N, i:m NORTH AMERICAN THYSANOPTERA— HINDS. 157 



SCOLOTHRIPS, neAAT genus. 



Head wider than long, retracted considerably into prothorax. 

 Eyes protruding-; ocelli present. Maxillary palpi three segmented. 

 Antenna? short and thick; sense cones very long. Prothorax slightly 

 longer than head and somewhat broadened posteriorly. Spines 

 arranged as follows: One at each anterior angle, one halfway between 

 these angles and the median line, one at the middle of each side, two 

 at each hind angle, and one between this pair and the middle of the 

 hind margin. Wings present, slender, with two longitudinal veins 

 and ring vein strongly developed; fore fringe very weak but spines on 

 veins ver}^ strong. Intermediate abdominal segments with one spine 

 on each side at the hind angle. 



This genus is erected for the species G-niaculatus. 



(skgjXo'^ prickly or thorny; Opii/\) 



SCOLOTHRIPS 6-MACULATUS (Pergande) 



Plate IV, figs. 42-45. 



Thrips 6-macul.ata Pergande, Trans. St. Louis Acad., V, 1894, p. 542. 



Thrips pallida Beach, Proc. Iowa Acad. Sciences, 1895, III, (1896), pp. 226-227. 



Female. — Length, 0.83 mm. (0.72 to 0.97 mm.); width of meso- 

 thorax, 0.21 mm. (0.18 to 0.25 mm.). General color clear pale yellow. 



Head about three-fourths as long as wide, frequently considerably 

 retracted witliin prothorax, even to the eyes sometimes; cheeks 

 straight and parallel; front margin rounded; vertex elevated between 

 the ey^es. Eyes large, protruding; posterior ocelli nearly contiguous 

 with margins of e3^es; one ver}' long, backwardly curved spine stands 

 in front of each posterior ocellus, and two pairs of curved spines stand 

 upon the margin in front. Maxillary palpi slender, three segmented; 

 labial palpi very long and slender. Antennae rather short and com- 

 pact; inserted below front margin; approximate at base, relative 

 lengths of segments: 



Segment one cylindrical, about two-thirds as thick as two, which is 

 more rounded; seven and eight rather thick. Color of one and two 

 nearly white, the remainder almost uniformly dusk}' graj^; spines on 

 segments two to five long and prominent as are the sense cones; the 

 sense cone on the inner side of six arises below the middle of the 

 segment and reaches beyond the end of the seventh. 



Prothorax slightly longer than the head, but only about three-fourths 

 as long as wide, broadened somewhat posteriori}^ and rounded at hind 

 angles, sides curving gently inward anteriorly; spines extreme!}' long 

 and slender, arranged as follows: One at each anterior angle, one half 



