23,4 Patton: New Oriental Species of the Genus Musca 325 



well with this species I have before me, especially in the charac- 

 ter of the short, wide abdomen, particularly of the female. 



Musca illingworthi belongs to my Group II of the Genus Musca 

 and, excluding the strictly Indian species, I know only two other 

 Oriental species with which it may be confused ; namely, Musca 

 bakeri Patton, 8 from the Philippines, and Musca hervei Ville- 

 neuve, from southern China. It can be distinguished from the 

 former by noting the following characters: In the male of 

 bakeri the apparent first abdominal segment is either entirely 

 black or there is a narrow posterior brown band ; in illingworthi 

 the segment is never — at least in the two specimens — entirely 

 black, and the median posterior dark patch is more extensive, 

 forming a band. The second segment in bakeri is lighter brown, 

 the marginal silvery spot much smaller and the admedian 

 area not nearly so dark; in illingworthi the segment is darker 

 and the admedian brown stripe is pronounced and very dark. 

 These differences are noticeable in the two other segments. 

 The sternites of bakeri are black or dark brown, while in illing- 

 worthi they are light brown. The females are easily distin- 

 guished. The female of bakeri is a grayish fly, the abdomen 

 in particular having a grayish white checkered appearance; the 

 female illingworthi, on the other hand, is similar to the male, 

 and the abdomen is dark brown. 



In the British Museum collection I found several males of 

 Musca bakeri from Singapore, and a male and two females from 

 Kajoe Taman, Sumatra, showing that this species may quite 

 well be found in the same localities as Musca illingworthi. I 

 hope later to have an opportunity of examining the species 

 referred to by Stein; these specimens are, I understand, now 

 in Amsterdam. 



Musca illingworthi can be distinguished at once from Musca 

 hervei by noting that in the latter the small bristles on the 

 ventral side of vein R 4+5 are strictly limited to the basal por- 

 tion of the vein and do not reach or extend beyond the radio- 

 medial cross vein. Further, the sternites and the ventral edges 

 of the tergites in hervei are black, giving the appearance of a 

 dark line inclosed in brackets. 



In addition to Musca illingworthi, the collection contains a 

 long series of both sexes of Musca inferior Stein, a very charac- 

 teristic bloodsucking species belonging to my Group III; both 

 sexes have long dark hairs on the upper surfaces of the squamae. 



