in D. rea. 
Loc. StycHe ites. Silhouette: Mare aux Cochons, 6. ix. 
1908, 13. 
21. Dicaiothrips mahensis, sp. n. 
(Pl. VII. fig. 9.) 
6 .—Length 5°5 to 6-0 mm. 
Colour dark chestnut-brown to black-brown; fore-tarsi 
yellowish-brown. Wings faintly tinged with sulphurous 
yellow and cilia fumate. Antennal joint 3 light lemon- 
yellow with a narrow dark brown ring at extreme apex; 4 
also yellow with distal third brown and a very narrow ring 
of brown at extreme base; 5 with basal half or thereabouts 
yellow and the apical half brown ; 1 and 6-8 dark black- 
brown and 2 brown to yellowish-brown distally. Sickle- 
shaped spine of fore-femur yellow and abdominal bristles 
light-coloured. 
Head approximately 2°7 to 3:0 times as long as broad at 
base ; eyes occupying 0°2 and the produced part about 0°12 
the total length. Postocular bristles set well back, rather 
long, anteocular pair moderately long. Genal spines, ex- 
cepting for the pair behind the eyes short and more or less 
subequal. Antenne 1°5 times the length of the head, 
slender; relative lengths of joints 3-8 approximately :— 
47 :40:34:21:14:18. Sense-trichomes moderately long, 
slender, colourless, on segments 3 to 5, and a short stout one 
on inner side of 6; of the protective bristles one on the 
outer side of each of the segments 38 to 5 is noticeably long. 
Pronotum 0°4 the length of the head and 1:7 times as 
broad as long. Setz of posterior margin prominent, the 
outer pair longer than the inner and approximately 0°6 the 
median length of the pronotum; mid-lateral and antero- 
marginal pairs apparently minute. Fore-coxe prominent, 
produced to form a seat for the coxal setz ; fore-femora 
very strongly incrassate and armed with several stout spines 
on the outer margin of the basal third or thereabouts ; fore- 
tibia stout, distal inner angle produced ; fore-tarsus with a 
long stout tooth. Pterothorax broader than the width 
across fore-coxz, broadest in the region of the suture of 
meta- and mesothorax. Wings closely ciliated, with 45:48 
duplicated cilia in one specimen and 50:54 in another. 
Abdomen gradually narrowing from base, where it is 
