March, i 9 o6.j Kellogg : Mallophaga from Argentina. 47 



dark brown markings ; temporal margin rounded instead of angulated as usual in this 

 genus. 



Head, length .4 mm., width .47 mm. ; front narrow, rounded, with eight spines ; 

 antennae in shallow emargination with first segment stout and longest, second segment 

 almost as long as first, third, fourth and fifth subequal ; temporal margin flatly rounded 

 with one long hair and four prickles ; occipital margin concave in middle, with two 

 spines and one long hair in the posterior angle ; pale yellow with golden yellow nar- 

 row marginal frontal bands ending posteriorly on each side in an expanded dark brown 

 spot inside of antennal emargination ; mandibles and oesophageal sclerite dark brown ; 

 eyes flatly convex with two spines ; an irregular, brown ocular blotch behind the eyes. 



Prothorax very narrow, about one half of the width of the head, almost quad- 

 rangular ; posterior margin flatly convex ; one long hair in posterior angle ; posterior 

 angles dark brown. Metathorax with blunt lateral angles, each middle of lateral 

 margin with one spine ; posterior angles with two hairs ; posterior margin obtusely 

 angled on abdomen, and bearing six long hairs. Legs rather small, pale ; claws pale 

 brown. 



Abdomen elongate elliptical, segments I to 4 with one short hair in posterior 

 angles, segments 5 to 8 with two long hairs in posterior angles ; dorsal surface with 

 four long hairs in transverse series on each segment near posterior margin ; ground 

 color whitish with distinct narrow lateral bands, darkest on anterior segments, distinct 

 transverse blotches, each, with a clear stigmatal spot in center, in segment 1 to 7 are 

 separated by a transparent white median space ; segment 8 wholly colored, segment 

 9 with very weak rounding emargination on posterior margin. 



Male. — Body, length 1.3 mm., width .5 mm. ; head, length .33 mm., width 

 .43 mm, first antennal segment very large ; abdomen broadest at segment 5 ; elongate- 

 oval ; segments 1 to 7 with entire transversal abdominal bands, segments 8 and 9 

 wholly colored ; genitalia distinct, barely chitinized, dark brown in color. 

 Colpocephalum guiratnsis, new species (PI. ii, Fig. 4). 



Males and females from Guira guira (Argentina) . 



Description of Female. — Body, length 2.7 mm., width I mm. ; pale yellow with 

 brown border on the thorax ; prothorax small. 



Head, length .41 mm., width .73 mm., semilunar with flatly-rounded front, 

 shallow ocular emarginations, and rounded posterior angles ; occipital margin con- 

 cave ; palpi projecting by the length of the last segment, the antennae when out- 

 stretched also projecting beyond the margin of head by the length of the last seg- 

 ment ; two pairs of spines in the middle of front, one short hair on side followed by 

 two long ones ; the ocular fringe composed of many short prominent hairs ; temporal 

 margin with three long and about half a dozen short hairs ; occipital margin concave, 

 bare ; a small, black ocular fleck ; the mandibles black-tipped. 



Prothorax small, shorter than broad, lateral angles obtuse, produced, and with a 

 long hair and spines ; on rounded posterior margin a row of long hairs ; color pale 

 brown with brown lateral borders. Metathorax, sides with many short spines ; pos- 

 terior angles with two strong hairs ; posterior margin with a row of spiny hairs, an- 

 terior angles brown. Legs, large and concolorous with body. 



Abdomen broadly elliptical, one long hair and several spines in each posterior 

 angle, and a series of many short hairs along posterior margin of each segment ; color 



