NO. 1310. NOHril AMERICAN THYSANOPTERA— HINDS. 145 



ments short, weak, and not strong-ly radiating. Segments two to seven 

 marked with a very prominent dark-bi'own cro.ss line at anterior third 

 of each; on each side of these segments behind this line is a more or 

 less extensive brown shading which on seven extends clear across the 

 back; ground color of these segments is white or pale yellowish gray; 

 eight, nine, and ten are without the brown markings, and are pale or 

 dusky yellowish. 



J/rt/ J.— Similar to female with the following exceptions: Length 

 0.64 mm.; width of thorax 0.19 mm.; abdomen only four-fifths as 

 wide as thorax, and more than twice as long as wide, nearly cylindrical 

 to seventh segment; eight to ten conoid; spines upon last segment 

 short; the testes large and brownish orange. 



Relative lengths of antennal segments: 



Var. a. female— Rq'<x(\. and front third of prothorax clear, pale yel- 

 low; pterothorax darker yellow; hind part of prothorax and metano- 

 tum abruptly brown; abdomen pale yellowish with very conspicuous 

 dark brown cross-streak at lirst third of segments two to seven; on 

 e-ach side behind this streak is a narrow brown shading which upon 

 seven extends clear across the back. Fore wings slightly tinged with 

 yellowish, darkest at base. Brown spot on femora above, darkest on 

 hind femora. Abdomen acute ovoid. 



Food 2>lants.—C\mi2ith, clover, elm, hackl)erry. 



TIahitat. — Iowa, Massachusetts. 



^' Var. I. male and female.— Body pale yellowish, immaculate; apical 

 joints of antenme black, remainder pale; wings and fringes tinged with 

 yellowish.-' — Beach. 



Food ijlanU. — Hawthorn, hackberry . 



Hah It at. — Iowa. 



''Var.c. male and female.— Y^'w/h nearly uniformly fuliginous; 

 last three joints of antenna^, distal half of joints 4 and 5 black, some- 

 times intermediate altogether dusky; brown markings very distinct, 

 confined to two large spots on thorax and scutellum respectively, the 

 latter oblong and approximating posteriorly; abdomen immaculate." 

 Beach." 



Food plants. — Hawthorn, hackberry. 



Ilahltat. — Iowa. 



" Var. d. male and female.— This variety is characterized by having 

 the wings fuliginous, trifasciate with white bands, and in being more 



a I have seen and studied the specimens of Miss Beach labeled " Thrips variabilis 

 Beach, Var. c. male and female types." These specimens seem to me to tit much 

 better her description of ' ' Var. d. ' ' An emended description based upon these speci- 

 mens would not be distinguishable from the foregoing description of "Var. d." 



Proc. N. M. vol. xxvi— 02 10 



