V2 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
on Nothocercus nigrocapillus at Huacapistana, Peru, belonged to it, 
and a figure was published (pl. 7, fig. 4). At the same time the 
species S. subspinosus Carriker was described from the same host 
collected at Sandillani, Bolivia. A careful study of this material, in 
connection with an adequate series of a Strongylocotes taken on 
Nothocercus bonaparti, leads me to revise my former treatment of 
this group. , 
Unquestionably the two females taken on NV. nigrocapillus, at 
Huacapistana, Peru, cannot be called spinosus (Piaget), and it is 
equally certain that they are not subspinosus Carriker, although they 
are conspecific with both. A review of all the material of Stron- 
gylocotes taken on the different species of Vothocercus shows that they 
are all conspecific with 8. spinosus (Piaget) but represent various 
well-marked subspecies. 
The specimen of Vothocercus shot at Huacapistana (central Peru) 
is an intermediate between typical nigrocapillus of Bolivia and J. 
nigrocapillus cadwaladeri of north Peru, closer, perhaps, to the latter, 
which would readily account for the differences between the parasites 
on the central Peru and Bolivian hosts. 
The figure of S. subspinosus published in “The Lice of the Tina- 
mous” (pl. 8, fig. 2) is misleading in numerous details, especially in 
the pterothorax, the chaetotaxy of the abdomen, and the abdominal 
plates, especially in the first segment and the metathoracic apron. 
It is now clearly evident that not only the types of subspinosus 
but the entire type series have the posterior angle of the pterothorax 
either doubled under or crumpled in a manner that completely dis- 
torts the shape of that segment. In reality the pterothorax is of the 
same shape as that of spenosus (the principal character on which the 
specific distinction was based), a fact amply proved by the series from 
Nothocercus bonaparti, some of which also have the angles doubled 
under while others are of the normal shape. All these forms of 
Strongylocotes from the avian genus Nothocercus have the same 
general shape of head, thorax, and abdomen, especially the terminal 
segments, in both sexes, all splendid characters for separating the 
species of this genus, and so it would seem a more rational proceed- 
ing to make them all conspecific, and subspecies of spinosus. 
The following arrangement of the various known forms of the 
spinosus group is therefore proposed : 
STRONGYLOCOTES SPINOSUS SPINOSUS (Piaget) 
Goniodes spinosus PiAcET, Les Pédiculines, p. 261, pl. 21, fig. 7, 1880. (Host: 
Nothocercus [Tinamus] julius.) 
This race is known at present only from the figure and description 
of the female as given by Piaget and Taschenberg, which, so far as 
