SOME NEW AND LITTLE-KNOWN EXOTIC THYSANOPTERA 53 1 



$. The male has the fore-femur strongly incrassate, and the 

 tibia and tarsal tooth stout. 



Type. — In coll. Bagnall. 



Habitat. — This species is very numerously represented in 

 the collection from the Isle of Nias (K. Jordan), and we find 

 pleasure in naming it in Dr. Jordan's honour. 



We may add that we are not yet perfectly familiar with the 

 limitations of certain European genera, and it is therefore with 

 some hesitation that we refer this form to the genus Zygothrips 

 Uzel. It should also be noted that the specimen figured in 

 the plate is a very small one. 



Genus PLECTROTHRIPS Hood, 1908 



Plectrothrips collaris sp. n. (PL xiv., figs. 11-14). 



$. Length i"85 mm.; breadth of mesothorax 0*4 mm. 



Colour uniform reddish brown, tibiae lighter, and all tarsi 

 yellowish brown. Antennas with the third joint also lighter. 



Head about seven-eighths as wide at base as long, and 

 about four-fifths as long as prothorax; truncate in front, 

 widest behind eyes, from whence it is narrowed slightly to 

 base; post-ocular bristles as in P. antennatiis Hood*, namely, 

 near the lateral margins and midway between the posterior 

 margin of eyes and the anterior margin of prothorax. Eyes 

 large, occupying more than one-third the length of head ; 

 facets moderately fine; anterior ocellus presumably at the 

 extreme vertex of head and overhanging ; posterior pair 

 widely separated, large and placed on a line drawn through 

 the anterior third of eyes and contiguous with them. Antennae 

 inserted beneath the vertex, twice as long as broad ; the joints 

 tw^o to eight almost subequal ; two to six roughly obconical, 

 seventh oblong and constricted near base, and the eighth 

 fusiform or narrowly pyriform. A pair of moderately long 

 and stout sense-cones on joints three, four, and five, and a 

 single cone on the inner side of the sixth antennal joint. 



* Bulletin of the lUinois State Laboratory of Natural History, Yiii., Art II., 

 p. 370, AugTist, 1908. 



