352 
Mallophaga from Marsupials 
Measurements in millimetres. 
<? $ 
Head 
Length 
0-252 
Prothorax 
0-202 
Mesothorax 
0-040 
Metathorax 
0-185 
Abdomen 
1-001 
Total length and 
1-680 
greatest breadth 
Breadth 
Length 
Breadth 
0-420 
0-252 
0-437 
0-395 
0-210 
0-420 
0-269 
0-050 
0-302 
0-386 
0-200 
0-420 
0-790 
1-126 
0-890 
0-790 
1-838 
0-890 
From a wallaby, Macropus ualabatus, Victoria, Le Souef collection. 
The species falls into a small group within the genus characterised 
by the occurrence of spines upon the dorsal occipital margin. From the 
two other species of this group with which we are acquainted, B. grandis 
Piaget and an undescribed form, the present species may be distinguished 
by the simple, not double, eye, and by the absence of a spine in the 
metathoracic angle. 
Genus Heterodoxus Le Souef and Bullen. 
Le Souef and Bullen (1902, p. 159) established this genus for a 
parasite of “ kangaroos and wallabies.” Their type species, II. macropus, 
was shown by us (1912, p. 13) to be identical with the Menopon longi- 
tarsus of Piaget, a fact subsequently pointed out independently by 
Cummings (1913, p. 44) and Paine (1912, p. 360). Neumann (1912, 
p. 359) included H. longitarsus in his sub-genus Menacanthus; but sub¬ 
sequently (1913, p. 634) acquiesced in the generic distinction of Hetero¬ 
doxus. 
Heterodoxus is distinguished from Boopia by the presence of spines 
on the under side of the head; by the absence of a post-ocular emargina- 
tion, and by the acutely rounded temporal lobes. 
Several species have been described, all of which must, for the present, 
be referred to H. longitarsus , under which species they are discussed 
below. In addition to these, we are acquainted with two new species, 
which will be described in a later communication, both from marsupials, 
and with a third, which is described below. 
