1913] Paine and Mann — Mallophaga from Brazilian Birds 21 



Physostomum sucinaceum Kellogg. 



Two specimens, one immature, from Elarnia flavogaster Thunb. 

 (Marajo, Brazil, Nov. 1911). 



Trochiloecetes gen. nov. 



In general habit resembling Physostomum, except that the sides 

 of the head are deeply emarginate. These lateral emarginations 

 give the head a constricted appearance, the anterior portion form- 

 ing the somewhat rectangular clypeus and the posterior portion 

 comprising the temples and occiput; temples not produced back- 

 ward; palettes present. Prothorax more rounded than in Physos- 

 tomum, with the posterior margin convex. Metathorax showing 

 no sign of a mesothoracic suture, broad, appearing as the first 

 abdominal segment. Abdomen elliptical, with two pale, sub- 

 marginal bands, as in Physostomum; last segment rounded. The 

 members of this genus are peculiar to humming-birds, the three 

 known species, which are closely related, having been taken from 

 these hosts. The type of the genus is Physostomum prominens 

 Kellogg and Chapman. 



Included Species. 



Trochiloecetes prominens Kellogg and Chapman. 



Physostomum prominens Kellogg and Chapman, New Mallophaga. III. Occ. 

 Papers California Acad. Sci. VI. p. 137. (1899). 



From Calypte costoe, Costa's Humming-bird (Ontario, Call" 

 fornia). 



Trochiloecetes doratophorum Carriker. 



Physostomum doratophorum Carriker, Univ. Studies, Nebraska, Vol. III., No. 

 2, p. 43. (1903). 



From Selasphorus flammula (Volcano Irazu, Costa Rica). 



Trochiloecetes emeliae sp. nov. (Fig. 5). 



A single female specimen from Thalurania furcatoides Gould 

 (Obidos, Brazil, Feb. 1912). This species closely resembles 

 T. doratophorum Carriker, but is much smaller in size, measuring 

 2.10 mm. long and .86 mm. wide, while the latter species measures 

 2.41 mm. in length by 1.10 mm. in width. The present species 

 also differs in the shape of the head, having larger temples. 



