40 '' NORTH AMERICAN THYSANOPTERA. 



regularly placed spines, these beginning immediately below where 

 the group of six spines on fore vein ends. Spines brown. 



Abdomen elongate-ovate, tapering rather gradually from third 

 segment to near tip ; with prominent spines on outer posterior angles 

 of all abdominal segments except first. 



Described from one female taken on peach foliage, Red Bluff, Cal. 

 (52) Euthrips heliantlii new species. (PI. IV, figs. 26-29.) 



Measurements: Head, length 0.135 mm., width 0.16 mm.; pro- 

 thorax, length 0.150 mm., width 0.20 mm.; mesothorax, width 

 0.28 mm.; abdomen, width 0.28 mm.; total body, length 1.25 mm. 



Antennae: 1, 21 pt; 2, 39 fx; 3, 60 /i; 4, 51 /z; 5,42^; 6, 54/z; 7,9//; 

 8, 15 fi; total length 0.300 mm. 



General color transparent yellowish-gray, shaded with brown. 



Head only a little wider than long, cheeks straight and parallel; 

 anterior margin only shghtly elevated and rounded in front, back of 

 head very faintly cross-striated. Head retracted into pro thorax. 

 Large, brown, conspicuous spines in front of posterior ocelli and back 

 of eyes; other smaller spines present, also dark brown and conspicu- 

 ous. Eyes rather small, occupying about one-half the width of the 

 head, not prominent, with purple-black pigment, pilose. Ocelli 

 present, translucent whitish, separated, and posterior ones not 

 contiguous to eyes, with light orange-yellow pigment blotches which 

 are only irregularly crescent-shaped. Mouth-cone pointed, dark 

 brown, nearly black at tip. Maxillary palpi three-segmented, labial 

 palpi two-segmented, basal segment very short. Antennae eight- 

 segmented, only slightly more than twice as long as head, segment 

 1 hght yellowish gray, unicolorous with head; 2 dark brown; 3, 4, 

 and 5 brown, yellowish at base; 3 also sometimes yellowish at tip; 

 6 and style uniform dark brown. A forked sense cone on dorsal side 

 of segment 3 near tip, and a similar one near tip on ventral side of 

 segment 4. All spines dark brown and conspicuous. 



ProtJiorax about one-fourth wider than long, with a long, conspicu- 

 ous, dark-brown spine at each anterior angle, two at each posterior 

 angle, one on either side of anterior margin about halfway between 

 center and side, a medium-sized dark spine on posterior margin on 

 either side near center, and many other smaller spines, also brown 

 and conspicuous. Mesotliorax with angles broadly rounded in front, 

 uniting almost evenly with metathorax, the sides of which con- 

 verge posteriorly. Legs with fore femora somewhat tliickened, light 

 brownish gray; all tibise armed; all tarsi with a dark-brown spot 

 near tip. Wings uniform translucent wliitish. Veins set regularly 

 with spines; costa with about twenty-seven, fore vein with twenty- 

 one, hind vein with fifteen, scale with six, inner side of scale with one ; 

 all spines brown. Microscopic hairs transparent; costal fringe short; 

 posterior fringe long and wavy. 



