Hood — Australian Thysanoptera. 79 



Head about 1.5 times as lonp; as wide, broadest midway between eyes 

 and base, cheeks nearly parallel but converging very slightly to eyes and 

 more rapidly to base of head ; dorsal and lateral surfaces without sculpture, 

 set with a few minute spines; vertex slightly produced, overhanging, and 

 bearing the anterior ocellus at its extremity, which slightly surpasses the 

 anterior margin of eyes; postocular bristles less than half as long as eyes, 

 conically expanded at tip. Eyes nearly one-third as long as head, not 

 protruding. Anterior ocellus directed forward, posterior ocelli just in ad- 

 vance of a line drawn through middle of eyes. Antennae about 1.6 times 

 as long as head; segments 7 and 8 scarcely compactly united; sense cones 

 short and slender; formula: 3, 0-1; 4, 2-2; 5, 1-1 + 1 ; 6, 1-0+ 1 ; 7 with one 

 on dorsum near apex; segments 1 and 2 brown, darker than head, 2 paler 

 toward apex; 3-6 pale yellow; 7 and 8 brownish yellow, paler than 1 and 

 2. Mouth cone blunt, much shorter than width of head, reaching about 

 two-thirds across prosternum; labrum about attaining tip of labium. 



Prothorax slightly more than half as long as head and (inclusive of 

 coxse) about twice as wide as long; surface smooth; no median thickening; 

 all usual bristles present, conically expanded at tip, the two pairs at the 

 posterior angles subequal in length to postoculars, the others and the coxal 

 shorter and of nearly equal length. Pterothorax distinctly wider than pro- 

 thorax, sides converging posteriorly. Legs moderately long, fore femora not 

 swollen, fore tarsi unarmed. Wings clear, slightly narrowed at middle, 

 without accessory hairs on posterior margin; subbasal bristles capitate, 

 the outer one longest and subequal to postocular. 



Abdomen normal; bristles largely capitate, all three pairs on segment 9 

 expanded at apex and two-thirds as long as tube, the terminal bristles 

 equal in length to tube. Tube somewhat more than half as long as head, 

 twice as long as basal width, and nearly twice as wide at base as at apex. 



Measurements of holotype (5 ): Length 1.52 mm.; head, length 0.240 

 mm., greatest width 0.161 mm., least width 0.144 mm.; eyes, length 0.076 

 mm., width 0.045 mm., interval 0.062 mm.; postocular bristles, length 

 0.033 mm.; prothorax, length 0.126 mm., width (inclusive of coxae) 0.258 

 mm.; pterothorax, length 0.348 mm., width 0.300 mm.; abdomen, greatest 

 width 0.294 mm. ; tube, length 0.128 mm., width at base 0.064 mm., at apex 

 0.034 mm. 



Antennal segments: 12 3 4 5 6 

 Length (n) 36 51 56 62 56 50 



Width (m) 35 28 28 30 26 24 



Total length of antenna, 0.383 mm. 



Described from two macropterous females taken by sweeping in a 

 forest, at Ayr, North Queensland, November 6, 1912, by A. A. Girault. 

 The coloration and unarmed fore tarsi are distinctive. 



Zygothrips inermis, sp. nov. 

 Female (macropterous). — Length about 1.4 mm Color dark brown, with 

 tarsi yellow and the apical portions of tibiae and the third antennal segment 

 brownish yellow; tube paler at base and in apical third. 



