December, '13] BRUES: STOMOXYS DISTRIBUTION 461 



to maintain its existence for long periods on shipboard, and is un- 

 doubtedly thus carried for long distances. From the following data 

 recently given me in a letter by Dr. H. H. P. Severin, it will be seen 

 that at the present time the species is readily transported by ships, 

 and conditions in the past must have been still more favorable for 

 its existence under such circumstances. Dr. Severin Avrites: ''In 

 making the trip from San Francisco to Honolulu, the boat on which 

 I was traveling carried about fifteen mules and horses which were 

 placed in temporary stalls on the lower deck of the steamer. These 

 stalls were crudely constructed, consisting of but little more than 

 the roof, and yet during the seven days' of the trip, I noticed stable 

 flies pestering these animals." ^ Such adaptability on the part of 

 Stomoxys calcitrans undoubtedly accounts for the ease with which it 

 has become disseminated so widely, and it seems strange that other 

 members of the same genus have not followed it generally in its 

 migrations. 



Together with a number of related genera, all of old-world origin, 

 Stomoxys is usually regarded as forming the subfamily Stomoxydince 

 of the family Muscidse. All of these genera are sharply differentiated 

 from other Muscidse by the piercing mouthparts and phlebotomic 

 habits of the imago. At the present time, some seven genera have 

 been recognized. 



1. Glossina Wiedemann. 



2. Lyperosia Rondani. 



3. Hoematobosca Bezzi. 



4. Hmnatobia Robineau-Desvoidy-*Sip/!ono Meigen?). 



5. Stygermnyia Austen. 



6. Stomoxys Geoffroy. 



7. PhilcEmatomyia Austen. 



8. Glossinella Griinberg. 



Of Stomoxys a large number of species have been described, some 

 thirty-one of which appear to be well founded. Thirteen of these 

 were listed by Bezzi ^ in 1907, and the remainder have since been 

 distinguished. 



1. hengalensis Picard. Bull. Soc. Ent. France. 20: p. 21 (1908). India. 



2. bilineata Grunberg. Zool. Anz. 30: p. 89 (1906). East Africa. 



3. boneti Roubaud. Bull. Soc. Path. Exot. 4: p. 124 (1911). Dahomey. 



4. bouffardi Picard. Bull. Soc. Ent. France, 1907, p. 27. Sudan. 



1 Since Dr. Severin's communication was received, the writer has had the oppor- 

 tunity to observe the same conditions on steamers that carry horses and cattle, 

 plying on the western coast of South America between ports in Panama, Ecuador 

 and Peru. 



2 Mosche Ematofaghe. Rendi. R. 1st. Lomb. Sci. and Lett., II: 40 (1907). 



