GENUS PHILAEMATOMYIA 355 



In a very short time several of the females will alight on it and 

 commence laying their eggs. When a number of eggs have been laid 

 the tray should be taken to the laboratory and a quantity of sand placed 

 around the dung ; it should be placed in the sun for a short time each 

 day, otherwise the dung will become covered with moulds, which are 

 injurious to the larvae. The upper layers soon dry and become hard 

 and keep the lower parts moist. In about three days the larvae become 

 mature, and then pass out of the dung and bury themselves in the sand 

 to pupate. The puparia should be collected and placed in one of the 

 large glass jars already described. 



It is sometimes possible to get the female Musca bezzii to deposit 

 a larva in a test tube if some fresh cow dung is placed at the bottom. 



Owing to the peculiar feeding habits of these species of Musca it is 

 difficult to keep them alive for long periods ; they cannot be fed in the 

 same way as the true biting Hies. Musca pattoni has, however, been 

 kept alive for a week in a glass jar (see page 343) by placing large drops 

 of blood on pieces of white paper ; the flies readily sucked it up. 



THE BITING MUSCIDAE 



The true biting Muscidae fall naturally into three subfamilies, the 

 Philaematomyinae, the Stomoxydinae and the Glossininae. The first 

 of these contains the single genus Philaematomyia, the species of 

 which closely resemble those of the genus Musca, but are distinguished 

 from them by the presence of a cutting apparatus on the labella ; the 

 proboscis is completely retractile. In the Stomoxydinae are included 

 the genera Stomoxys, Haematobia, Bdellolarynx, Haematobosca, Sty- 

 geromyia and Lypemsia, in which the proboscis is too long and pointed 

 to be concealed when it is retracted. The third subfamily contains 

 the single genus Glossina, the species of which have similar proboscides 

 to those of the Stomoxydinae. 



THE PHILAEMATOMYINAE 



GENUS PHILAEMATOMYIA, AUSTEN 



Small to large flies of a yellowish grey to dark grey colour, in general 

 appearance closely simulating the house fly. Front in male at vertex 

 narrow, from one-sixteenth to one-sixth total width of head; width of 

 front in female at centre from one-sixth to one-third total width of head. 

 Antenna three-jointed and similar to that of Musca ; arista with seven to 



