128 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 95 
male being unknown. Since that time I have taken the male, not 
only on the host of the genotype but also on other species of 
Nothoprocta, but as yet it has not been taken on any other genus. 
The additional generic characters that it is necessary to add to 
the original description are as follows: Antennae dimorphic, the first 
segment being lengthened and swollen, the second longer than in 
the female, while the third has a shght hook on the inner side at 
the distal end; male genitalia simple, resembling very much those of 
Megaginus (see fig.); the female is considerably larger than the 
male. 
The new material of this genus presents a most interesting fact 
concerning the distribution of the two species originally described 
as belonging to it, viz: C. extraneus and C. secundus. At the time 
of describing them I was uncertain as to whether the two forms were 
conspecific, but the new material proves conclusively that the two 
are distinct species, since I have taken both species on the same 
individual host. Very few cases among the tinamous are now 
known where two closely related species of the same genus of parasite 
are found together. One instance is found where two species of 
Rhyncothura have been taken on the same host, and another is the 
remarkable distribution of Heptapsogaster mandibularis, H. tem- 
poralis, and H. inexpectata. 
CUCLOTOCEPHALUS EXTRANEUS Carriker 
Cuclotocephalus extraneus CARRIKER, Lice of the tinamous, p. 101, pl. 6, figs. 1, 1a, 
1936.4 (Host: Nothoprocta branickii.) 
No more specimens of this species have been taken on the type 
host since 19386, but I now have a large series of both sexes from 
Nothoprocta p. pentlandi, taken at Choros, Bolivia, and one male 
from same host taken at Oploca, Bolivia, which bird host is the 
type host for C. secundus,; also another female from Mothoprocta 
ornata subsp., Incachaca, Bolivia. 
The above series presents clear-cut characters for the easy separa- 
tion of extraneus and secundus, which are as follows: C. extraneus 
may be distinguished by its large size, much wider head, and the 
type of paratergal plates, which are well outlined on the inner 
side (in secundus they are completely fused with the tergites and 
the line of suture invisible), much more deeply chitinized, and with 
a darker-colored band along the outer margin, which is twice as 
wide as in secundus. 
The specimens of this species taken on J. p. pentlandi prove to be 
subspecifically distinct from typical extraneus and are described 
below. 
4The published figure of extraneus does not give a true conception of the markings of 
the paratergal plates. 
