392 
Neir MaUophaga 
side of it, and four short hairs on the margin of the antennary fossa. 
The prosternum bears a group of about fifteen short spines. The first 
coxa has two spines anteriorly, and a group of hairs posteriorly. Meso- 
and metasternum each have a closely clustered group of hairs, and the 
second and third coxae have spinous anterior borders, and a cluster of 
hairs. The pleura of the abdomen bear on their ventral hind margin 
a row of a few spines; and each abdominal sternum carries two rows of 
hairs. 
Measurements in millimetres. 
s s 
Head . 
Prothorax. 
Mesothorax . 
Metathorax . 
Abdomen . 
Total length and 
greatest breadth 
Length 
Breadth 
0-22 
0-49 
0-14 
0-32 
0-07 
0-36 
0-07 
0-40 
0-57 
0-47 
1-07 
0-49 
Length 
Breadth 
0-22 
•57 
0-15 
•37 
0-07 
•45 
0-07 
•47 
0-72 
•54 
1-23 
•57 
One d, possibly not quite mature, and seventeen from the 
Grouldian grassfinch {Poejihila gouldiae), no locality given, N. C. Roth¬ 
schild collection. The host is found in northern Austraha, but is a popidar 
aviary bird. The material belongs to the Entomological Museum of 
the University of Cambridge; and was handed me for description by 
Mr Hugh Scott, M.A., Curator in Entomology. 
The affinities of the species are obscure. I know of no form with a 
gular plate of like character, or in any intermediate condition. 
Sub-order Ischnocera. 
Family Akidoproctidae, nov. 
Mjoberg (1910, p. 96) has already foreshadowed the erection of a 
family to include the genera Ornithobiiis Denny and Akidoproctus 
Piaget. With these must certainly be included Bothriometopus Taschen- 
berg. I have received from Mr G. F. Hill, Government Entomologist 
at Port Dar^vin, Northern Territory of Austraha, a number of examples 
of a form from the pied goose {Anseranas semipalmata), for which I 
propose below a new genus Heteroproctus. This form links up to such 
a remarkable degree the three genera mentioned above, that I have no 
hesitation in estabhshing a family for the reception of the group of 
genera. 
