24. Thysanoptera from Juan Fernandez and Easter Island. 
By 
OLOF AHLBERG. 
With 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 coilection, 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 MJasatzerra, found in the spathe of Zavnte- 
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 I,ro 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 1 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 
