July, '09] ENTOMOLOGICAL NEWS. 309 



Most grateful acknowledgment is herewith made of the help 

 afforded in the preparation of this paper by Mr. C. H. T. 

 Townsend in the revision of plates, additions and corrections. 



Mr. C. W. Johnson and H. L. Viereck gave valuable assist- 

 ance and advice. Prof. J. S. Hine and D. W. Coquillett also 

 afforded valuable suggestions and last but not least Mr. Erich 

 Daecke has shown the deepest interest in the work and was 

 most generous in the matter, lending specimens, etc. 



A short bibliography is herewith appended : 



An Essay of Comparative Chaetotaxy, or the arrangement 

 of the characteristic bristles in Diptera, C. R. Osten Sacken, 

 Entomological Society of London, Nov. 5th, 1884. 



Manual for the Study of Insects, John Henry Comstock and 

 Anna B. Comstock, Ithaca, N. Y., 1899. 



Muscidae Collected by Dr. Donaldson Smith in Somaliland, 

 Dr. Garry DeN. Hough, Proceedings Academy of Natural 

 Sciences, 1898, pp. 165-172. 



Manual of North American Diptera, Dr. S. W. Williston, 

 New Haven, Conn. 1908. 



Explanation of Terms used in Entomology, Dr. Jno. B. 

 Smith, Brooklyn Entomological Society, Brooklyn, N. Y. 

 1906. 



The Taxonomy of the Muscoidean Flies, Including Descrip- 

 tions of New Genera and Species, C. H. T. Townsend, B. Sc., 

 Smithsonian Misc. Collections No. 1803, 1908. 



BRISTLES AND REGIONS OF THE HEAD. 



Antennae, a pair of jointed sensory organs, borne, one on 

 each side of the head. Always 3-jointed in the Myodaria and 

 bearing a dorsal arista, which may be plumose, pubescent or 

 bare. 



Antennal foveae, a pair of grooves in the middle of the face 

 as though for the lodgment of the antennae ; they may be sepa- 

 rated by a carina or keel and are bounded on the sides by the 

 facialia or vibrissal ridges. 



Arista, a specialized bristle ; borne on the upper or dorsal side 

 of the third joint of the antenna in the Myodaria. Morpho- 



