12 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.46. 



and are very nearly as long as the lateral spines. This segment also 

 bears two other very strong, dark-brown spines, one on each lateral 

 margin about midway between the base and tip of the segment. 

 This segment also bears a few smaller spines, one of which stands on 

 each side the meson dorsally, in the apical row. The tenth segment 

 bears four long, strong, brown spines, two on each side near the 

 lateral margin, about two- thirds the distance from the base of the 

 segment to the tip. Of these spines the two more dorso-cephalad 

 are much the stouter and are strongly in-curved. Tenth segment 

 large, lateral margins convex; tip is broadly rounded. A few small, 

 almost transparent spines are borne on the segment. 



ANAPHOTHRIPS ARIZONENSIS, new species. 

 Figs. 23-26. 



Female. — Length 0.96 mm. (0.89 mm. — 1), width of mesothorax at 

 front angles 0.2 (0.18 mm. -0.22). General color very light yellow, 

 almost white, with brownish shadings on head and prothorax, meso- 

 and metathorax heavily tinged with orange. 



Head about one-half wider than long, slightly rounded in front, 

 diverging behind; cheeks roughened; dorsum faintly transversely 

 striate back of eyes; very light yellow with a slight brownish tinge; 

 no spines visible. Eyes of medium size, rather • coarsely facetted; 

 black by transmitted light, orange by reflected light; occeli sub- 

 approximate, situated upon the sides of a slight hump, yellow, mar- 

 gined inwardly with brownish yellow crescents. Mouth cone reach- 

 ing only slightly past the middle of the prothorax, somewhat nar- 

 rowed at the middle, tipped with black; first and third segments of 

 maxillary palpi of equal length, the second half as long as the first, 

 third segment tipped with three hairs; first segment of labial palpi 

 very short, the second long and slender. Antennae subapproximate 

 at the base, clearly only ejght segmented; relative lengths of segments 

 as follows (from the average measurements of eight antennas) : 



_L 2 3 4 5 6 7 8 



4.4 7.6 9.7 8.6 8 9.5 1.7 2 



Segment one rounded at the base; two nearly barrel-shaped, nar- 

 rowed at the base; three to five stalked, three and five very notice- 

 ably, four weakly; three and five broaden to near the tips which are 

 constricted; four nearly barrel-shaped; six fusiform. One is pale, 

 almost white; two very light brownish yellow; three gray in basal 

 half shading to yellow at tip; four brownish yellow except extreme 

 base which is somewhat paler; five to eight light brown, six the 

 darkest. Spines few, minute, pale and inconspicuous. A simple 

 sense cone on outer margin of three near tip; a branched cone on 



