DESCRIPTIONS OF NEW GENERA AND SPECIES. 35 



palpi geniculated and with eight segments. Labial palpi with tliree 

 segments. Prothorax about as long as head and only a little wider, 

 without large bristles. Legs long and slender; fore femora somewhat 

 tliickened in both sexes. Wings present in both sexes; fore wings 

 very slightly narrowed before the middle; fore part of ring vein and 

 fore longitudinal vein furnished with a few sparse, inconspicuous 

 hairs; fore wings white, with dark-brown longitudinal band along 

 posterior margin. 



(3) Erythrothrips arizonse new species. (PL I, figs. 1-7.) 



Measurements: Head, length 0.24 nam., width 0.19 mm.; protho- 

 rax, length 0.24 mm., width 0.23 mm.; mesothorax, width 0.38 mm.; 

 abdomen, width 0.49 mm.; total body, length 2.66 mm. Antennae: 

 1,45//; 2, 63/(;3, 126 /x; 4, 111 //; 5, 6, 72/z; 7, 69;/ ; 8, 30/^; 9, 18//; 

 total length, 0.64 mm. 



Color dark brown, with red pigmentation; connecting tissue of 

 abdominal segments light brown to brown. 



Head about one-fourth longer than wide, rounded in front and 

 elevated only a little between basal segments of antenna?; cheeks 

 sUghtly arched, converging but very slightly posteriorly; back of 

 head cross-striated; without prominent spines. £yes prominent, not 

 protruding, black; eyes with large facets, pilose. Ocelli present. 

 Mouth-cone short, pointed; maxillary palpi geniculate, eight-seg- 

 mented; labial palpi four-segmented; basal segment small. Antennse 

 nine-segmented, two and one-half times as long as head; brown, uni- 

 colorous with body except basal part of segment 3, wliich is light 

 brown. All segments thickly clothed with short spines. A long 

 slender sense area on each of segments 3 and 4. 



Prothorax about as wide as long and only a little larger than the 

 head; with several inconspicuous spines ;^ all angles broadly rounded. 

 Legs uniformly dark bro^vn in females, but fore tibije and tarsi 

 shading to light brown in males. Fore femora slightly enlarged; 

 tibise each with a stout spine at tip; all legs tliickly set with short, 

 dark spines. Fore wings of about even width for entire length, very 

 slightly narrowed before the middle, broadly rounded at tip; with 

 ring vein and two longitudinal veins that unite -svith ring vein near 

 tip; with five cross veins; fore part of ring vein and fore longitudinal 

 vein with small, white, inconspicuous spines; second longitudmal vein 

 with about twenty-seven dark spines. Posterior margin of wing only 

 with fringe. Wings clear wliite, with dark-bro^vn longitudinal band 

 extending from base, including scale, to tip, tliis band broadest at 

 middle of wing and somewhat narrowed before the middle. Hind 

 wings clear white, margined \vith fringe only along posterior side. 



Abdomen large, fourth and fifth segments mdest and from them 

 tapering gradually to the bluntly pointed tenth segment. Without 



