NOTES ON THE MYIASIS-PRODUCING DIPTERA. 245 



Gasterophilns veterimis, Clark [nasalis, L.).- — Tliis species is found throughout 

 Europe, North America, Austraha, French (iuinea and Mesopotamia. Its eggs are 

 always attached to the hairs between the rami of the lower jaw, the fly darting 

 between the legs and striking the space, each time depositing an egg. Townsend 

 states that the eggs actually pierce the skin, but it is only necessary to examine the 

 ovipositor to see that this is an impossibility. 



Gasterophilns pecornm, F. — This is the common horse bot of Russia, Hungary 

 and Italy ; it has also been recorded from South and West x\frica. A variety, zebrae, 

 Rodh. & Beq., is parasitic in its larval stage in the stomach of the zebra, Eqims bohnii, 

 in East Africa. 



The following species are only known in their adult stages : — 



Gasterophilns flavipes, Oliv. — This species is recorded from the Mediterranean 

 region, Spain, North Africa, Asia Minor and the Anglo-Egyptian Sudan. Its larvae 

 are believed to be parasitic in the stomach of the ass. 



Gasterophilns nigricollis, Lw. — This species is only known from Bessarabia. 



Gasterophilus lativentris, Brauer. — From Courland. 



Gasterophilns magnicornis, Bezzi. — This species is found in the Italian Somaliland 

 and is probably identical with G. intestinalis var. bengalensis, judging from the des- 

 cription. Its larvae are believed to be parasitic in the stomach of the horse and ass. 



The following species are only known as larvae : — 



Gasterophilus gedoelsti. Rodh. & Beq. —From East Africa ; the larvae are parasitic 

 in the stomach of the zebra, E. bohmi. 



Gasterophilus ternicinctus, Ged. — From Nyasaland ; the larvae are parasitic in 

 the stomach of the zebra, E. bnrchelli craxishayi. 



There are several other doubtful larvae of Gasterophilus that have been described. 

 There can, I think, be very little doubt that when a critical examination is made of 

 fresh material of the larvae and adults of the species of this subfamily, this long list 

 of species will be reduced. 



Rodhain and Bequaert place in this subfamily the bot-flies of the rhinoceros, 

 Gyrostigma, of which there are three, possibly four, good species, the adults of only 

 two being known. 



Gyrostigma pavesii, Corti.^ — This species, the adults of which are known, is parasitic 

 in its larval stage in the stomach of the African black rhinoceros, R. bicornis, which 

 is found from Abyssinia and Somaliland, through East and Central Africa, in suitable 

 localities down to the Cape. It is also found in the stomach of the white or Burchell's 

 rhinoceros, R. simus cottoni, which is found in South and South-East Africa, as far 

 north as the Zambesi, and again in equatorial Africa at Lado, just north of the 

 Equator. 



Gyrostigma meruenis, Sjostedt. — The larvae of this species are parasitic in the 

 stomach of the black rhinoceros, R. bicornis. 



Gyrostigma conjugens, Enderlein. — The larvae of this species are also parasitic 

 in the stomach of the same rhinoceros. 



Gyrostigma snmatrensis, Brauer.— The larvae of this species were recovered 

 from the stomach of the Sumatran rhinoceros, R. snmatrensis, which is found in 

 Assam and Siam, the Malay Peninsula, Smnatra and Borneo, and also from the 

 stomach of the Assam local race, R. snmatrensis lasiotis. 



According to Rodhain and Bequaert the eggs of G. pavesii are laid on the skin 

 of the ears, neck and shoulders of the host, so that it is very probable that the larvae 

 are only able to leave the eggs when, as in the case of Gasterophilns intestinalis, they 

 are licked ; on reaching the mouth they can then pass down into the stomach. 



