320 The Philippine Journal of Science 1923 



Panay {McGregor) . The specimens agree in every detail with 

 those from other parts of the Oriental and Ethiopian Regions. 

 I have no doubt that this is Stein's species crassirostris, but I 

 hope soon to have the opportunity of examining the type and 

 settling this point. With Professor Bezzi, I came to the con- 

 clusion that Musca modesta de Meijere from Java is also this 

 species, and Professor de Meijere tells me that this is the case, 

 and that Stein had also come to the same conclusion. I have 

 examined the type of insignis and there is no doubt that it is 

 identical with crassirostris. 



Musca crassirostris can be easily recognized by its dark gray 

 or olive-green to blackish coloration; by its narrow thoracic 

 stripes; and by the characteristic abdominal markings. The 

 apparent first abdominal segment is dark anteriorly, the lower 

 border often edged with a narrow black band; the apparent 

 second segment is edged anteriorly with a narrow black band 

 and a complete or incomplete median stripe ; the apparent third 

 segment usually has a small anterior median spot or stripe. An 

 examination of the proboscis will always confirm the determina- 

 tion; the large shining bulb, or mentum, is very characteristic, 

 and when the teeth are everted they can be easily seen. 



The following key to the species noted above may be useful 

 to those who wish to identify their specimens: 



Key to the mules 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 greenish gray with four moderately broad, black 



thoracic stripes tending to unite behind the suture. Adbomen orange 

 with well-marked gray pollinosity; apparent first segment dark brown 



or nearly so _ M> conducens Patton . 



Medium-sized species. Thorax grayish or blackish . 3. 



3. Thorax grayish with four either broad or narrow black stripes. Eves 



well separated _ 4 _ 



Thorax grayish or greenish, with I Eyes almoal 



meeting in the middle line _ 5 



Thorax blackish with four broad black een. Abdomen 



a .,°, rangewithoutan y markings M. ventrosa Wiedemann. 



4. Abdomen light orange; apparent first segment narrowly black anteriorly; 



apparent third segment mainly orange M. nebulo Fabricius. 



Abdomen darker orange; apparent first segment with broader black 



band; apparent third segment mainly black M. vicina Macquart. 



Abdomen olive green; apparent first segment black anteriorly, remainder 



grayish green ; apparent second segment grayish green with a median 



narrow black stripe; apparent third segment with an anterior median 



black spot 



