so.im. NORTH AMERICAN THYSANOPTERA— HINDS. 199 



I have pliicod the sino'lo species iiKKiniifouoraJix in this genus, though 

 J do uot know the female, 'i'be characters of the fore femora and 

 antenna? are sufficient to separate it generically from PJdceothrips. 



ACANTHOTHRIPS MAGNAFEMORALIS, new species. 

 Plate IX, tl^'s. 9.'}, 94. 



}r(d(\ — Length 2. Itl mm.; width of mesothorax 0.42 mm. General 

 color yellowish lirown with untennie, legs, and eighth and ninth abdom- 

 inal segments banded with nearly transpai'ent or yellowish white. 



Head nearly one and one-fourth times as long as wide; cheeks bulg- 

 ing a))ru]^tly and greatly l)ehind the eyes, then converging to the neck, 

 which is as wide as the diameter through the eyes; cheeks, especiallj'" 

 anterior parts, set with short spines borne upon very prominent tuber- 

 cles; front between eyes ver}^ narrow, carinated. P^yes large, finely 

 faceted, reniform above, inner edges parallel; ocelli small, approxi- 

 mate, and placed between the middle of the eyes. Proboscis long, 

 slender, pointed; labrum sharply pointed. Antenna^ scarcely twice as 

 long as the head and ver^^ slender; relative lengths of segments as 

 follows : 



10 12 29 26 23 15 15 9 



Segments one to five subequal in thickness; three to five similar in 

 shape, elongated, urn-shaped; eight sharply conical. S(^gments one, 

 two, seven, and eight quite uniformly dark brown; bases of three to 

 five and tips of three and four pale yellowish, nearly white on three; 

 six entirely pale yellow, with slight brownish tinge on outer half; 

 antenna? appear annulated Avith pale yellow and dark brown. Spines 

 and sense cones long, slender, and light colored; the cones on three to 

 five fully one-third the length of segment three and on six about three- 

 fifths its length. 



Prothorax a])out two-thirds as long as head; width to outer angles 

 of coxte nearly twice its length; transverse margin nearly straight; 

 the usual stout spines on thorax and abdomen, except those at tip of 

 tube, are extremely short and blunt. Mesothorax slightly wider than 

 the abdomen; middle of pterothorax concaved slightly. Wings long 

 and rather slender. Legs moderately long; fore femora extremely 

 thick and large, almost as wide as length of fore tibia?; fore femora 

 armed with a stout tooth at the tip within; fore tibijv bent outward at 

 base; fore tarsi one segmented, armed with a very stout tooth; middle 

 and hind tibii« rather short and swollen in the middle, their tibiae 

 quite slender and their tarsi two segmented. Fore femora j'^ellowish 

 brown; fore tibia? and tarsi pale yellowish, tibiti? alone shaded with 

 brown on middle of outside; middle and hind femora almost trans- 

 parent white at base, outer half shaded with brown and having a 



