686 FAUNA HAWAHENSIS 



to base of tube. Tube not quite twice as broad at base as tip, and two and one-half 

 times as long as broad at base, about five-sixths the length of head ; terminal bristles 

 weak, about two-thirds the length of tube. Abdominal bristles short and weak, those 

 at apex of ninth segment about half the length of tube ; a longer and stronger dorsal 

 bristle near each posterior angle of each of the segments two to seven. The dorsal 

 surface is in parts weakly raised in irregular and broken longitudinal ridges. 



<T. The male has the prothorax larger and more roundly raised than in the female, 

 the fore-legs much more strongly incrassate ; the fore-tibia comparatively shorter and 

 stouter and the fore-tarsus armed with a very strong tooth. 



The abdomen is a little narrower and the ventral side of the ninth abdominal 

 segment is armed with a pair of short spines. 



Forma uiacroptera. 



There is a single carded specimen of the winged form in Dr Perkins' collection. 

 The pterothorax is well-developed and the wings are long, reaching beyond the tip of 

 tube, smoky coloured and darkly shaded towards the end. 



Hab. Maui. — Forma aptera : several specimens including larvae and pupae in 

 alcohol, no date (Perkins); Haleakala (mountain), numerous specimens from under bark, 

 above 5000 ft., April 1894 (Perkins, No. 116); Forma mac7-optera: one female, 

 Haleakala at 5000 ft., October 1896 (No. 661). 



(3) Dolerothrips ovatus, sp. now 



Plate XVIII. figs. 1—6. 



Z- Length i "9 to 2-0 mm., breadth of mesothorax o'5 mm. 



Colour dark chestnut-brown, fore-tibiae reddish-brown and all tarsi lighter with 

 base of sixth, basal third of fifth and fourth, and the greater part of third joint yellowish. 



Head not quite seven-eighths as broad behind eyes as long; sides sub-parallel then 

 sharply constricted at base ; set with a few small spines ; frons slightly raised ; surface 

 striated transversely. Eyes moderately small and not very finely faceted, occupying 

 laterally about one-fourth the length of head; post-ocular bristles long and set well back. 

 Ocelli moderate in size, anterior ocellus at apex of raised part and the posterior pair on 

 a line drawn through centre of eyes and not quite touching their inner margins. 

 Mouth-cone about three-quarters as long as broad at base, broadly rounded at the tip 

 and scarcely reaching one-half way across the prosternum. 



Antennae twice as long as the head, joints three and four clavate ; fifth constricted 

 at basal third, subclavate ; sixth constricted near base and with the seventh and eighth 

 submoniliform, the apical joint being abruptly constricted at apex. A pair of sense- 

 cones on each of the joints three to six. 



