Mallophaga from Birds of Costa Rica, Central America 17 



INirmus marginellus N., pi. 11, fig. 4 



Giebel, Insecta Epicoa, p. 147. 



Piaget, Les Pcdiculincs, Sup., p. 21, pi. Ill, fij^. i. 



Female. — Body, leng-th 2.13 mm., width .74 mm.; head, length 

 .60 mm., width .60 mm. 



Male. — Body, length 1.90 mm., width .72 mm.; head, length 

 .56 mm., width .56 mm. This species is of the interrupto fasciati 

 type, and is distinguished by the shortness or rather by the width 

 of the head and body, the head being an almost perfect equilateral 

 triangle, while the abdomen is a perfect oval, a shape unusual 

 among this group ; the head is much darker than the body, being 

 a translucent reddish brown, with heavy chestnut antenna! bands ; 

 abdomen ver) pale with reddish fulvous lateral bands and very 

 faint golden transverse bands. 



Numerous males and females collected from Moinotns lessoni, 

 at Juan Vinas and Pozo Azul, Costa Rica, March and June, 1902. 



From Giebel's descr'^tion alone the species is unrecognizable, 

 but Piaget has thoroughly established it from specimens collected 

 on Prionites momota. 



My specimens agree quite closely with his descriptions and 

 plate with the exception of the head measurements of the male, 

 my specimen being smaller than the female, while he gives the 

 head measurements the same for the two sexes. It is possible 

 that he may have made an error in this point. 



Nirmus francisi sp. nov. , pi. II, fig. 5. 



Female. — Body, length 2.19 mm., width .63 mm.; absolutely 

 colorless, with bold markings of pitchy, and smoky brown on 

 head, thorax, and abdomen. 



Head, length .59 mm., width .52 mm. ; sharply conical from 

 trabeculae forward, with sides concave, and the narrow tip emar- 

 ginate ; three short, fine hairs along sides ; trabeculae medium, 

 colorless, equal to the last three, which are deep brown ; antennae 

 slender, first two joints longest, eye prominent, colorless, with a 

 short bristle, and slightly obscured by a pitchy ocular blotch ; 

 temples almost square, with rounded sides and angles, colorless 

 with one hair in the angle; occipital margin nearly truncate, occi- 



139 



