198 PROCEEDINGS OF THE NATIONAL MUSEUM. 



lahlnni. Anteiiniv twice as long as width of head; rehitivc lengths of 

 segments as follows: 



1 2 3^ 4 5 6 T o 

 10 11 22 21 IT 11 13 8.5 



Color of antenna' brown with bases of three, four, five, and six 

 decreasino- in area and intensity of yellowish ness; sense cones about 

 one-third the length of segment three; spines quite long, dark, and 

 conspicuous. 



Prothorax only five-sevenths as long as head, and to outer angles of 

 fore coxtt^ slightly more than twice as wide as long; usual prothoracic 

 s])iiies present, quite long and knobbed, Mesothorax as wide as width 

 across fore coxse, closely joined with prothorax; pterothorax very 

 compact, sides converging slightly to base of abdomen. Wings long 

 and powerful. Legs quite strong; fore femora nuich thickened, over 

 one-half as Inroad as head; fore tarsi armed with a small tooth. Color 

 of legs uniformly gray-brown; tarsi somewhat lighter; fore tibiae yel- 

 lowish, shaded with brown at bases and on top. 



Abdomen less than twice as broad as head, equal in width to meso- 

 thorax, nearly cylindrical to eighth segment; eighth and ninth taper- 

 ing abruptly to base of tube. Tube only two-thirds as long as head; 

 sides straight, tapering somewhat; breadth in middle about one-eighth 

 that of middle of al)domen; terminal hairs a little longer than tul)e. 

 All large spines on body, except those on hind edge of nine and at tip 

 of tube are short and knobbed; those on nine and tube are acute. 

 Color of abdomen pale ])rownish yellow, lightest in middle; blood- 

 red pigmented tissue confined mostly to sides of abdomen in this 

 specimen. 



Described from one female. 



Male unknown. 



J^ood plant. — Taken on grass. 



llahltat. — Amherst, Massachusetts. 



I name this species for Mr. Theodore Pergande, by whom several of 

 our native species have been described. 



Genus ACANTHOTHRIPS Uzel. 



Head somewhat longer than wide; cheeks with spine-bearing warts. 

 Antemne very nearly twice as long as head; intermediate segments 

 elongated and bearing very long sense cones. Mouth cone consider- 

 ably longer than its l)readth at base and quite slender. Fore femora 

 enlai-ged in both sexes and with one or twH) teeth at tip within; tarsus 

 armed with a stout tooth (Uzel says the tooth is weaker in the male 

 than in the FeniMlc). Wings present in both sexes. No scale at base 

 of tube in the male. 



