590 



THE ANIMAL PARASITES OF MAN 



records several cases of myiasis due to Sarcophaga (vide Trans. Soc. Trop. Med. 

 and Hyg., 1910, iii, No. 6). 



The larvae of African Muscidce have now become of greater 

 interest; like several Oestrid larvae they live normally in the skin of 

 mammals, but also attack man. The knowledge of these species is 

 certainly very insufficient, but this is not likely to be the case much 

 longer, as medical men practising in the Colonies are giving their 

 attention to these parasites. At the present time four distinct forms 

 are recognized according to Gedoelst. 1 



Sarcophaga chrysotoma, Wied. 



[This species is recorded as attacking human beings at New Amsterdam, British 

 Guiana. The fly is 15 mm. long, has a golden-coloured face, three broad black 

 thoracic stripes and ochraceous buff anal segments. It was bred from larvae 

 obtained by Dr. Roland from a sore on a girl's foot. It is known to occur in the 

 Brazils and the West Indies. Another species was also bred which Austen was 

 unable to identify. F. V. T.] 



Sarcophaga plinthopyga, Wied. 



[This and other species of Sarcophaga are called "yaw flies" in Dominica, as 

 they are believed to be concerned in the dissemination of framboesia or yaws 

 (Nicholls) (vide Austen, Trans. Soc. Trop. Med. and Hyg-, 

 1910, iii, p. 239). F. V. T.] 



Ochromyia anthropophaga, E. Blanch. ; 

 Cordylobia arthrophaga, Griinberg. 



Indigenous to the Senegal and neighbouring districts ; 

 in the district of Cayor (between the mouth of the Senegal 

 and Cape Verde) the larva is known as the " ver de Cayor.''' 

 It lives under the skin, especially at the lower extremities 

 and the lower region of the trunk, producing small boils, 

 which cause pain, but after about eight days, when the 

 larva leaves the body to enter the pupal stage, the pain 

 discontinues. Besides man the larva occurs in dogs, goats, 

 cats, and in the jackal. It is still questionable whether 

 the fly deposits its eggs direct or on the ground, from 

 whence the larvae as they emerge gain access to animals 

 and man. Larvae yellowish-white, 14 mm. long, 4 mm. wide, 

 eleven segments 2 ; head with two globular antennae-like 

 appendages, two black curved month hooks, and two wart- 

 shaped, finely spinous structures at their base. Body evenly 

 covered to the seventh segment with small black prickles, 



which are stronger at the sides and the anterior borders of the segments ; from the 

 seventh they increase in size, on the two hindermost they are wanting; on the last 

 segment two deep yellow spiracles, each with three markedly curved fissures ; in 



1 [The following are known to cause myiasis in man in Africa : Cordylobia anthropophaga, 

 Griinb. ; Auchmeromyia luteola, Fabr. ;" A. rodhani. Gedoelst ; Oestrus ovis, Linn. ; and 

 Anthoniyia desjardensii, Macq. The anthropophaga, Blanchard, and the depressa, Walker, 

 referred to here are Griinberg's anthropophaga. F. V. T.] 



2 [Austen gives the length as 12 to 12-5 mm. and the breadth as 5 mm. ; he describes the 

 larva as follows : Bluntly pointed at the anterior extremity, and truncate behind ; from third 



FlG. 409. Ochromyia 

 larva on the skin of 

 man, South Africa. 

 3/1. (After Blanchard.) 



