REVISION OF STREPSIPTERA PIERCE. 139 



3. LEIONOTOXENOS HOOKERI, new species. 



Host. — Leionotus verus Cresson (det. W. H. Ashmead) ; Dallas, 

 Texas, July 21, 1906, on Helenium tenuifolium; W. A. Hooker, 

 collector (pi. 11, fig. 2; fig. 1, p. 31). 



Female. — Length of ceplialothorax 1.21 mm., breadth 1.37 mm., 

 breadth of head 1.17 mm., distance between mandibles 0.19 mm. 

 Ceplialothorax brown, lighter basally on disk, much darker on lateral 

 margins; broader than long, constricted at base, angularly convex 

 from spiracles to apex, the angles being at base of head, at sides of 

 mandibles, and in front of mandibles; spiracles dorsal; mandibles 

 broad, apically emarginate with tooth on inner angle. 



Triungulinid : Length 0'.21 mm., length including stylets 0.28 mm., 

 breadth of head 0.07 mm., greatest breadth 0.09 mm., breadth with 

 abdominal segment 0.05 mm. 



Type.— Cat. No. 10125, U.S.N.M. 



Named in honor of the writer's associate, W. A. Hooker, who 

 collected the types. 



15. MONOBIAPHILA, new genus. 



Name derived from Monobia + (J) 'da (loving), meaning fond of 

 Monobia. 



Type of genus. — Monobiaphila bishoppi, new species. 



The genus is parasitic on the odynerid genus Monobia, which is 

 broadly scattered over the United States. The form of the female 

 shows it to be xenid and closely related to Leionotoxenos. 



Only one species is known, bishoppi Pierce, parasitic on Monobia 

 quadridens Linnaeus; Texas. 



The generic ratio is obtained, therefore, from this one species: (2) = 

 distance from line between spiracles to apex, (3) = distance between 

 mandibles, (4) = breadth at base of head, (5) = breadth at spiracles. 



Species. 



(5): (3): 



— :1. 



(4): (3): 



— :1. 



(5): (4): 



— :1. 



(5):(2): 



— :1. 



bishoppi 



6.93 



4.40 



1.60 



1.76 



I. MONOBIAPHILA BISHOPPI, new species. 



Host. — Monobia quadridens Linnaeus; collected at Wolfe City, 

 Texas, May 31, 1906, and at Orange, Texas, August 23, 1906, by 

 F. C. Bishopp (pi. 11, fig. 1). 



Female. — Length of ceplialothorax 1.78 mm., breadth at spiracles 

 1.86 mm., breadth of head 1.48 mm., distance between mandibles 

 0.34 mm. Cephalothorax brownish, light on disk to line between 

 posterior angles of head, dark on margins and front of prothorax, 

 light in front of mouth and mandibles ; broader than long, constricted 

 at base, broadest at spiracles, convex from base to spiracles, slightly 



