THE FLIES THAT CAUSE MYIASIS IX MAX 



41 



Thar, in ^ome cases, the median spots may not reach the bases of the segments. 

 Larva : No descripiton has been published ; the larva is presumably as in W. 

 vigil. 

 Geographical Distribution. — Xearctic Region: Alberta. British Columbia, 



South Dakota. Montana, Idaho, Wyoming, Colorado, Utah, New Mexico, Arizona, 

 Washington. Oregon. California. 



Biology and Pathogenesis. — The clinical data are the same as those 

 for W. vigil. Some cases of human myiasis are on record, and the 

 young of dogs, foxes, and mink have been attacked. 



Xo satisfactory distinctions in external characters have been made 

 between this species and the European W. meigeni (Schiner ) . although 

 biologically they are quite different, the European species being 

 strictly saprophytic. 



WOHLFAHRTIA NUBA (Wiedemann) 



Geographical Distribution. — Palaearctic Region : Libia. Egypt, southern 

 Arabia. Uzbek (Bukhara). Ethiopian Region: Senegal (Dakar), Anglo-Egyptian 

 Sudan (Khartoum), Ethiopia. Socotra. 



Pathogenesis. — This species frequently infests wounds of animals, 

 particularly camels, and of nomads belonging to tribes associated 

 with camels in northern Africa. Indications are. however, that it 

 feeds on diseased tissue only. A small number of larvae were reported 

 by Roubaud {126) to have been taken from a dog in a case that ended 

 fatally, but the maggots were probably not the cause of death. This 

 species has been used in maggot wound therapy. 



The Genus TITANOGRYPHA Townsend 



The species of this genus resemble a small Sarcophagy but may 

 easily be distinguished by the presence of a mat of short, dense hairs 

 on each side of the scutellum below the level of the lateral bristles 

 (fig. 12, B). The antennal arista is short-plumose about halfway to 

 the tip (fig. 8, G) ; vein r x is setulose about halfway to the apex, and 



Figure 12. — Outline drawing of thorax: A, Sarcophaga bullata; B, Titanogrypha 

 ulata, to show mesonotal chaetotaxy. 



