212 PROCEEDINGS OF THE NATIONAL MUSEUM. 



equal portions, connected in the middle by ii cross vein, and with 

 either border by other cross veins at about one-third and two-thirds of 

 the distance from the base to the tip of the wing; the wing is heavily 

 f rini'-ed, especially along the hind border. Hind wings veinless, nearly 

 as long, and at the tip nearly as broad, as the fore wings. Abdomen 

 nine jointed, half as long again as the thorax, rather tumid, scarcely 

 or not at all produced apically." 



PALiEOTHRIPS FOSSILIS Scudder. 



Palxothrips fumlis Scudder, Bull. U. S. Geol. Geog. Surv. Terr., I, 1875, 

 pp. 222-223.— Zirr EL, Handb. d. PaLieontology, I, Pt. 2, 1885, p. 784, 

 %. 999; Kept. U. S. Geol. Surv. Terr., XIII, 1890, pp. 373-374. 



"Head small, tapering a little in front, where, however, it is broadly 

 rounded. The antenniB are certainh^ seven jointed, and none of the 

 apical joints show any indication of being connate, the last joint being 

 of the same length as the two preceding it, tapering, and bluntly 

 pointed; none of the joints show any enlargement in the middle, but 

 the middle joints are slightly larger at the distal extremity than at the 

 base; they appear to be destitute of hairs. The prothorax is sub- 

 quadrate, a little l)roader than long, with rounded sides; the fore 

 femora are unusually stout, as long as the width of the prothorax. 

 The longitudinal veins of the fore wings approach each other somewhat 

 aljruptly in the middle, where they are united by a cross vein, and at 

 the tip of the wing they curve away from each other; the two cross 

 veins on the lower third of the wing are, respectively, slightly farther 

 from the base of the wing than the corresponding veins of the upper 

 third; the fringe on the posterior border is largest near the tip of the 

 wing, where the hairs are about three times as long as those on the 

 costal border. The first hind tarsal joint is scarcely longer than broad, 

 cylindrical; the second of about the same length, but decidedly broader 

 at apex than at the base; the apical joint is nearly globular, smallest 

 at base, as large in the middle as the l)ase of the other joints. There 

 are a few hairs at the tip of the abdomen and a few short ones on the 

 hind tibite; the apical ones stouter than the others, resembling spines; 

 but the insect appears to have been unusually destitute of hairs, 

 excepting on the wings, where not only the edges but also all the 

 veins are fringed. 



•'Length of body 1.6 to 1.8 mm.; of antennae 0.58 mm.; of fore 

 femora 0.32 nun.; breadth of same 0.14; length of fore tibire 0.32 

 mm.; of hind femora 0.88 mm; breadth of same 0,11 mm.; length of 

 hind tibi<\3 0.42 mm.; of hind tarsi 0.12 mm.; of fore wings 1.4 nnn.; 

 of hind wings 1.27 mm.; greatest breadth of fore wings 0.37 mm.; 

 length of prothorax 0.16 mm.; breadth of same 0.32 mm.; length of 

 wliole thorax 0.64 mm. ; of abdomen 0.i)2 nnn. ; greatest breadth of the 

 sanu> 0.;)7 mm. 



"Fossil Canyon, White River, Utah. W. Denton." 



