42 NORTH AMERICAN THYSANOPTERA. 



abdomen, width 0.25 mm.; total length 1.16 mm. Antennae: 1, 12 /x; 

 2, 30 n; 3, 39 /z; 4, 30 /i; 5, 30 /i; 6, 30 /x: 7, 8, 9, 33 //; total length 

 0.21 mm. 



Color: Head and pro thorax grayish yellow; pterthorax orange; 

 abdomen brown, shading to darker toward tip. 



Head considerably wider than long, cheeks almost straight and 

 diverging behind. Front of head broadly rounded; back of head 

 very faintly cross-striated, without prominent spines. Eyes promi- 

 nent, black, occupying almost two-thirds of width of head. Ocelli 

 present, with light-brown inner crescents. Mouth-cone long and 

 slender, reaching almost to posterior margin of prothorax, tipped 

 with black. Maxillary palpi three-segmented, labial palpi two- 

 segmented, basal segment very short, second segment very long. 

 Antennse apparently with nine segments, only sUghtly more than 

 twice as long as head, segments 1, 2, 3, and base of 4 unicolorous with 

 head, segment 2 shaded with brown, tip of 4 and others shading quite 

 uniformly to dark brown, all spines transparent. 



Prothorax with angles broadly rounded, unicolorous with head, with 

 one prominent spine on each posterior angle; other smaller spines are 

 present but all are transparent. Mesothorax and metathorax united 

 evenly at sides and conspicuously orange-colored. Legs slender, 

 grayish yellow, unicolorous with head, all tibiae armed. Wings, includ- 

 ing veins and spines, transparent. Veins prominent. Costa with 

 twenty-five regularly placed spines, fore vein with a group of about 

 eight spines on basal half and two or three scattered spines near tip. 

 Posterior longitudinal veins arising from fore veins at about one- 

 third the wing's length from the base and ending abruptly near 

 tip of wing with about ten regularly placed spines ; fringe on anterior 

 pair of wings slight. 



Abdomen with segments 2 to 6, inclusive, almost equal and with sides 

 parallel. Segments 8, 9, and 10 with sides abruptly converging to 

 meet the smaller pointed tenth segment. Surface of abdomen cross- 

 striated. Posterior margins of dorsal plates of segments 5 to 8, 

 inclusive, with arrangement of short, sharp spines; these are most 

 conspicuous on segments 7 and 8. Abdomen dark brown, shading 

 to darker toward tip, all spines of abdomen dark brown. 



Habitat: Tulare County, Cal. Taken on goldenrod and orange 

 foliage. Specimens collected by Mr. P. K, Jones. 

 (75) Trichothrips ruber new species. (PL V, fig. 39; PL VI, fig. 40.) 



Measurements: Head, length 0.18 mm., width 0.19 mm. ; prothorax, 

 length 0.14 mm., width 0.28 mm.; mesothorax, width 0.33 mm.; 

 abdomen, width 0.33 mm.; tube length 0.12 mm.; total body, length 

 1.42 mm. Antennse: 1, 18 /i; 2, 42 ^', 3, 36 /<; 4, 48 /f ; 5, 42 //; 6, 39 /<; 

 7, 33 [x; 8, 21 //; total 0.28 mm. 



