80 Proceedings of the Biological Society of Washington. 



Head about 1.3 times as long as wide, broadest at basal third, thence 

 gradually narrowing to eyes and to base; vertex not produced nor over- 

 hanging; postocular bristles nearly as long as eyes, capitate. Eyes about 

 one-fourth as long as head, not protruding. Anterior ocellus directed for- 

 ward and upward, not overhanging; posterior ocelli slightly in front of a 

 line drawn through middle of eyes. Antenna; about 1.7 times as long 

 as head; segments 7 and 8 closely but not compactly united; sense cones 

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

 on dorsum near apex; segments 1, 2 and 5-8 concolorous with head, except 

 2 which is lighter toward apex; 3 much lighter, darker at apex than 

 at base; 4 slightly lighter than 5 but distinctly darker than 3. Mouth cone 

 blunt, much shorter than width of head, reaching about to middle of 

 prosternum; labrum about attaining tip of labium. 



Prothorax three-fourths as long as head and (inclusive of coxae) nearly 

 twice as wide as long; surface smooth; median thickening distinct; anterior 

 marginal bristles minute, others (including coxal) conically expanded at tip 

 and subequal to postoculars. Pterothorax slightly narrower than pro- 

 thorax, sides converging posteriorly. Legs moderately short, fore femora 

 moderately stout, fore tarsus unarmed. Wings slightly narrowed near 

 middle; subbasal bristles on fore wings conically expanded at tip, slightly 

 shorter than postoculars. 



Abdomen normal; bristles largely capitate, the two lateral pairs on seg- 

 ment 9 pointed and much longer than tube, the dorsal pair capitate and 

 shorter than tube, the terminal bristles fully twice as long as tube. Tube 

 slightly less than 0.6 as long as head, nearly twice as long as basal width, 

 and not quite twice as broad at base as at apex. 



Measurements of holotype (?): Length 1.36 mm.; head, length 0.196 

 mm., greatest width 0.149 mm.; eyes, length 0.054 mm., width 0.037 mm., 

 interval 0.057 mm.; postocular bristles, length 0.050 mm.; prothorax, 

 length 0.145 mm., width (inclusive of coxse) 0.282 mm.; pterothorax, width 

 0.270 mm.; abdomen, greatest width 0.313 mm.; tube, length 0.110 mm., 

 width at base 0.060 mm., at apex 0.033 mm. 



Antennal segments: 1 2345678 

 Length (/*) 37 47 45 49 42 39 42 28 



Width (/*) 32 29 27 27 24 22 19 13 



Total length of antenna, 0.329 mm. 



Described from one macropterous female taken by sweeping grass in 

 a forest, at Aloomba, North Queensland, July 7, 1912, by A. A. Girault. 



Distinguished from all other members of its genus by the unarmed fore 

 tarsi and the unusually long bristles at the tip of the tube. 



Zygothrips cingulatus, sp. nov. 



Female (macropterous). — Length about 1.2 mm. Head, thorax, last three 

 abdominal segments, the two basal and two apical antennal segments, 

 and most of fore and mid femora, dark brown; remaining segments of 

 abdomen, all of hind legs, fore and mid tibia? and tarsi, apices of fore and 

 mid femora, and antennal segments 3-6 pale yellow; wings colorless. 



