OF WASHINGTON. 



153 



They vary greatly 



joint, cup-shaped ; second, round and somewhat larger than the first; 

 third, oval, with petiole at both ends; fourth to eleventh inclusive, 

 oblong, each joined to the one succeeding it by a short, smooth petiole; 

 last joint without petiole. Thorax, dark ; meso-thorax as wide as the head, 

 with a few short hairs above and larger ones on the side; scutellum 

 prominent, projecting over base of metanotum, and with hairs on tip. 

 Legs long, pale, covered with short hairs ; coxa and trochanter together 

 nearly as long as femur; femur, tibia, and tarsus of about equal length; 

 front tibia with one small spur on tip; middle and hind tibia with two 

 small spurs, second one often obscure. 



Wings : length .5 to 1.5 mm. ; width, .2 to .5 mm 

 in breadth and length in different specimens, the 

 larger portion (about So per cent.) have very short 

 wings, scarcely extending beyond the second and 

 third segments of the abdomen, while others have 

 the wings projecting almost half their length be 

 yond the tip of the abdomen ; anterior and pos 

 terior margins with long hairs, the surface mi 

 nutely hairy. ; hyaline with rainbow reflections; 



the usual veins of the anterior part much thickened; auxiliary obscure, 

 if not obsolete; the first vein terminates in the costa at some dis 

 tance before the middle of the wing, the third vein at a considerable 

 distance before the tip; the thickened costa continuous beyond the 

 tip of the third for a distance equal to about half its penultimate sec- 



FIG. 12. Epidapus scabiei. 

 Short wing "of male en 

 larged 57 diameters. 



;. Epidapus scabiei. Female enlarged 35 diameters, a, dorsal aspect of head and 

 erior portion of thorax, b, genitalia. c, last joint of tarsus, showing petiole and claws. 



FIG. 13. _ r - ^ 



anterior portion of thoicui.. </, L;CHIUUI<U t, mi JUIUL ui itus 

 </, tip of tibia, showing spurs. _/", middle joints of antenna. 



tion ; the third vein arises near the end of the first at an angle with the 

 second section, which is continuous with the anterior cross-vein, or rather 

 with the thickened portion of the fourth vein, for the anterior cross-vein 

 is wholly obsolete, the prefurca of the fourth vein arising exactly from 

 the beginning of the second section of the third vein ; first and third veins 



