126 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



thiiii th(> others— in the genus Chirothrips they are extremel,y thick- 

 ened. The hind legs are usually longest and sometimes exceed the 

 ahdomen in length. 



The abdomen is constricted somewhat at its junction with the thorax 

 and is always ten segmented. The terminal segments are usually 

 shaped difl'erently in the two sexes; in the females the last three seg- 

 ments form a cone the apex of which is quite pointed, and rarely the 

 last segment is rather tubular instead of conical. The abdomen of 

 the male is usually more slender and lighter than that of the female, 

 and as a rule its end is much more blunt, though occasionally shaped 

 nuieh like that of the other sex. The ninth segment is comparatively 

 large and contains the genital apparatus, and frequently the tenth 

 segment is also much retracted within it. In the females the sexual 

 opening is between the eighth and ninth abdominal segments, but in 

 the males it is between the ninth and tenth. 



The female has a four-valved, saw-like ovipositor fitted to the under- 

 side of the eighth and ninth segments and reaching to about the tip of 

 the abdomen, sometimes a little beyond. When at rest this apparatus 

 lies partiallv concealed in a sheath on the underside of the last three 

 segments; when in action it can be let down so as to work at almost 

 an}^ angle less than 90 degrees. The copulatory apparatus of the 

 male is almost or entirely withdrawn into the body, but it is freely 

 protrusile. 



The males are often quicker motioned and more active than the 

 females. Most of the members of this suborder move rapidly, though 

 some arc quite sluggish; they run rapidl}^ and take flight readih'. 

 Some species, provided with well-developed wings, seem loath to use 

 them, and many possess a considerable power of leaping. 



Family .EOLOTHRIPID.E. 



The antenna' are nine segmented. Ocelli are present in both sexes. 

 The maxillary palpi are three segmented, and the la))ial palpi two or 

 four segmented. The wings are large, broad, and rounded at the 

 outer ends. In addition to a heavy ring vein, each fore wing has two 

 longitudinal veins extending from its base to tip, where they unite with 

 the ring vein on each. side of the tip, while the hind Avings have only 

 a vestige of a median longitudinal vein. Four or five cross veins are 

 present in each fore wing. The fore wings are without a fringe upon 

 the front edge, though some more or less stout hairs are there present 

 in some species. Both sexes bear a peculiar hook-like appendage on 

 the underside of the second segment of each fore tarsus. (See Plate I, 

 tig. 9.) The ovipositor of the female is bent upward so that its convex 

 side is ventral. The males have the first a])dominal segment much 

 longer than the second. The members of this family run rapidly, 

 having very long legs, Imt they do not appear to have the power of 

 springing. 



