176 INSECTS AFFECTING DOMESTIC ANIMALS. 
THE LONG-NOSED Ox LovusE. 
(Hematopinus vituli Linn.) ~ 
In connection with the preceding species this louse, as already stated, 
has long been familiar to cattlemen; it has also been known to ento- 
mologists for a considerable time, but its history from the entomolog- 
ical side is not entirely clear. It seems to have been first technically 
described by Linnzeus under the name of Pediculus vituli, which name 
has been followed by Fabricius, Berkenhout, Stuart, and Turton, and, 
with the exception of the change in the generic name, by Stephens, 
Denny, and English and American authors generally. Nitzsch described 
it under the name of Pediculus oxyrhynchus, which name was Latinized 
by Burmeister to tenuirostris. This designation has been followed by 
Giebel and Piaget, but why the earlier name of Linnzeus was dropped 
we fail to discover. It seems more proper to retain the name given by 
Linneus. 
Denny describes and figures the species and says that it has been 
found only on the calf. Giebel also figures and describes it, giving a 
very characteristic figure, though deficient in some details. Piaget 
admits the species provisionally, but questions it being separable from 
eurysternus from the fact that descriptions have been based only on 
female specimens or on those in which the sex was not distinguished, 
and he seems to think it probable that immature specimens of eurys- 
ternus may have furnished the basis for this form.! 
From material in hand there can be no question whatever as to there 
being a distinct form corresponding with the descriptions above cited, 
and, while there are some details still to be cleared up, we propose to 
show as fully as possible the differences. While our material? does not 
include any specimen that can be recognized as a male, it does include 
enough specimens of the early stages and females of both this species 
and the eurysternus to entirely set at rest any question as to immature 
forms of eurysternus having been described as vitult or tenuirostris. 
In this species the body is about one-eighth of an inch long and not 
more than one-third of that in width (see fig. 101). The head is long 
and slender, the antenne set near the middle each side; tkere is but a 
very slight protuberance behind the antenne and no eyes visible. The — 
head sets well back into the thorax, forming an acute angle behind; — 
the thorax is longer than wide, and has a distinctly visible spiracle — 
above the second pair of legs; the abdomen is elongate, without chiti- 
1Since the preparation of this section and the figures illustrating the species I 
have seen the supplement to Piaget’s Les Pédiculines and find that he now admits 
this as a good species and gives a figure of the female, without, however, any special 
details of structure. 
2A series of parasites kindly loaned to me by Dr. A. W. Bitting, of Purdue Uni- 
versity, Indiana, contains a set of vituli among which I finda male. It agrees with 
females in general shape and external characters, except brushes, but is considerably 
smaller. Length, 1.75 mm.; width, 0.50 mm. 
