Rood — New Genera and Species of X. A. Thysanoptera. 73 



in other secluded places, the ocelli arc lacking in apterous or brachypter- 

 ous generations and present in macropterous ones; while in the genera 

 which constitute the main hulk of the family and whose species do not 

 spend their lives in hidden places, the ocelli are always, and the wings 

 usually, present. It is interesting to note, however, that the reduction of 

 the eyes and the absence of ocelli can not always he ascribed to a decrease 

 in the light intensity, for this wingless species has no ocelli, yet lives 

 exposed to the rays of a tropical sun on the leaves of an intensely xerophil- 

 OUS plant. 



Rhopalothrips bicolor sp. now 



Plate IV, second figure; fig. 5, a and b. 



Female : forma brachyptera. — Length about .9mm. Head, prothorax, 

 meso- and metanotum black; abdomen and metapleurae white, segments 

 2-8 of the former each with a pair of small granulate black dots on dor- 

 sum : legs white, the tibiae of second and third pairs handed with black, 

 anterior and middle femora black 

 at base; antenna' white, segments 



4 and 6-8 dusky, the last two espe- 

 cially so. ( By transmitted light the 

 heavy white pigment often appears 

 nearly black, in some specimens 

 almost reversing the coloration as 

 described above.) Dorsal surface 

 non-sinning, densely granulate in 

 dark colored portions, the granules 

 tending to coalesce into lines of re- 

 ticulation; ventral surface smooth. 



Head slightly wider than long, 

 widest in basal third and narrowed 

 toward eyes, with a median carina 

 above insertion of antenna'; dorsal 

 and lateral surf aces sparsely spinbse 

 with brief, transparent, pointed 

 spines; postocellar bristles large, 

 dilated ; asecond pair of prominent 

 bristle-insertions visible at inner 



posterior angle of eyes; postocular hristles wanting. Eyes with coarse, 

 separated facets, between which are minute, stout spines. Ocelli wanting. 

 Antenna' short, stout, about twice as long as head ; segments 1, 2, 3, and 



5 nearly white; 1 and ") slightly darkened with yellowish; 4 and (i dusky 

 brown, the former paler at apex, the latter paler at base; 7 and 8 uniform 

 blackish brown; segment 2 subglobose, pedicellate, conspicuously the 

 broadest in entire antenna; :; short, slender, claviform, conspicuously 

 narrower and weaker than 4 ; 4 and 5 clavate, pedicellate; 6-8 successively 

 shorter, together forming a compact, pedicellate club; sense cones and 

 spines exceedingly small and weak; segment 2 with a broad, infundibuli- 

 form hristle on inner side of dorsum; segment I! without sense cones. 



Fig. 5. 



Rhopalothrips bicolor gen. et sp. now 



Female; a, head and prothorax, xy:!; 



h, right antenna, x206. 



