194 NEW GENERA AND SPECIES OF THYSANOPTERA 



Diceratothrips bicornis sp. n. (PL VI., figs. 8, 9). 



Length 3-4 mm. ; breadth of mesothorax 07 mm. 



Colour uniform black, second antennal joint brownish. 



Head with anterior margin truncate, one-fifth longer than 

 broad and one-fifth longer than the prothorax. Cheeks 

 straight and practically parallel, set with a few small, slender 

 spines which are not mounted on tubercles; surface finely 

 (and apparently cross-) striate, shining. Eyes small and com- 

 paratively finely faceted ; space between them twice the width 

 of one of them; post-ocular spines long. Ocelli comparatively 

 large; posterior pair set on a line with centre of eyes and 

 close to their margins ; anterior one set in centre of forehead, 

 looking forward and protected by a pair of forwardly directed 

 and rather long spines set close to the apical margins of eyes. 

 Antennce. separated at base ; inserted under vertex and twice 

 the length of head. First joint concealed at base, cylindrical ; 

 second elongate, narrowed at base ; three to five claviform ; 

 six to eight fusiform. Third joint three times the length of 

 the second; fourth five-sixths of third; fifth four-fifths of 

 fourth ; sixth about three-quarters of fifth and of the two 

 apical joints together; apical joint short and pointed, one- 

 third the length of penultimate. Sense-cones not long ; acute 

 and light coloured ; hairs dark. 



Prothorax nearly twice as broad at base as long; broadly 

 widened from anterior margin to basal third, and from thence 

 more or less parallel. Spines at posterior angles very long and 

 set in tubercles; posterior-marginal spines and those at anterior 

 angles short. Surface finely reticulate, raised to posterior 

 edge, with a transverse depression at base, and a deep trans- 

 verse discal channel or cicatrix in the form of a low broad w. 

 Fore-coxa with one conspicuous spine ; fore-femora set with a 

 few short and rather stout spines on the inner and outer 

 edges, and two or three long and slender ones on outer edge ; 

 fore-tibia with short slender spines and one very long bristle 

 just below knee ; each fore-tarsus armed with a small tooth. 

 Hind and intermediate legs rather long and comparatively 

 slender, armed with short slender spines, as well as longer ones 



