23-4 Patton: The Genus Musca Linn&us 32I 



5. Thorax dark gray, inner thoracic stripes very narrow before the suture. 



Abdomen dark orange; apparent first segment dark; apparent third 



and fourth segments blackish _ m. craggi Patton. 



Thorax greenish gray, inner stripes not markedly narrow in front of 

 the suture. Abdomen bright orange; apparent first segment darker 

 anteriorly; apparent second with a narrow median stripe. 



M. planiceps Wiedemann. 



6. Thorax gray with two broad black stripes. Abdomen orange; apparent 



first segment either dark or light brown; apparent third and fourth 

 segments with a median black stripe and admedian and marginal 



silvery spots. Eyes well separated M. sorbens Wiedemann. 



Thorax bluish gray with two broad black stripes. Abdomen dark 

 orange; apparent first segment black; other two segments similar to 

 those of sorbens. Eyes almost meeting in the middle line. 



M. vetustissima Walker. 



7. Large species with dark gray thorax and well-marked broad black 



stripes. Abdomen brown with silvery and black stripes. Squama; 



with long black hairs on middle and posterior part of upper surface. 



Eyes widely separated M. inferior Stein. 



Large species; thorax gray with four broad black stripes. Abdomen 



dark orange with dark stripes and silvery spots. Squama bare on 



upper surface. Eyes meeting in middle line M. bakeri sp. nov. 



Key to the females of the known Philippine species of the genus Musca. 



1. Small or medium-sized species with four thoracic stripes _ 2. 



Medium-sized species with only two thoracic stripes 6. 



Large species with four thoracic stripes 7. 



2. Small species. Thorax light gray with four compara!ively narrow 



black stripes, well separated. Abdomen dark gray with bands and 

 stripes; apparent first segment black; apparent second segment with 



a basal black band of varying width M. conducens Patton. 



Medium-sized species. Thorax grayish or blackish_ 3. 



3. Thorax dark gray with four broad black stripes _ 4. 



Thorax lighter gray with four narrower black stripes 5. 



4. Abdomen dark brown; apparent first segment black or dark brown 



anteriorly _ M. vic i na Macquart. 



Abdomen light orange; apparent first segment also light orange; silvery 

 stripes and spots on remaining segments well marked. 



5. Inner thoracic stripes in front of suture narrowing toward the 1 



domen bright orange; apparent first segment black; apparent second 



segment with a broad median black stripe and a broad black basal band. 



M. craggi Patton. 



Inner thoracic stripes not markedly narrower, if at all, than the outer. 



Abdomen light orange with well-marked yellow pollinosity. 



Inner thoracic stripes a little narrower than the outer. Abdomen olive 

 green; apparent first segment black anteriorly; apparent second 

 segment with an anterior narrow black band and a narrow median 

 black stripe m. crassirostris Stein. 



