PORPHYROPS. 143 



little narrower ; the last segment of the fourth longitudinal vein 

 moderately inflected. Hypopygium small, rounded, rather im- 

 bedded, its outer appendages almost in all the species more fili- 

 form than lamelliform ; the outer appendages small. 



With regard to the mutual relation of the three kindred genera, 

 namely, Ehaphium, Xiphandrium and Porphyrops, all the re- 

 quired information has already been furnished, so that a repetition 

 of their distinctions is not necessary. I have vindicated the name 

 of Porphyrops for this genus in the fifth volume of the Neue 

 Beitriige. An entirely unfounded opposition had been raised 

 against it. The following are the reasons by which I have been 

 governed with relation to the name Porphyrops. Meigen, in 

 the fourth volume of his works, has taken a wider view of the 

 genus Porphyrops and divided it into three sections : 1. With a 

 subapical arista. 2. With an apical arista ; and, 3. With an 

 arista inserted dorsally on the third joint, near the basis. In his 

 seventh volume he adopts the genus Argyra, which M. Macquart 

 had in the meantime established for the first of the three divisions ; 

 the third division he unites with Medeterus ; and for the only 

 remaining second division, which principally contains species of 

 the present genus, he retains the name of Porphyrops ; at the 

 same time he unites with them the species of his genus Ehaphium 

 (that is the genera Ehapliium and Xiphandrium in the sense 

 adopted above). As I cannot agree with this reunion, I am com- 

 pelled to retain the name of Porphyrops for the genus, which 

 embraces most of the species contained in Meigen's second division 

 and this is the present genus. 



The name Porphyrops (from mop^vpa, scarlet, and <Z$, face) has 

 reference to the beautiful scarlet color which is peculiar to the eyes 

 of many species, especially the males. 



The hitherto known species of Porphyrops are distributed all 

 over Asia Minor, Europe, and North America. 



Table for the determination of the Species. 



( Feet black. 1 melampus Lw. 



1 1 Feet yellow. 2 



f All the cox?e black. 2 nigricoxa Lw. 



( Fore coxaa yellow. 3 



( Fore coxae not blackened at the basis. 3 fumipennis Lie. 



I Fore coxae blackened at the basis. 4 rotundiceps Lie. 



