SPECIES OF THE GENUS MUSCA, LINNAEUS. 417 



it a name, and it will be necessary to conijmre the external genitalia of both sexes 

 with those of domesiica, L., as well as with those of s])eciniens from other tropical 

 countries. I believe the following will prove to be this atypical form of domesiica : — 



1. Musca sanctac-helenae , Macquart, Saint Helena. 



2. Mftsca lateralis, Macquart, Mauritius. 



3. Musca basilaris, Macquart, Brazil, Mexico. 



4. Musca frontalis, Macquart, Algeria. 



5. Musca analis, Macquart, Chili. 



6. Musca consangninea, Rondani, America, Mexico. 



7. Musca senegalensis, Macquart, Senegal. 



8. Musca Jiavinervis, Thomson, Ross's Island. 



9. Musca antiquissima, Walker, Australia. 



10. Musca calleva. Walker, South Africa. 



11. Musca vicaria, Walker, New Zealand. 



I have examined Bigot's types of Musca pampasiana (Buenos Ayres), Musca 

 flavifacies (New Caledonia), and Musca atrifrons (Cuba), and consider that they are 

 all specimens of this form. There seems very little hope of getting any further 

 light on Macquart 's species, as Mr. Collin tells me that his types are in bad preservation. 



When examining these atypical forms of domestica in the National Collection, 

 Major Austen drew my attention to its occurrence in Greece in company with the 

 typical domestica, but exactly where this species first makes its appearance in the 

 Palaearctic Region, I am not at present able to say. I hope those who have oppor- 

 tunities of examining and collecting specimens of Musca from Europe will be on the 

 look-out for this narrow-fronted male domesiica, and send me specimens. 



I have no doubt that Hough's Musca hiseta is this species ; it is common in Aden 

 and most probably in Somaliland. 



3. Musca hum ill's, Wiedemann. 



Synonyms : Musca primitiva. Walker. 



Musca conducens, Walker. 



Musca praecox. Walker. 



Musca angustifrons, Thomson. 



Musca bivittata, Thomson. 



Musca niveisquaina, Thomson. 



Musca eutaeniata, Bigot. 



Musca promisca, Awati.. 

 This strikingly marked species is the most important tropical house, bazaar 

 and camp fly. It is of peculiar interest, as in its habits it links the house-fly with 

 the wild haematophagous species. Its larvae may be found in a great variety of 

 food-stuffs, in isolated patches of cow-dung, horse-dung and human excrement ; 

 also in cow-dung and horse-dung when piled in heaps, in night-soil trenches, and in 

 decaying vegetable matter. I have also bred it in dog's dung and in the decomposing 

 bodies of rabbits. As it commonly breeds in patches of cow-dung when dropped 

 in the field, the adults are frequently found on cattle and horses far from human 

 dwellings. Under these conditions they feed on the discharge coming from sores, 

 and from the eyes and noses of cattle. As often as not, the specimens which hatch 

 out of larvae in isolated patches of cow-dung are very small, and they are most 

 irritating pests in the fields, swarming about one's head, as do the adults of Hydrotaea 

 irritans in the summer months in Europe. 



In India it swarms in the bazaars, where it may be seen on food-stufls of all kinds, 

 as well as on human beings, particularly around the eyes of children. In Mesopo- 

 tamia it was quite common to see the eyes of small chiklren covered with the females 

 of this species, and this explains how the eyes of adults become infected with various 

 pathogenic bacteria. 



