Vol. xxv] ENTOMOLOGICAL NEWS 195 
The last genus to be established for the reception of one of 
these two-clawed mammal-infesting species is Trimenopon, 
containing the single species T. echinoderma, described by 
Bruce Cummings (Bull. Ent. Research, May, 1913) from speci- 
mens (males and females) taken from the wild guinea pig, 
Cavia aperea Erxleben, at Villa Rica, Paraguay, in November, 
1910, F. Posner, coll. As our new species from the vizcacha, 
not assignable to any known genus, is also South American, 
and also resembles both Menopon and Trinoton in general 
habitus, and is also strongly spiny, our first thought was that 
it might be referable to Cummings’ new form. But it is not 
at all possible to assign it thus. It is not only different in 
species but different in genus from Trimenopon echinoderma, 
despite some slight resemblance in superficies. What is pos- 
sible, and necessary, however, in the light of the establishment 
of the new genus Trimenopon, is to call attention to the fact 
that, if this genus is to be accepted as distinct from Menopon 
—and we do not suggest that it should not be—a species de- 
scribed by Kellogg and Paine in 1910 (Entomological News, 
vol. 21, pp. 461-462), under the name Menopon jenningsi, 
from specimens taken from the domestic guinea pig, Cavia 
cobaya, by Mr. A. H. Jennings, in the Canal Zone, Panama, 
must be assigned to this new genus. And, besides, there 
should be made a careful examination of the two species, to 
see if they are not identical. The descriptions and figures as 
given by the authors of the species are certainly much alike. 
The principal difference seems to be in the measurements, 
echinoderma being larger than jenningsi by one-third. If the 
two species are one, then their (its) name is Trimenopon jen- 
ningsi. 
A special point of interest in connection with the two-clawed 
mammal-infesting Mallophaga: is their obvious tendency, de- 
spite their otherwise plainly Amblyceran affinities, to have 
5-segmented antennae, which is a prime characteristic of the 
other Mallophagan sub-order, the Ischnocera. The antennae 
of Boopia, Heterodoxus, Latumcephalum and, now, Trimeno- 
pon, are all described as 5-segmented, instead of 4-segmented, 
