I 



NO. 1310. NORTH AMERICAN THYiSANOPTERA— HINDS. 195 



pterothorax nearh^ as wide as the abdomen.) Legs rather short and 

 thick; fore eoxtv project somewhat beyond thorax; fore femora 

 slightly thickened and the tarsi armed with a tiny tooth; tibia of each 

 leg slightly shorter than its femur; all tarsi short and thick. All 

 femora and middle and hind ti})i;e hrown: all tarsi and fore tibia', 

 except at base outside, pale yellow: a prominent brown spot at tip of 

 tarsi within. 



Alxlomen a})()ut three-tifths the length of the body; about one and 

 one-fourth times as broad as the mesothorax; nearly cylindri<'al to 

 seventh segment, then sides curve smoothly to base of tu))e. Tube less 

 than one-half as long as head and at middle only about one-ninth the 

 ])readth at middle of a))domen. Spines on abdomen of moderate 

 length, slender, acute, light colored, and not prominent. The abdo- 

 men is darkest at sides and tip; on each side of segments two to 

 eight, slightly outside the line of wing-contining s])ines, there is a 

 rounded or elliptical clear yellow spot. The ))ody lacks any striking- 

 coloration. 



Described from ten wingless and two winged females. 



<'<>fi/l>c.^L\\i. No. 0831, U.S.N.M. 



Jfah'. — The males are al)out five-sixths as large as females. Their 

 antennte are about one and two-fifths times as long as the head; there 

 appears to be less difl'erence in the length of anteimal segments than 

 in female; relative lengths of segments as follows: 



Abdomen about one and one-fifth times as broad as mesothorax; 

 tu))e al)out one-half as long as head and at middle about two-fifteenths 

 as bi'oad as middle of abdomen. 



Deseribed from nine males, all short winged. All of my males 

 were taken in September, and it may ))e that winged specimens occur 

 earlier in the season. 



Cotij2?e.—C^i. No. 0331, U.S.N.M. 



J-^ood plants. — Yncca fiianum torn., goldenrod. 



JL(l)itat. — Amherst, Massachusetts; Washington, District of 

 Columbia. 



Genus PHLCEOTHRIPS Haliday. 



Head somewhat longer than wide; cheeks with small warts, each 

 hearing a tiny spine. Intermediate antennal segments not particu- 

 larly elongated; the whole antenna less than twice as long as head. 

 Mouth cone as long or longer than its breadth at base and narrowed; 

 labrum sharply pointed at tip. Fore femur enlarged and tarsus 

 armed with a tooth. Wings not narrowed in middle, present in both 

 sexes. No scale at base of tube in male. 



