BY T. H. JOHNSTON AND M, J. BANCROFT. 183 
Musca australis, Nob. Voyage autour du monde, de 
M. Leguillon. ¢ Fronte sublarga. 9 Cinerea. 
Thorace quadrivittata. | Abdomine nigro tessel- 
lato. Squamis flavidis. Nervo transverso cellulae 
discoidalis subrecto. (Tab. 20, fig. 10). 
Long. 31. 9. Semblable a la M. corvina; elle n’en 
differe que par les cuillerons un peu jaunatres 
au lieu de blancs, et par la nervure terminale de 
la cellule discoidale des ailes, qui est presque 
droite au lieu de sinueuse. 
Des iles Salomon et des iles Viti. 
Mate: Front etroit que dans le M. corvina. De plus, 
les mémes différences. specifiques que dans la 
femelle. 
De Hobart-Town, dans la Tasmanie, et de Vanoo, 
aux iles Viti. 
Un individu 9 alabdomen dépouillé de duvet. Une 
varicté du male a l’abdomen fauve seulement 
sur une petite partie des cotes. 
Une variété a l’abdomen fauve comme le male, avec 
une ligne dorsale noire. 
The general colour is lighter than that of the house 
fly*. The normal length of both sexes is 7 mm. When 
at rest the wings of the male lie obliquely in relation to 
the plane of the body, the costa being raised: those of 
the female Jie closer to the body. 
General habits. The flies} frequent cattle and horses, 
clustering round the eyes, mouth and nostrils, and any 
*To simplify comparisons we have taken as a standard description 
that given by Graham-Smith for Musca domestica, 1914, p. 19. 
For our drawings and descriptions of colouration we have examined 
specimens with the posterior region of the animal towards the light. We 
-deem it necessary to make this statement since if the insect be viewed 
with the light from the opposite quarter then very often the parts which 
were light coloured in the first instance become dark, and vice versa. This 
is particularly obvious in the case of the thoracic stripes but also holds 
good for certain other structures, including the frontal stripe and adjacent 
frons. 
+These flies may be parasitised by larval mites. a red one probably 
Acarus muscarum Linn. and also a minute whitish species. 
