THE FLIES THAT CAUSE MYIASIS IN MAN 67 



of these groups can be clarified. The name Pycnosoma has been used 

 by some authors, but it is an absolute synonym of Chrysomija. 



The following characters are common to the members of this com- 

 posite : The flies are of rather small {Microcalliphora) to medium 

 size and brilliant metallic green to blue or purple, usually, however, 

 with at least the narrow apices of the abdominal segments opaque 

 black; the eyes are broadly separated in the female, narrowly so or 

 contiguous in the male (except in Microcalllphora) ; the epistoma 

 projects downward and forward: the palpi are well developed and 

 somewhat thickened apically. The mesonotal bristles are weak, the 

 dorsocentrals and acrosticals, except those near the scutellum, being 

 much weaker than the bristles toward the sides of the mesonotum. 

 The posterior coxae are bare behind; the lower squamae are bare 

 above. 



In spite of a considerable amount of literature, no thoroughgoing 

 revision of the species of the world has been made. Bezzi's (17, p. 185) 

 key includes a large number of Oriental and Australian species. 



KEY TO SPECIES 



ADULTS 



1. Vibrissae set very close to the oral margin ; small species, usually under 



5 mm. in length ; body bluish green, the legs yellowish, banded with 



black MicrocalUphora varipes (Macquart) 



Vibrisaae well above the oral margin ; larger species, usually 8 mm. or 

 more in length 2 



2. Anterior margin and base of wings deeply infuscated 



marginalis ( Wiedemann ) 

 Wings entirely hyaline 3 



3. Mesothoracic spiracle white 4 



Mesothoracic spiracle brown 7 



4. Stigmatic bristle present 3 



Stigmatic bristle absent albiceps (Wiedemann) 



5. Mesonotum in front of the suture with a prominent, dull -black L-shaped 



marking on the left side and the reverse of it on the right 



chloropyga (Wiedemann) 

 Mesonotum in front of the suture wholly green or with narrow length- 

 wise coppery vittae 6 



6. Parafacials and facials extensively reddish ; parafrontals of male with 



numerous pale hairs, in several rows, in addition to the very weak 



bristles ruftfades (Macquart) 



Parafacials at least in large part black ; parafrontals of male with but few 

 scattered hairs in addition to the distinctly developed bristles 



putoria ( Wiedemann) 



7. Squamae yellowish to dirty gray : front and frontalia of female bulging in 



the middle, not parallel-sided (fig. 29) 8 



Squamae waxy white; front and frontalia of female parallel-sided (fig. 

 28) ; eyes of male without a definite area of smaller facets (fig. 30). 



bczziamt Villeneuve 



8. Eyes of male with a definite area of smaller facets below (tig. 31) ; 



frontalia of female dark brown to black, the parafrontals and parafacials 



dark grayish megacephala (Fabricius) 



Eyes of male without a definite area of smaller facets below; frontalia of 

 female reddish brown, the parafrontals and parafacials yellowish gray 



micropogon (Bigot) 



THIRD-STAGE I>ARVAE 7 



1. Larvae hairy, that is, with a transverse row of fleshy tubercles medially 



on each segment (fig. 32, A) 2 



Larvae smooth, without such tubercles 4 



Key compiled from the literature. 



