THYSANOPTERA 691 



bristles, as well as the post-ocular spines are even less strongly developed. The bristles 

 at the apex of the ninth abdominal segment are about one-third the length of tube 

 which latter is two-thirds the length of the head and stouter than in the male. 



Hab. Molokai, Lanai, Hawaii. — Lanai, six males and six females, 2000 feet, 

 January 1894 (Perkins, No. 91); one female, 2000 feet, December 1893 (No. 92), and 

 one female above Waipaa about 3000 feet, February 1894 (No. 102). — Hawaii, one 

 male, Kona, 3000 feet, September 1892. — Molokai, Kalae, one male and one female, 

 August 7th, 1893 (No. 172) and one female, Molokai Mountains, August 29th, 1893. 



(9) Dolerothrips dnbiiis, sp. nov. 

 Plate XIX. figs. 23 — 27. 



Forma inacroptcra. 



?. Length 2'o mm., breadth of mesothorax 0*48 mm. 



D. capito closely approaches D. ovatits and may be separated by the form ol head 

 (fig. 23) and antennae (fig. 25) and the shorter and more slender fore-legs. The antennae 

 have the stems of each joints 3 — 5 yellow, the prothorax has a shallow fovea on each 

 side of the mid-line and is irregularly foveolate towards lateral margins, and has more 

 slender bristles than in ovatiis, the posterior-marginal pair being quite small. The 

 intermediate tibia has a lone hair at its distal third on the outside as in D. ovatits. 



O 



The wings are rather narrow and each fore-wing is tinged wholly with smoky- 

 yellow whilst the hind-wing has the lower half tinged with the same colour for the 

 whole of its length ; there are 16 or 17 double hairs in the lower fringe of upper wing 

 near tip. The tube is five-sixths the length of the head and two and one-half times as 

 long as broad at base. The abdominal bristles are not quite so well developed as in 



ovatus. 



Forma aptera. 



Wings vestigial. 



o o 



It is with reluctance that I give a name to this form — whilst it distinctly differs 

 from any of the species heretofore described it must be acknowledged that we have 

 too slight a knowledge as to the extent of variation in the species, especially as regards 



the wineed forms. 



es 



Hab. Hawaii, Lanai, Molokai. 



Yoxva-a. macroptera, % Hawaii, one, Kilauea, August 1895 (Perkins, No. 532); one, 

 Kona at 3000 feet, September 1892 (in spirit) ; Molokai, one, Molokai Mountains at 

 4500 feet, September 21st, 1893; Lanai, one at 3000 feet (No. 93) and a doubtful 

 specimen at 2000 feet (No. 89). Forma aptera, one specimen Molokai, Molokai 

 Mountains, 3000 feet, June 1893 (No. 185). 



