March, 1906.] KELLOGG '. MALLOPHAGA FROM ARGENTINA. 49 



color pale with dark brown margin and darkish-brown longitudinal blotches separated 

 from each other by a narrow uncolored space. Metathorax longer than wide, lateral 

 margin with many spine-like hairs ; a transverse row of pustulated hairs near poste- 

 rior margin ; lateral margin dark brown, two subtriangular blotches separated from 

 each other by a narrow median uncolored line ; anterior corners black -brown. Legs 

 very large, distinctly marked. 



Abdomen, large, lanceolate in form, one or two long hairs on the postero-lateral 

 angles of each segment ; and short hairs along lateral margins ; a row of postulated 

 hairs on the posterior margin of each segment ; marginal bands dark chestnut brown 

 and two quadrangular blotches narrowly but distinctly separated from each other and 

 more widely from the lateral bands by uncolored space ; posterior margin of the last 

 abdominal segment pointed. 



Male. — Body, length 5.5 mm., width 1. 5 mm. ; head, length I mm., width 1. 05 

 mm. ; abdomen slenderer than in the female, last segment parabolic in form with sev- 

 eral weak hairs along the margin ; clear space down the median line separating the 

 abdominal blotches, not so distinct as in the female, and wanting in the last three 

 segments. 

 Menopon argentinus, new species (PI. ii, Fig. 7). 



Females from Chrysomitris icterica (Argentina). 



Description of Female. — Body, length 1.2 mm., width .43 mm. ; pale yellow, 

 head and thorax slightly darker ; abdomen with pale brown transverse blotches. 



Head, length .27 mm., width .35 mm. ; semilunar with evenly rounding front, 

 shallow ocular emarginations with rounded posterior angle; occipital margin concave ; 

 palpi projecting by the length of the last segment ; a pair of minute hairs in middle of 

 front, a longer one on side followed by a very short one, and then three long ones in 

 front of the emargination ; the ocular fringe composed of rather strong hairs ; temporal 

 margin with three long hairs, two more on occipital margin of the produced temples ; 

 two long hairs along middle of the occipital margin ; a small, black, ocular fleck and 

 dark brown ocular blotch. 



Prothorax subquadrangular, posterior margin convex with six longish hairs, and 

 three spines along middle of the lateral margin ; latero- posterior corners angulated. 

 Meso- and metathorax fused, although the line of fusion is marked by a lateral 

 emargination and by an indicated transverse suture ; posterior angle with one long 

 hair and three spines ; the straight posterior margin with four marginal hairs. Legs 

 stout, with dark brown marginal markings. 



Abdomen obovate in form, widening posteriorly to segment 3 ; segment 4 a little 

 narrower than segment 3, and segment 5 and 9 narrowing more rapidly ; segments I 

 to 7 with two or three long spines on lateral margin ; with pale brown lateral bands 

 and very pale transverse blotches. 



Explanation of Plate II. 



Fig. 1. Lipeicnts bergi Kell. 



Fig. 2. Lipeurus argentinus Kell. 



Fig. 3. Goniocotes abnormis Kell. 



FlG. 4. Colpocephalum guiransis Kell. 



Fig. 5- Colpocephalttm bnrmeisteri Kell. 



Fig. 6. L&mobothrium caracarmnsis Kell. 



Fig. 7. Menopon argentinus Kell. 



