14 BULLETIN 746, TJ. S. DEPARTMENT OF AGRICULTURE. 



III above the spiracle on abdominal segments 1 to 7, before the spiracle on 

 abdominal segment S ; Ilia rudimentary or indistinguishable, before the spiracle 

 on abdominal segments 1 to 7, ventro-cephalad of the spiracle on abdominal 

 segment 8 ; group VII trisetose on abdominal segments 3 to 7, unisetose on 

 abdominal segments 8 and 9 ; abdominal segment 9 bearing six prominent setae 

 in a nearly vertical line, I rudimentary or absent, when distinguishable it is 

 latero-cephalad of II and equidistant from II and III ; on the other abdominal 

 segments II is slightly shorter than, and latero-caudad of I ; seta? and punc- 

 tures on prothoracic shield as follows : la, b, c behind the frontal margin of the 

 shield, distance separating I& and Ic equal to that between Ila and II&, 

 Ila dorso-caudad of la, puncture z slightly lower than the level of II&, punc- 

 tures x and y dorso-caudad of la, distance between Ic and lie slightly less than 

 that between 16 and Ic. 



Head capsule (PL IV, figs. 2, 4) spherical, slightly trapezoidal or broadly 

 oval (nearly square) in outline viewed from above, as wide or a trifle wider 

 than long; greatest width back of middle of head; incision of dorsal hind 

 margin slight; distance between dorsal extremities of hind margin less than 

 one-half the width of the head. Frons (FR) a trifle longer than wide, not quite 

 reaching to middle of head; adfrontal ridges (ADFR) parallel from lower limit 

 of epistomal area to point of juncture of tentorial arms, thence converging in 

 slightly curved lines to the longitudinal ridge (LR) ; longitudinal ridge slightly 

 longer than frons: adfrontal sutures (ADFS) meeting longitudinal ridge 

 slightly behind middle of head. Projection of dorsal margin over ventral less 

 than one-half the diameter of the head. 



Ocelli six (PL IV, fig. 4) ; I larger and III smaller than the others; III and 



IV closer together than any of- the others. 



Epistoma (PL IV, figs. 2, 4) with the normal seta? (E 1 , E 2 ). 



Frontal punctures (PL IV, figs. 2, 4) (F a ) well separated; distance between 

 punctures considerably greater than distance from puncture (F a ) to seta (F 4 ) ; 

 distance from frontal seta (F 1 ) to seta Adf 1 about equal to distance separating 

 adfrontal setae (Adf 1 and Adf 2 ) ; Adf 2 well behind beginning of longitudinal 

 ridge; puncture Adf equidistant from Adf 1 and Adf 2 and approximate to 

 beginning of longitudinal ridge. 



Epicranium (PL IV, figs. 2, 4) with the normal number of primary setae and 

 punctures and with three ultraposterior setae and one or two ultraposterior punc- 

 tures. Anterior setae (A 1 , A 2 , A 8 ) in a right angle ; A 2 equidistant from A 1 and A 3 ; 

 anterior puncture posterior to A 2 . Posterior setae (P\ P 2 ) and puncture (P b ) 

 of posterior group lying parallel with longitudinal ridge; P 1 nearly on a level 

 with beginning of longitudinal ridge ; P 2 on, or nearly on a level with place of 

 juncture of adfrontal sutures with longitudinal ridge; P b between P 1 and P 2 ; 

 P a slightly nearer to L? than to any other seta, lying between L 1 and P\ 

 Lateral seta (L 1 ) remote from A 3 , on a level with P 1 ; lateral puncture (L a ) 

 directly posterior to the seta, remote. Ocellar setae (O 1 , O 2 , O 3 ) well separated; 

 O 1 equidistant from and ventrad of ocelli II and III ; O 2 directly ventrad of and 

 approximate to ocellus I ; O 3 remote from and ventrad of O 2 , nearer to SO 3 than 

 to O 2 ; puncture O" closely approximate to ocellus VI. Subocellar seta± (SO 1 , 

 SO 2 , SO 3 ) triangularly placed ; puncture SO a equidistant from setae SO 2 and SO 3 . 

 Genal puncture (G a ) anterior to seta (G 1 ). 



Lairum (PL IV, fig. 5) with median incision moderately concave; seta? 

 M\ M 2 , and M 3 triangularly placed; M 1 and M 2 nearly on a line with La 1 ; 

 La 1 and La 2 closely approximate; M 3 and La 8 on a line; distance separating 

 M 3 and La 3 about equal to that between M 2 and M 8 ; puncture equidistant from 

 and slightly back of M 1 and M 2 . 



