NEW MALLOPHAGA. 49 



reviser. In tlie case of the two species here described, 

 tlie uiirehited hosts accredited to each suggest that we 

 have to do in this genus witli a few species of wide 

 range of host, ur with many species of very similar ap- 

 pearance. 



Physostomum pallens n. sji. (Plate IV, fig. 7). 



Specimens from a Prothonotary Warbler, Frotono- 

 iaria citrea and from a Flycatcher, Elainea subpagana 

 (Panama). 



Description of female. Body, length 3.6 mm., width 

 ,87 mm.; pale buffy brown, with blackish brown head 

 markings and thoracic markings and lateral abdominal 

 bands. 



Head, length .67 mm., width .66 mm.; front slightly 

 expanded, flatly rounded; with laterally projecting pal- 

 ettes; several short prickle-like hairs in the slight ocular 

 emargination; temples projecting backward, acute, with 

 three long hairs, one on margin just behind the eye, 

 and two close together on dorsal surface near the mar- 

 gin farther back; color whitish to clear with usual 

 brown longitudinally arranged lateral blotches. 



Prothorax hexagonal, front and posterior margins 

 concave; a long hair and two spines in each lateral 

 angle, and a long bair and two or three spines on each 

 lateral margin near the posterior angles; lateral mar- 

 gins unevenly bordered with blackish brown, inter- 

 rupted by a nearly uncolored spot in each lateral angle. 

 Metathorax longer than prothorax, with straight pos- 

 terior margin, and a single hair and spine in each pos- 

 terior angle; a slight, rounded swelling behind anterior 

 angles bearing spines; blackish brown, narrow, even, 

 submarginal, longitudinal bands. Legs uncolored. 



4 



