678 FAUNA HAWAIIENSIS 



Head large, longer than broad and nearly twice as long as the prothorax ; cheeks 

 parallel, roundly constricted at base. Antennae one and one-half times the length of 

 the head, joints six to eight closely segmented. Mouth-cone rounded at tip, almost as 

 long as the presternum. Eyes small ; ocelli absent in wingless forms, present but very 

 small in winged forms ; post-ocular spines absent. 



Prothorax small, transverse ; pterothorax transverse. Wings, when present, long 

 and slender ; fore-wing with a strong median vein the basal half of which is transversely 

 ridged. Fore-coxa without a prominent spine, fore-tarsus unarmed in the female. 



Abdomen elongate-ovate, much broader than the pterothorax ; all bristles 

 (excepting those at tip of tube) obsolete. 



Male one-third smaller than the female, having the abdomen more slender and 

 distinctly linear, the fore-leg stouter and the fore-tarsus armed with a tooth. 



Species small. 



Type. Dermoikrips hawaiiensis mihi. 



(i) Dermothrips hawaiiensis, sp. nov. 



Forma aptera. 



Plate XVII. figs. 1—5. 



%. Length 2'o mm., breadth of mesothorax o"43 mm. 



Colour uniform dull black, tarsi tinged with brown. 



Head one and one-third times as long as broad and not quite twice as long as the 

 prothorax ; cheeks sub-parallel and rounded near base ; vertex slightly raised between 

 eyes. Eyes coarsely faceted, small, occupying laterally a little more than one-fifth the 

 total length of the head ; yellowish-brown in the dried specimens. Ocelli and post- 

 ocular spines absent. Width between the eyes a little more than two and one-half times 

 the width of an eye. Antennae one and one-half times the length of the head, 

 separated at their bases and inserted on a raised prominence ; second joint distally 

 truncate, third to fifth clavate and sixth to eighth closely segmented ; third joint one 

 and one-half times the length of second ; fourth, four-fifths of third; fifth, seven-eighths 

 of fourth ; sixth equal in length to the fifth, constricted at base and truncate at apex ; 

 seventh less than half the length of the sixth, and apical joint three-quarters the length 

 of the seventh, the three apical joints together narrowing from about middle to tip. 

 Sense-cones long and slender, a pair on each of the joints three to five, but apparently 

 only one on the sixth joint, which is on the inner side of tip. In some specimens there 

 appears also to be a long, slender sense-cone on the seventh joint at the tip within. 

 Mouth-cone rounded at tip, three-quarters as long as wide at base and not quite 

 reaching across the presternum ; labrum pointed. Surface of head scabrous, the 

 irregular ridges most conspicuous laterally and taking the form of numerous small 

 tubercles, each set with a weak and minute seta. 



