NEW CALIFORNIA AND GEORGIA THYSANOPTERA. 13 



Head about one and one-third times as wide as long, rounded in 

 front, retracted considerably within the prothorax; cheeks slightly 

 arched; back of head transversely striate, bearing five small spines 

 in a row posterior to each eye; also one on each side and two in front 

 of anterior ocellus. Eyes prominent, oval in outline, black, with 

 light borders, finel}' faceted, not pilose. Ocelli subapproximate, 

 light yellow, with reddish brown crescents. Mouth-cone very long, 

 pointed, reaching to middle of mesosternum, tipped with black; max- 

 illary palpi large, long, 3-segmented, middle segment shortest; 

 labial palpi 2-segmented. Antennse 8-segmented, nearly two and 

 four-fifths times as long as head, uniform light-yellowish gray-brown, 

 except segments 1 and 3, which are lighter, and apex and base of 

 segment 3 broadly, base of segment 4, and segment 5, which are 

 transparent white; segment 3 with a distinct handle, segments 2, 

 4, and 5 constricted somewhat at the base; a forked sense-cone on 

 dorsal side of segment 3, a similar one on ventral side of segment 4, 

 a short, simple sense-cone on lateral side of segment 5, near apex; 

 spines pale brown. 



Prothorax slightly wider than long, one and one-half times as long 

 as head; a very small, weak spine at each anterior angle, two strong 

 ones at each posterior angle, a row of short spines on the posterior 

 margin, and a number on the dorsum. Mesothorax largest, angles 

 rounded. Legs long, lighter than bod}^, dilute yellowish gray-brown, 

 femora darker; in some specimens the legs are 3^ellowish- white, hind 

 •femora darker. Spines at tip of fore and middle tibiae weak; several 

 strong spines at apex of hind tibiae. Wings present, yellowish- 

 white. Veins usually indistinct and tending to disintegrate in 

 mounted specimens. Wings sometimes extending past tip of abdo- 

 men, but usually shorter in proportion to abdomen. Spines arranged 

 as follows: Costa with 21 spines, fore longitudinal vein with eleven 

 spines, seven on basal half of wing, three in one group, four in the 

 other, and four scattered spines on apical half, one of which is near • 

 apex; hind longitudinal vein with ten regularly placed spines begin- 

 ning where basal group ends on fore longitudinal vein. 



Abdomen subovate, tapering quite suddenly from segment 7. A 

 number of long, stout spines on last three segments. Last segment 

 split above on dorsum. 



Described from four females taken from flowers of a perennial 

 lupine, Los Gatos, Cal., May, 1910 (P. R. Jones). Male unknown. 

 Euthrips costalis new species. (PL IV, figs. 1-4.) 



Measurements: Head, length 0.10 mm., width 0.166 mm.; pro- 

 thorax, length O.ll mm., width 0.183 mm.; mesothorax, width 

 0.283 mm.; abdomen, width 0.316 mm. Antennae: Segment 1, 27 n; 

 2, 36 n; 3, 48 /z; 4, 45 //; 5, 36 ;/; 6, 51 /z; 7, 9 n; 8, 12 jx; total length of 

 antennae 0.264 mm. Total body length 1.33 mm. 



