20 HOUGH. [Vol.. I. 



Squamula thoracalis not broadened mesad and caudad. Wings 

 not rilled. 1 



b. Muscinae ariciaeformes. - - Front narrow in the male, 

 broad in the female. Squamula thoracalis not broadened 

 mesad and caudad. Wings in the most recent forms (geologi- 

 cally speaking, the "youngest") rilled. 



c. Muscinae muscaeformes. Front as in b. Squamula 

 thoracalis broadened out mesad and caudad as far as the edge 

 of the scutellum. Wings rilled. Apical cross-vein present. 



Girschner's family AntJiomyidae includes, in the first two 

 groups, the AntJiomyidac and part of the Muscidae (sens, 

 strict.) of other authors. The genera belonging to the former 

 have been made the subject of a recent paper by Mr. Paul 

 Stein in the Bcrl. Ent. Zdt., Vol. XLII, pp. 151-288, 1897. 

 This paper covers the Cocnosiinac ; 2 the Muscinae cocnosiac- 

 fonncs ; and the Muscinae ariciaeformes, except the genera 

 Myospila, Muscina, Clinopera, HcmicJilora, Stomoxys, and 

 Hacinatobia. In these genera the fourth longitudinal vein is 

 bent up, near its apical end, towards the third, and the arista 

 is either pectinate or long plumose. They may be separated 

 from one another as follows : 



1 . Proboscis long, slender, horny, adapted for piercing ... 2 

 Proboscis not so constructed, provided at the tip with fleshy labellae 3 



2. Palpi much shorter than the proboscis, arista pectinate Stomoxys Geoffroy 

 Palpi nearly as long as the proboscis, arista pectinate, sometimes also 



. with a few hairs below .... Haematobia Desvoidy 



3. Arista pectinate ... . . Hemichlora v. d. Wulp 

 Arista plumose .......... 4 



4. Sternopleural macrochaetae 2:2; eyes hairy . Myospila Konclan 

 Sternopleural macrochaetae 1:2; eyes not hairy .... 5 



5. First longitudinal vein ends far beyond the middle of the costa. One 



or more well-developed pairs of anterior acrostichal bristles 



Muscina Desvoidy 



First longitudinal vein ends before the middle of the costa. No anterior 

 acrostichal macrochaetae . . . Clinopera v. d. Wulp 



1 These rills are very fine grooves in the surface of the wing which run in a 

 sort of radiate manner toward the border. They are very numerous. A rilled wing 

 denotes a higher stage of development, a more recent form, than an unrilled wing. 



2 Girschner's Coenosiinae includes a few genera which are commonly consid- 

 ered as members of the Acalyptrate family Scatomyzidae ; these genera are not 

 considered by Mr. Stein. 



