18 INSECUTOR INSCITL/E MENSTRUUS 



D. C. The species was previously known only from three females cind 

 one male, taken in Illinois and Kentucky. 



Scirtothrips brevipennis, new species. 



Female : Length about 0.82 mm. General color light yellow ochre, 

 head whitish, prothorax shaded with gray ; antennae brown beyond first 

 segment, bases of intermediate segments gray ; legs yellowish gray. 



Head twice as wide as long and three-fourths as long as prothoreix, 

 rounded anteriorly ; frontal costa not visible from above ; cheeks slightly 

 arcuate. Eyes not protruding, about three times as long as their distance 

 from posterior margin of head and three-fourths as wide as their interval, 

 setose. Ocelli approximate, opposite center of eyes. Antennae about 

 3.2 times as long as head, formed as usueJ in the genus ; segment I pale 

 yellow ; 2—8 dark brown, the intermediate segments paler basally, 4 

 and 5 each with a narrow, almost black ring at base. Maxillary palpi 

 3-segmented. 



Prothorax nearly twice as wide as long and about 1 .3 times as long 

 as head ; ochraceous pigment denser along lateral and posterior margins ; 

 pronotum with minute, close, transverse striae, and about 20 scattered, 

 dark bristles, the pair at the posterior angles much the longest, nearly 

 equal in length to eyes. Pterothorax about 1.3 times as wide as pro- 

 thorax, ochraceous pigment denser at sides. Wings of fore pair uniform 

 gray in color, hind wings pale, with dark median line ; fore wings about 

 nine times as long as greatest basal width exclusive of scale, 2.5 times as 

 long as antennae and four times as long as width of head ; anterior vein 

 of fore wings with about five or six dark bristles in basal half and three 

 dark, nearly equidistant ones in apical half ; posterior vein with three sim- 

 ilar bristles in apical half. 



Abdomen widest at about fifth segment, lemon yellow along middle 

 and at tip, almost raw sienna at sides ; bristles dark in color. 



Measurements of holotype : Length 0.81 6 mm. ; head, length 0.072 

 mm., width 0.150 mm.; prothorax, length 0.096 mm., width 0.180 

 mm. ; pterothorax, width 0.240 mm. ; abdomen, width 0.242 mm. 

 Antennal segments: 1, 19j«; 2, 37//.; 3, 43/^; 4, 40/<; 5, 38/^; 6, 

 43;<; 7, Ip.; 8, 12/«; total length of antenna, 0.23 mm., width at seg- 

 ment 4, 0.017 mm. 



Described from eight females, taken on red cedar {Juniperus virgin- 

 iana L.), Plummer's Island, Maryland, May 18, 1 9 1 3, by W. L. Mc- 

 Atee and the writer. 



