126 Journal New York Entomological Society. [Voi. xxiii. 



Measurements of holotype : Length 1.236 mm.; head, length 0.197 mm., 

 width 0.160 mm.; prothorax, length 0.113 mm.; width (inclusive of coxae) 0.252 

 mm. ; pterothorax, width 0.240 mm. ; abdomen, width 0.240 mm. ; tube, length 

 0.099 mm.; width at base 0.057 mm., at apex 0.027 mm. 



Antennas : 12345678 



Length (/jl) 24 37 48 47 41 39 36 26 



Width (/J.) 32 27 26 25 20 22 19 II 



Total length, 0.298 mm. 



Male (macropterous). — Length about i mm. Fore femora sometimes en- 

 larged (Plate — , figs. 4 and 5), fore tarsi with a stout straight tooth. Other- 

 wise nearly as female. 



Described from twenty females and four males collected from 

 rushes at Orlando, Florida, November 8, 1914; two females from 

 grass at the edge of a canal, Leesburg, Florida, November 16, 1914; 

 and one female from rushes, Emeralda, Florida, November 17, 1914, 

 — all taken by C. B. Williams. 



This species finds its closest relative in H. (f) tibialis Hood, from 

 Porto Rico, as shown by such characters as the production of the 

 eyes on the ventral surface of the head and the narrow wings which 

 are scarcely narrowed at middle. The coloration of the legs is the 

 most readily observed character for their separation. 



Zygothrips bicolor new species. (Plate VIIL, figs. 6 and 7.) 



Female (macropterous). — Length about 1.5 mm. Color: head, thorax, 

 abdominal segments 9 and 10, and basal two-thirds of fore femora dark 

 brown, segments i, 7, and 8 of antennae slightly paler; abdomen, middle 

 and hind legs, and the tarsus, tibia, and apex of femur of fore legs, and 

 antennal segments 2—6, pale yellow. 



Head about 1.4 times as long as wide, broadest about half way back, 

 narrowing slightly to apex and base, verfex rounded and evenly declivous; 

 a few strife near posterior margin ; postocular bristles long and capitate. 

 Eyes about .28 as long as head, very slightly protruding. Anterior ocellus 

 directed forward ; posterior pair opposite anterior third of eyes. Antennae 

 about 1.7 times as long as head; segment i short, tapering slightly from base; 

 2 the widest, subglobose, constricted near base ; 3 and 4 almost equal in 

 width ; 5-8 successively narrower ; 7 longer than 4 ; 8 subconical, broadly 

 united to 7 ; sense cones very weak and transparent, barely visible. Mouth 

 cone blunt, much shorter than the width of the head, barely reaching middle 

 of prosternum ; tip of labrum just attaining tip of labium. 



Prothorax about as long as width of head and (inclusive of coxae) about 1.9 

 times as wide as long : anterior marginal bristles wanting or exceedingly minute ; 



