THYSANOPTERA 687 



Prothorax convex, very slightly longer than the head and about two-thirds as long 

 as broad, surface smooth ; mid-lateral and posterior-marginal spines and pair at 

 posterior angles present, long and practically sub-equal. Pterothorax almost as broad 

 as the width across fore-coxae and only about one-third as long as broad. Wings 

 vestigial. Legs moderately long and stout, posterior coxa large and armed with a 

 number of short, stout spines ; fore-femur much swollen, smooth ; tibia stout and tarsus 

 armed with a strong tooth. 



Abdomen broadly ovate, broadening to the fourth segment and thence roundly 

 narrowmg to the base of tube. Basal half of each segment excepting the ninth and 

 tenth roughened with a fine reticulated sculpture. A single pair of very weak wing- 

 retaining spines on each of the segments two to eight, and near the apical margin. 

 Tube a little more than two-thirds the length of head, nearly twice as broad at base 

 as at tip and narrowing evenly to apex. Terminal hairs about three-quarters die length 

 of tube, and bristles at the apex of the ninth segment about the same length. 

 Abdominal bristles long and moderately strong. 



$. The female differs from the male in having a shorter, narrower and flatter 

 prothorax. The fore-femur is only slightly incrassate, the tarsus is armed with a 

 smaller tooth ; the fore-coxa is small and is only armed with a few short spines, one of 

 which is distinctly longer than the others, whilst the abdomen is decidedly broader, 

 being one and one-third as broad as the width across the fore-coxae. The tube is five- 

 sixths the length of the head and not so slender as in the male. 



Forma macroptera. 



As in D. flavipes ; one specimen has the wings stretching beyond tip of tube 

 and the other only to the base of the tube. The wings are faintly iridescent with an 

 obscure sulphur patch near base. 



Hab. Maui; Haleakala, one male and two females at 9000 ft., April 11, 1894 

 (Perkins, No. 124), and two brachypterous and two macropterous females at 5000 ft., 

 September 1896 (No. 661). 



(4) Dolerothrips perkinsi, sp. nov. 



Plate XIX. figs. 17 — 20. 



$. Length r8 mm., breadth of mesothorax 0*43 mm. 



Colour very dark brown, almost black ; fore-tibiae dark chestnut-brown and all tarsi 

 brownish ; antennae dark brown with the basal part of the third joint only yellowish. 



Like D. ovatus but not so broad ; has the head longer and the prothorax com- 

 paratively shorter, whilst the antennae, which have the joints three to six distinctly 

 claviform, are only one and two-thirds the length of the head. The abdomen approaches 

 that of D. lanaiensis in form, but has the bristles as in D. ovatus, though shorter and 



88—2 



