Mallophaga from Birds of Cosfa Rica, Central America 65 



of segments with a row of longish, slender hairs ; ninth segment 

 large, rounded posteriorly, with two long hairs on each side 

 and a doiihle fringe of very fine hairs on the tip ; lateral hands 

 broad, deep, smoky brownish, ending with the eighth segment ; 

 very dim, brownish, transverse bands on segments three to eight, 

 separated from lateral bands by a clear place, and from each 

 other by clear sutures; ninth segment dusky in lateral portion, 

 tip clear. 



Malr. — Body, length t.oo mm., width .37 mm.; head, length 

 .28 mm., width .37 mm., the head of the male being but slightly 

 diflferent from the female, wdiile the abdomen is much smaller 

 and slightly darker in color; genital hooks large but simple, re- 

 sembling more the common form of the Colpocephali. 



Numerous specimens of a Menopon were collected from Ca- 

 tharns gracilirostris, ChloropJwnia callophrys, and Piranga bi- 

 dcnta sanguinolcnta on the volcano Irazu, Costa Rica, April. 

 1902. These specimens can be referred, without doubt, to tho- 

 racicuiii. Giebel's description is, for the most ])art, quite com- 

 prehensive, and every point which he mentions agrees w'ith this 

 form. A detailed description, together with plate, is given in 

 order to thoroughly establish the s])ecies. 



Menopon thnracicum var. majus var. nov. 



The female measures: length 1.72 mm., width ./T, mm'.; head, 

 length .38 mm., width .56 mm. 



One female was collected from Mcrula grayi and one female 

 from Tanagra caiia, at Juan Vinas, Costa Rica, March, 1902, 

 which agree very closely with the species, except that they are 

 paler and much larger. 



Menopon thoracicum, var. fuscum var. nov. 



This variety measures practically the same as the species, the 

 variation l)eing the pale brown color of the entire body, instead 

 of light golden, with markings of head and thorax and abdomen 

 a deep clear brown ; in the si)ccies the transverse bands of the 

 abdomen are very faint or wanting, while here they are very 

 noticeable, being pale on segments one and two but darkening" 

 backward and almost uniting on the last four segments to form 



187 



