TWO NEW THYSANOPTERA FROM PANAMA 51 



Head about 1 .2 times as long as wide, broadest just behind eyes ; 

 cheeks rounded to eyes and converged gently to a slight collar-like widen- 

 ing at base ; dorsaJ and lateral surfaces with close, transverse striae and a 

 few minute bristles ; postocular bristles capitate, slightly less thein half as 

 long as eyes. Eyes large, prominent, reniform, heJf as long as head, 

 almost enclosing the ocelli, neeu-ly contiguous below anterior ocellus, pro- 

 duced inward behind the posterior ocelli to near the median line, the 

 interval at this point only slightly more than one-third the greatest width 

 of eye. Ocelli closely approximate and anterior in position. Antennae 

 slender, about 1 . 7 times as long as head and twice its width ; segment 1 

 slightly wider than long ; 2 subcylindrical, about tvsdce as long as wide ; 

 3 and 4 claviform, pedicellate, the former about two and one-half times 

 as long as greatest width and with a very narrow pedicel ; 5—7 subfusi- 

 form, truncate at either end ; 8 about 0.8 as long as 7, slender, neirrowed 

 at base ; sense cones and spines slender, nearly transparent. Color of 

 antennae : Segments I and 2 nearly concolorous with head ; 3 pale gray- 

 ish yellow, slightly darker neeir base and along outer surface ; 4-6 nearly 

 uniform pale grayish yellow, 6 shaded with gray apically ; 7 and 8 light 

 olive gray, the former yellowish at base. Mouth cone less than heJf as 

 long as dorsum of head and somewhat wider thcin long. 



Prothorax about hcdf as long as head and (inclusive of coxae) distinctly 

 more than twice as wide as long ; pronotum with short mediam thicken- 

 ing ; all usual bristles present, capitate, the pair at the posterior angles 

 longest ; coxal bristle capitate, about as long as anterior marginal pair. 

 Pterothorax slightly wider tham prothorax. Wings dark browTi at ex- 

 treme base and lightly shaded with brown toward apex, the intermediate 

 portion white ; fore wings with about eight interlocated hairs on posterior 

 margin. Legs slender ; fore tibiae, all tarsi, and usually the hind coxae 

 and femorcu nemly clear white ; fore tarsi unarmed. 



Abdomen slender, only slightly v^der than pterothorax. Segments 

 1 -3 (rarely only 1 and 2) white, with a light wash of yellow, the third 

 segment with a gray blotch in median third, just behind the transverse 

 carina neeir bcise. Tube about 0.7 as long as head and about twice as 

 wide at base as at apex. Abdominal bristles yellow or brown in color, 

 terminal bristles darkest, distinctly shorter than tube. 



Measurements of holotype: Length 1,67 mm.; head, length 0.252 

 mm., width 0.2 12 mm. ; prothorax, length 0.124 mm., width, inclusive 

 of coxae, 0.348 mm.; pterothorax, width 0.372 mm.; abdomen, width 



