KNOWLEDGE OF THE NEOTROPICAL THYSANOPTERA. 379 



hairs on tibise strong and fore-tarsal tooth well developed ; intermediate and 

 posterior legs slender, with the femora slightly swollen at their distal thirds. 

 Pterothorax wider than the width across fore-coxse, with sides of metathorax 

 roundly narrowed to base of abdomen. Wings reachiiig to the fifth abdominal 

 segment, hyaline^ with median veins and cilise brown. 



Abdomen gradually narrowing to tube, long and slender^ with the segments 

 elongate ; seventh segment nearly twice as long as the eighth. Tube short 

 and broad, scarcely four times as long as broad near base, a little more than 

 two-thirds the length of head and slightly shorter than the seventh segment ; 

 terminal hairs not quite so long as the tube. Abdominal bristles long and 

 moderately slender, those on the ninth segment longer than tube and reaching 

 to the tip. 



Type. One male in coll. Godman and Salvin. 



Habitat. Chontales, Nicaragua (Janson). 



D. distinctus may be easily recognized by the form of the head, which is 

 less produced beyond the eyes than in any of the other species, excepting 

 brevicornis, and by the shortness of the eighth abdominal segment and of 

 the tube. 



The characters given in the table readily separate distinctus and brevicornis. 



DiGAIOTHRIPB BREVICORNIS, Sp. nOV. (PI. 51. llg. 9 ; PI. 52. fig. 8.) 



$ . Length 5"0 mm., breadth of mesothorax 0"G2 mm. 



Colour dark chestnut-brown ; fore-tibias and all tarsi reddish brown ; 

 second and base of sixth antenna! joints tinged with yellow, 2 to 5 

 yellow, third slightly tipped^ and the apical third of fourth and half of fifth 

 shaded with bi'own. 



Head two and one-third times as long as broad, and two and one-quarter 

 times as long as the prothorax ; shaped as in D. distinctus, with the vertex 

 raised and only slightly produced beyond the eyes. Cheeks sparsely set with 

 short spines. Eyes large and finely facetted, occupying laterally a little less 

 than one-third the total length of the head. Ocelli moderately large, posterior 

 pair above a line drawn through centre of eyes ; post-ocular bristles long. 

 Antennae one and two-thirds the length of head ; fourth joint three-quarters 

 of third, fifth five-sixths of fourth ; joints 3 to 5 claviform and 6 to 

 8 fusiform. A pair of sense-cones on each of the joints 3 to 5, but 

 apparently only a single cone on the inner side of joint 6. Mouth-cone 

 blunt, and reaching more than halfway across presternum. 



Prothorax with the bristle at each posterior angle long and strong. Ptero- 

 thorax only slightly broader than long ; sides of metathorax slightly rounded 

 and furnished with a strong sub-lateral spine near each posterior angle. Legs- 

 moderately long ; fore-femur slightly incrassate, with a few long bristles on 



