1918] Weiss and Dickcrson — Notes on Trioza Alacris 61 



distal tip transparent, remainder opaque. Inserted in leaf tissue 

 by means of a minute extension at basal end. One side rests close 

 to leaf surface and becomes flattened. Other side is convex. 



The following descriptions were made from alcoholic material. 



First Stage Nyyiiph: Length O.^l mm., greatest width 0.1 mm. 

 Color white; shape oval, broadly rounded at both ends, slightly 

 sinuate at anterior margin ; broadest across middle of thorax which 

 gradually narrows at posterior extremity. Abdomen narrower 

 than thorax. Body segmentation somewhat indistinct, that of 

 abdomen indicated. Head, thorax and abdomen subequal in 

 length. Body sparsely covered with minute hairs. Eyes indicated 

 by red spots on lateral posterior margins of head. Antennse length 

 about one-third width of thorax, cone shaped, twice as long as 

 wndth of base, tip slightly truncate; a minute spine arising from tip 

 with a smaller one below. Legs, length, two-thirds the width of 

 the thorax, gradually tapering toward tip; segmentation indistinct; 

 apical end of leg bearing a sucker disc and a spine. Rostrum long, 

 fine, hair-hke; basal sheath extending to between bases of third 

 pair of legs. 



Second Stage Nyiiiph: Length 0.3 mm., greatest width 0.15 

 mm. Color white; shape rectangular to broadly oval. Anterior 

 end of body truncate, outer angles broadly rounded. Body 

 gradually widening to posterior third of thorax, then gradually 

 narrowing to posterior thoracic margin. Abdomen slightly nar- 

 rower than thorax, posterior end rounded. Body sparsely hairy, 

 segmentation indistinct. Antennse cone shaped, length one-fifth 

 width of thorax, outer extremity transversely ridged bearing two 

 spines at tip. Legs similar to those of preceding stage except that 

 they are proportionately larger and the sucker disc is missing. 

 Tip of leg bears a pair of minute hooks. Eyes red. Basal sheath 

 of rostrum extends to bases of second pair of legs. 



Third Stage Nymph: Length 0.5 mm., greatest width 0.22 mm. 

 Similar to second stage in shape and color except central dorsal 

 portion of thorax and posterior margins of abdominal segments 

 which are tinged with brown. Lateral margin of thorax bears a 

 row of minute spines. A pair of these spines on lateral margin of 

 each abdominal segment. Antennse similar to those of preceding 

 stage, length, one-sixth width of thorax. Eyes and legs similar to 

 those of preceding stage. Basal sheath of rostrum extending to 

 bases of second pair of legs. 



