138 



BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



The generic ratio has been obtained from measurements of the 

 females of the three species, the ratios being between the following 

 dimensions: (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)::-:l. 



(4):(3)::-:l. 



(5):(4)::-:l. 



(5):(2)::-:l. 





5.11 



4.66 

 5.09 



4.44 

 4.00 

 4.90 



1.15 

 1.16 



1.03 



1.64 





1.61 





1.33 









4.66-5.11 



4.00-4.90 



1.03-1.16 



1.33-1.64 







i. LEIONOTOXENOS JONESI, new species. 



Host. — Leionotus colon Cresson (det. W. H. Ashmead) ; Mound, 

 Louisiana, May 12, 1905, C. R. Jones, collector; Kerrville, Texas, 

 June 2, 1906, F. C. Pratt, collector (pi. 11, fig. 3). 



Female. — Length of cephalothorax 1.04 mm., breadth 1.01 mm., 

 breadth of head 0.91 mm., distance between mandibles 0.19 mm. 

 Cephalothorax light brown, with lateral margins narrowly darker, 

 spiracles light on dark background; broadly oval, constricted at 

 base, widest just behind spiracles, obliquely convex to apex; spiracles 

 dorsal; mandibles armed with long tooth at inner apical angle. 



Type.— Cat. No. 10123, U.S.N.M. 



Named in honor of the writer's former associate, Mr. C. R. Jones, 

 who has materially assisted in this work. 



2. LEIONOTOXENOS LOUISIANA, new species. 



Host. — Leionotus vagans Saussure (det. TV". IT. Ashmead) ; Mound, 

 Louisiana, May 12, 1905, C. R. Jones, collector; Lincoln, Nebraska, 

 July (pi. 11, fig. 4). 



Female. — Length of cephalothorax 0.87 mm., breadth 0.91 mm., 

 breadth of head 0.76 mm., distance between mandibles 0.19 mm. 

 Cephalothorax brown, lighter on disk basalry, and in front of mouth, 

 darker on lateral margin, spiracles light on dark background; very 

 broadly oval, narrowed from spiracles to base, convex from spiracles 

 to apex; spiracles laterally prominent; mandibles very short and 

 broad, armed with short tooth at inner angle. 



Triungulinid : Length 0.16 mm., length including stjdets 0.22 mm., 

 breadth of head 0.04 mm., greatest breadth 0.08 mm., breadth ninth 

 abdominal segment 0.04 mm. Head elongate, abdominal segments 

 1-8 short, but normal; ninth segment elongate, as long as three pre- 

 ceding, deeply emarginate for tenth; tenth segment hardly surpassing 

 the lateral prolongations of the ninth, apically provided with two 

 contiguous stylet bearing lobes. 



Type.— Cat. No. 10124, U.S.N.M. 



