June, ig 1 5.] HoOD AND WiLLIAMS : NeW ThYSANOPTERA. 129 



three-fifths, 6 yellow in basal third, remainder of antenna dark blackish brown ; 

 legs about concolorous with body, the tibiae and tarsi somewhat lighter ; 

 hypodermal pigment orange yellow. 



Head slightly longer than wide, broad in front, sides converging from 

 just outside eyes to back of head, occipital region distinctly subreticulate 

 and with a few minute spines ; postocular bristles almost half as long as 

 head, pointed. Eyes small, directed forward, external margin (in dorsal view) 

 only about one-fifth the length of the head. Anterior ocellus directed slightly 

 forward, the two posterior ones small and opposite anterior third of eyes. 

 Antennae a little more than twice the length of the head; segment i large 

 and slightly tapering to apex ; 2 longer and narrower than i ; 3 the longest, 

 subconical ; remaining segments successively shorter and narrower ; 7 pedi- 

 cellate ; 8 lanceolate, pedicellate; sense cones: 3, 1—2; 4, 2-2; 5, i-i+i; 6, 

 I— i+i ; 7 with one on dorsum near apex. Mouth cone reaching about two- 

 thirds across prosternum ; labrum slightly surpassing labium. 



Prothorax about .95 as long as head and (inclusive of coxje) about 1.9 

 times as wide as long ; anterior marginal bristles very short ; others distinct, 

 pointed, the three posterior pairs subequal, fully as long as postoculars and 

 about twice as long as anterior laterals; coxal bristle about equal in length 

 to anterior lateral. Pterothorax slightly narrwer than prothorax, sides al- 

 most parallel. Wings reduced to small pads. Fore tarsus with a stout, 

 straight tooth. 



Abdomen normal, slightly wider than prothorax. Tube about .85 as long 

 as head, about 2.3 times as long as basal width and more than twice as 

 broad at base as at apex. Bristles long and pointed, those on the ninth 

 segment almost as long as the tube ; terminal bristles two-thirds the length 

 of tube. 



Measurements of holotype : Length i.S4mm.; head, length 0.233 mm., width 

 0.221 mm.; prothorax, length 0.223 mm., width (inclusive of coxae) 0.420 

 mm. ; pterothorax, width o. 386 mm. ; abdomen, width 0.462 mm. ; tube, length 

 0.204 mm., width at base 0.0S7 mm., at apex 0.039 mm. 



Antennae : i 



Length (fx) 51 



Width (m) 48 



Total length, 0.472 mm. 



Male (brachypterous). — Smaller than female (length about 1.7 mm.). Pro- 

 thorax twice as broad as long; abdominal spines, except for terminal ones, 

 slightly shorter. 



Nymphs. — -Orange yellow. 



Described from 3 females, 2 males, and 20 nymphs of various 

 stages taken under the bark of a willow tree in New Orleans, Louisi- 

 ana, December 2, 1914, by C. B. Williams. 



The principal diagnostic characters of this species are the form of 



