24. Thysanoptera from Juan Fernandez and Easter Island. 



By 

 OLOF AHLBERG. 



Witli 2 text figures. 



Among the insects collected by the Swedish Pacific Exp. 1916— 17 there 

 were some species of Thysanoptera from Juan Fernandez (Masatierra) and 

 Easter Island. As these islands are almost as good as unexplored by the 

 entomologists, these species are of considerable interest. 



Of the five species found, two species and one variety are new to science, 

 whilst the two already previously known forms are interesting from an entomo- 

 geographical point of view. 



This collection, including the type-specimens, is in the possession of the 

 Swedish State Museum of Natural History. 



The five species are as follows: 



Aeolothrips fasciatus L. 



One female specimen from Masatierra, found in the spathe of Zante- 

 deschia aethiopica. The occurrence of this species in the neotropical region, 

 from which it is now for the first time recorded, is remarkable, as it has 

 hitherto been considered exclusively holarctic. 



Sericothrips ineptus n. sp. — Fig. i. 



Female: Body quite wingless, short and square; abdomen very wide; 

 colour darkbrown; total length 1,10 mm (fig. i a). 



Head wider than long (9:6); front of head, seen from above, broadly 

 rounded, the antennae being inserted in the lower half of the convex frons, so 

 that their basal parts and the elevation between them are not visible from 

 above (fig. i b); sides of the head slightly arched; back of the head reticularly 

 transversely wrinkled, the wrinkles appearing on the sides of the head as small 

 irregular dents; bristles few and minute; dorsally i bristle immediately inward 

 from and 2 bristles posterior to each eye. Eyes somewhat protruding, irregularly 

 rounded with the posterior margin emarginated. Ocelli absent. Mouth-cone 

 bluntly pointed, reaching nearly to posterior margin of prosternum. Maxillary 



