THE FLIES THAT CAUSE MYIASIS IN MAN 47 



4. Rows of frontal bristles parallel, not diverging below (cf. striata, fig. 17) ; 

 both epaulet and basicostal scale yellow 



Vherm in ieri ( Kobineau-Desvoidy ) 



Figure 18. — Sarcophaga haemorrhoidalis, head of female, front view. 



5. Male hypopygium of medium size ; the posterior forceps tapering and 



slender apically placida Aldrich 



Male hypopygium small; the posterior forceps broad throughout and 

 truncated apically . lambens Wiedemann 



6. Prescutellar acrosticals absent or at most rudimentary 



haemorrhoidalis (Fallen) 

 Prescutellar acrosticals well developed 7 



7. Middle tibiae with long villous hairs ; larger species, usually 14 mm. or 



more in length, with considerable light golden pollen on the head and 



anterior parts of the thorax chrysostoma Wiedemann 



Middle tibiae without long villous hairs; species of medium size (usually 

 10-12 mm.) with gray or at most slightly yellow pollen. A very difficult 

 complex of species runs to this point ,and the distinctions made below 

 must be considered rather unsatisfactory 8 



8. First genital segment black or blackish, at least on the apical half 9 



First genital segment yellow or red, at least on apical half 11 



9. Both genital segments entirely black harpats Pandelle 



tuberosa Pandelle 

 Genital segments in part prominently yellow or red 10 



10. Occiput with but a single row of black setulae behind the eyes 



crassipaplis Ma (-quart 



Occiput with more than one row of black setulae barbata Thomson 



exuberans Pandelle 



11. Third abdominal segment with median marginal bristles bullata Parker 



Third abdominal segment without median marginal bristles 



oooleyi Parker 



KEY TO OLD WORLD SPECIES (BASED LARGELY OX MALES) 



1. Three well-developed and evenly spaced postsutural dorsocentrals (cf. 



Titanogrypha alata, fig. 12, B) 2 



Four or more postsutural dorsocentrals, or at least the series distinctly 

 spaced for four or more (fig. 12, A) 3 



2. Frontal bristles extending to the base of the antennae and not diverging 



below, except as they follow the margins of the frontalia (fig. 17) 



striata (Fabricius) 

 Frontals extending below bases of the antennae and one or more bristles 

 below the anterior points of the frontalia, and diverging below (cf. 

 fig. 18) fertoni Villeneuve 



3. Hind tibiae fringed with long villous hairs (fig. 16) (5 



Hind tibiae with only ordinary short hairs 4 



