196 ENTOMOLOGICAL NEWS [May, °14 
as one would expect to find them. It is true, however, that 
there is a division of the third antennal segment into two seg- 
ments in the case of several undoubted species of the large and 
rather heterogeneous genus Menopon, which is the old genus 
—old in point of priority of establishment by students of the 
group—to which the new genera are most nearly related. It 
should be added that it is not easy to determine accurately, or 
to interpret confidently, the exact condition of the antennae 
as regards number of segments. The suture dividing the third 
segment into two, thus increasing the number from four to 
five, may be so faint as to be capable, under different eyes, of 
seeming to be distinct enough to be accepted as actual suture, 
or of not being so accepted. In the case of the new genus 
which we have to establish for the reception of one of our new 
Mallophagan species from the vizcacha, we give four as the 
characteristic number of segments. Four is certainly the cor- 
rect number for the type species of the genus. . We have gone 
to much pains to ascertain this. 
As a matter of fact the whole subject of the Mallophagan 
parasites of mammals, especially the subject of the two-clawed 
species, needs careful working over. 
The description of the new species follows. 
Gyropus alpinus n. sp. (Plate VIII.) 
A rather large species, unusually hairy, elongate, and belonging to 
that group of Gyropus species with fore legs and feet smaller than and 
different from the other two pairs. A pair of prominent laterally pro- 
jecting lobes on the prothorax, well developed clinging pads on the 
femora of second and third legs, and the length and irregular arrange- 
ment (not in the usual one or two regular transverse rows) of the 
numerous long hairs on the dorsal surface of the abdomen, especially 
distinguish the species. General color pale yellowish brown, with 
thorax darker, and an incomplete darker line running sub-marginally 
around the head. 
Male (PL VIII, a).—Length of head .29 mm., thorax .40 mm., ab- 
domen 1.02 mm., total 1.71 mm.; width of head .37 mm., thorax .32 mm., 
abdomen .66 mm. Female.—Length of head .29 mm., thorax .43 mm., 
abdomen 1.25 mm.; width of head .36 mm., thorax .37 mm., abdomen 
72 mm. 
Head of both male and female wider than long with well expanded 
squarish temples, antennae (Pl. VIII, b) concealed in deep lateral fos- 
