THE FLIES THAT CAUSE MYIASIS IN MAX 



139 



including keys to the Palaearctic, Ethiopian, and Oriental species. 

 For a further treatment of the Ethiopian species, including a key, see 

 Van Emden (164, PP- 73-8A) \ for a key to the Australian species, see 

 Hardy (S3). 



KEY TO SPECIES 



ADULTS 



1. Mesonotum with 2 black vittae, which, in the females, are divided in the 



form of a Y in front of the suture sorbens Wiedemann 12 



Mesonotum with 4 complete black vittae 2 



2. Propleura distinctly pilose, although sometimes with but a few hairs; 



proboscis <>f the ordinary form, without a bulbous haustellum or 



prestomal teeth; palpi black 3 



Propleura bare: proboscis thjckened. with a bulbous haustellum and 

 prestomal teeth (fig. SI i : palpi yellow crassirostris Stein 



3. Front of male at narrowest point about 3 times as wide as the third 



antennal segment; abdomen largely infuscated in the female and with 

 at least the third and fourth segments infuscated in the male. 



domestica Linnaeus 

 Front of male at narrowest point less than 3 times as wide as the third 

 antennal segment: abdomen more or less bright orange, especially 

 basally. and darkened on the fourth segment and at least the apex 

 of the third in the male vicina Macquart 



THIRD-STAGE LARVAE 



1. Posterior spiracles heavily sclerotized and without a peritreme (fig. 



80, C) crassirostris Stein 



Posterior spiracles with a distinct peritreme__ 2 



2. Peritreme thick (fig. 80. B) sorbins Wiedemann 



Peritreme thin (fig. 80, A) domestica Linnaeus 



vicina Macquart 



MUSCA CRASSIROSTRIS Stein 



Synonyms. — Philaematomyia crassirostris (Stein) ; Musca insignis Austen. 



Recognition Characters. — Adult: This species is readily recognized by The 

 light gray color, the olive or grayish-green abdomen, 

 the yellow palpi, and the thickened bulblike haustel- 

 lum (fig. 81). Thorax has four narrow vittae. the 

 outer ones being interrupted at the suture. Length 

 about 5-7 mm. Larva : The mature larva is of a 

 characteristic lemon-yellow color: the anterior spir- 

 acles possess seven or eight fingerlike processes; the 

 posterior spiracles are densely sclerotized, without a 

 peritreme (fig. 80. C). 



Geographical Distribution. — Palaearctic Region : 

 China (Shantung), Libia. Egypt. Anglo-Egyptian Su- 

 dan (Khartoum), Dodecanese. Cyprus, Palestine, 

 Arabia, Iraq, Iran. Ethiopian Region: Senegal. Gold 

 ('oast. Socotra, Belgian Congo. Rhodesia. South 

 Africa (Transvaal). Oriental Region: India. Ceylon. 

 Burma. Malaya. Taiwan, Philippine Islands, Su- 

 matra. Borneo. Java. 



Figure 81. — M u s c a 

 crassirostris, head of 

 female, side view. 

 (After Patton (105).) 



Biology and Pathogenesis. — This species 

 is oviparous: the eggs are deposited in masses 

 in fresh cow or horse manure in the field. 

 Development is rapid. The adult sucks blood ; 



its proboscis is provided with a strong bulbous haustellum and with 



rasping prestomal teeth on the Labella. 



n Musca sorbens Wiedemann is the common housefly of extensive areas in the 

 warmer parts of the Old World. It is not known to he involved in human myiasis. 



