. The Cambridge natural history. Zoology. 3 50 MALLOPHAGA chap. 221), which is said to have been figured by Eedi two hun- dred years ago under the name of Pulex cajn. This species multiplies to a con- siderable extent ; it is of very active habits, and passes readily from one bird to another, so that it is found on other species besides the domestic fowl. It is even said that horses kept near hen- roosts have been seriously troubled by Meno2307i pallidum, but it is suggested by Osborn that these attacks may per- haps have been really due to itch-mites. Fig. 221.âMenopon pallidum .â â, . , iij_
. The Cambridge natural history. Zoology. 3 50 MALLOPHAGA chap. 221), which is said to have been figured by Eedi two hun- dred years ago under the name of Pulex cajn. This species multiplies to a con- siderable extent ; it is of very active habits, and passes readily from one bird to another, so that it is found on other species besides the domestic fowl. It is even said that horses kept near hen- roosts have been seriously troubled by Meno2307i pallidum, but it is suggested by Osborn that these attacks may per- haps have been really due to itch-mites. Fig. 221.âMenopon pallidum .â â, . , inhabits the common fowl, There IS, howcver, no doubt that this aaiius domesticus. (After species may infest poultry, especially if Piaget.) . 1 1 â , mi 1 J Sickly, to an enormous extent. I he dust- baths in which poultry are so fond of indulging are considered to be of great use in keeping down the numbers of this Insect. A table of the birds and mammals on which Mallophaga have been found, toErether with the names of the latter, has been given by Giebel.^ The classification of the group, so far as the principal divisions are concerned, by no means accords with the kind of animals that serve as hosts, for the only two genera peculiar to quadrupeds (Trichodectes, Fig. 220 ; and Gyropus) belong to the two chief divisions of Mallophaga. The genus Menopon includes numerous species found on birds, and three or four others peculiar to mammals. Two very natural divisions, Philopterides and Liotheides, were adopted by Giebel and Nitzsch, but unfortunately the chief character they made use of for diagnosing the two groupsâthe presence or absence of maxillary palpiâwas illusory. Apparently the labial palps will serve the purpose of distinguishing the two divisions, they being present in the Liotheides and absent in the Philopterides. A table of the characters of the avicolous genera of these two groups is given by ; The Liotheides are more active Insects, and
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