38 NORTH AMERICAN THYSANOPTERA. 



largest, with notch on either side near posterior margin, uniting 

 evenly with metathorax. Legs slender, with numerous hairs but 

 without claws. Fore wings strong, broadest at base, tapering grad- 

 ually from base to point at tip; anterior part of ring-vein prominent, 

 posterior part and other longitudinal veins wanting. With a row of 

 tliirtoen long, brown, blunt spines along anterior margin, and ten other 

 similar spines close to anterior margin where fore longitudinal vein 

 should be; fore fringe long and wavy, especially on outer half of 

 wing; posterior fringe also well developed. Wings uniform dark 

 brown, with elongate whitened area near base. Posterior pair of 

 wings each with single, median, dark brown, longitudinal vein extend- 

 ing from base to near tip ; wing membrane brown, fringe well devel- 

 oped. 



Abdomen widest across tliird and fourth segments and from them 

 tapering gradually to a blunt tip; with numerous spines along sides 

 and on dorsum; a single pair near anterior margin on each segment 

 most conspicuous. 



Described from a single female. 



Habitat: Acapulco, Mexico. 



Specimens taken from a small potted plant on shipboard in San 

 Francisco from Acapulco, Mexico. One adult with numerous larvse 

 and pupfe. 

 (40) Euthrips parvus new species. (PI. IV, figs. 23-25.) 



Measurements: Head, length 0.09 mm., width 0.126 mm.; pro- 

 thorax, length 0.096 mm., width 0.144 mm.; mesothorax, width 0.16 

 mm.; abdomen, width 0.21 mm.; total body, length 0.95 mm. 



Antenna?: 1,15/i; 2,30//; 3, 45 //; 4, 39 //; 5, 36 //; 6, 45 ;£;7,9 //; 

 8, 12 /i; total length 0.225 mm. 



General color orange-yellow; forewings, as also segments 3 to 8 of 

 antennae, light bro^vn. 



Head angular in front, with depression to receive basal segments 

 of antennae; frons depressed, broadest across eyes; sides of head 

 constricted posteriorly, not retracted into prothorax; back of head 

 faintly cross-striated; two sm.all spines in front of anterior ocellus 

 and one in front of each posterior ocellus; a pair bordering the 

 posterior inner side of each eye. Eyes large, ovoid, prominent and 

 protruding; facets large, pilose. Ocelli located in central part of 

 head, closely placed but not contiguous, yellow, with orange-red 

 crescents; anterior ocellus in depression on fore part of head and 

 directed forward. Mouth-cone short, blunt, tipped with black; 

 maxillary palpi with three segments, labial palpi with two. Antennx 

 with eight segments, two and one-half times as long as head; seg- 

 ment 1 pale yellow, 2 orange-brown, others uniformly brown; 

 spines and sense cones present but not conspicuous. 



