88 Proceedings of the Biological Society of Washington. 



length and width distinctly less than dorsal. Anterior ocellus slightly 

 overhanging, directed forward. Antennae about 1.75 times as long as head, 

 segments 5 and 6 obliquely truncate on outer surface at apex, causing the 

 antennas to curve outward; segments 7 and 8 compactly united to form a 

 single mass, 8 short, about 1.7 times as long as greatest basal width; sense 

 cones short and inconspicuous, formula: 3, 0-1; 4, 1-1 + 1 ; 5, 1-1 + 1 ; 6, 

 1-1 + 1 ; 7 with one on dorsum near apex. Mouth cone broadly rounded at 

 apex, reaching three-fourths across prosternum, labrum not surpassing 

 labium. 



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

 twice as wide as long; pronotum smooth at middle, margins with faint 

 anastomosing lines; median thickening almost wanting; all usual bristles 

 present, the anterior marginals minute and pointed, others capitate and 

 light brown in color, shorter than postoculars, the outer pair at posterior 

 angles longest. Wings broad, the fore pair with about eleven accessory 

 hairs on posterior margin and with the three subbasal bristles short, pale, 

 capitate, and subequal in length. Fore tarsus with a stout curved tooth as 

 long as half the width of tarsus. 



Abdomen of normal form and structure. Tube about 0.8 the length of 

 head and more than twice as long as the basal width, which is somewhat 

 more than twice the apical, sides straight. Abdominal bristles rather long 

 and capitate, those on segment 9 two-thirds as long as tube; terminal 

 bristles equal in length to tube. 



Measurements of holotype ($): Length 1.70 mm.; head, length 0.244 

 mm., greatest width 0.208 mm., least width (near base) 0.196 mm.; eyes, 

 length 0.087 mm., width 0.060 mm., interval 0.072 mm.; postocular bristles, 

 length 0.060 mm.; prothorax, length 0.185 mm., width (inclusive of coxae) 

 0.366 mm.; pterothorax, length 0.384 mm., width 0.456 mm.; abdomen, 

 greatest width 0.508 mm.; tube, length 0.204 mm., width at base 0.096 

 mm., at apex 0.045 mm. 



Antennal segments: 12345678 

 Length (m) 48 62 60 60 62 59 51 30 



Width (m) 42 35 32 36 33 33 27 18 



Total length of antenna, 0.432 mm. 



Described from three females taken by sweeping in forest and in a yard 

 at Brooklyn, New South Wales, November 1 and 7-18, 1914, by A. A. 

 Girault. 



Separable by the brown wings, the yellow bases of antennal segments 

 3-6, and the presence of accessory hairs on the posterior margin of the 

 fore wings. 



Cryptothrips acanthus, sp. nov. 



Female (macropterous) . — Length about 2.3 mm. Color dark blackish 

 brown, with tarsi, fore tibiae, and articulations of legs paler; abdomen 

 nearly black; antennae concolorous with body, except segment 3 which is 

 abruptly brownish yellow and more darkly clouded with brown in apical 



