THE FLIES THAT CAUSE MYIASIS IN MAN 89 



Larva. — In the third-stage larva the posterior spiracles have a com- 

 plete peritreme, within which the button is situated, and accessory 

 oral hooks are present (fig. 6, C). 



KEY TO RESTRICTED GENERA AND SPECIES 



1. Eyes distinctly pilose; parafacials bare on lower half; about 6 latero- 



scutellars (Adichosiops) quadrimaculata (Swederus) 



Eyes bare 2 



2. Abdomen olivaceous marmorate and not metallic; anal segment and 



venter with stiff pale hair (Neopollema) 3 



Abdomen metallic green, bluish, or violet, at least in the middle 7 



3. Male with the upper eye facets much larger than the lower and with the 



eyes almost contiguous ; female front very wide, much wider than 



long 4 



Male with the upper and lower eye facets not strongly contrasting in size ; 

 female front about as wide as long 5 



4. Australian species stygia (Fabricius) 



New Zealand species laemica (White) 



5. Three pairs of presutural acrosticals, the hind pair being very near to 



the suture austratis (Boisduval) 



Two pairs of presutural acrosticals, the hind pair being remote from 

 the suture 6 



6. Eyes of male separated by the width of the ocellar triangle ; frons of 



female broader than long ( ratio, 26 : 20) ; frontal orbits with a strongly 



silvery sheen . rufipes (Macquart) 



Eyes of male separated by twice the width of an ocellus ; frons of female 

 as long as broad ; frontal orbits with a golden sheen fallax (Hardy) 



7. Abdomen yellow on the base, sides, and venter, less so on anal segment ; 



epistoma strongly warped; legs mainly yellow (AnasteUorhina) 8 



Abdomen green, bluish, or violet, without yellow areas ; epistoma not so 

 strongly warped ; legs wholly black ; arista plumose practically to the 

 tip ; 3 sternopleurals ; frontals stopping practically at the bases of 

 the antennae ; scutellum with 4 or more strong lateral bristles. 

 (Calliphora) 9 



8. Abdominal stripe blue-green, with yellow pollen on the fourth ter- 



gite augur (Fabricius) 



Abdominal stripe vivid blue, with white pollen on the fourth ter- 

 gite nociva (Hardy) 



9. Bucca reddish on anterior half or more; basicosta often yellow to 



yellow-orange vicina Robineau-Desvoidy 



Bucca entirely black, the facial grooves, however, yellow to orange 10 



10. All hairs of bucca black ; basicosta silvery croceipalpis Jaennicke 



The longer hairs on the posterior part of the bucca orange; basicosta 

 black vom itoria ( Linnaeus) 



ADICHOSIOPS QUADRIMACULATA (Swederus) 



Synonym. — Calliphora quadrimaculata (Swederus) . 



Geographical Distribution. — Australian Region : New Zealand, Auckland 

 Islands, Campbell Island. 



Pathogenesis. — This is a sheep maggot of minor importance in New 

 Zealand. It is extremely common in human dwel lings. 



NEOPOLLENIA STYGIA (Fabricius) 



The Largo Brown Blowfly ; the Golden-haired Blowfly 



Synonym. — Calliphora stygia (Fabricius). 



Geographical Distribution. — Australian Region: Western Australia, South 



Australia, Queensland, New South Wales, Canberra, Victoria, Tasmania. 



Pathogenesis. — This is one of the more important sheep maggots in 

 Australia and is a primary parasite. 



