98 INSECUTOR INSCITI^ MENSTRUUS 



gioii and the subtropical zone. Specimens before me show 

 the following actual records : 



"Mexico," 1 male ; Cacao, Trece Aguas, Alta Vera Paz, 

 Guatemala, 1 female, April 19 (Schwarz and Barber) ; Car- 

 illo, Costa Rica, 1 female (Schild and Burgdorf) ; Rio Trini- 

 dad, Panama, May 7, 1911, 1 female, June 4, 1913, 1 male (A. 

 Busck) ; Island of Trinidad, 1 female (F. W. Urich). 



Tabanus flavus Macquart. 



Tabanus flavus Macquart, 1834, Hist. Nat. Ins., Dipt., vol. 1, p. 



200. 

 Tabanus mexicaniis Osten Sacken (in part, not Linn.), 1876, 



Prodrome Taban. U. S., part 2, p. 459. 

 Tabanus mexicaiius Aldrich (in part, not Linn.), 1905, Cat. No. 



Amer. Dipt., p. 205. 

 Tabanus mexicanus Hine (not Linn.), 1907, 2d Rept. Horseflies 



La., p. 52. 

 Tabanus mexicanus Kertesz (in part, not Linn.), 1908, Cat. Dipt., 



vol. 3, p. 260. 

 Tabanus mexicanus Smith (not Linn.), 1910, List Ins. New 



Jersey, p. 742. 



This species, as here recognized, is very constant. This is 

 shown by a series of 31 specimens before me. There are 

 rather weak and narrow brown spots at the base of the second 

 submarginal cell and at the bases of the first, second, and 

 fourth posterior cells. The upper branch of the third vein 

 shows a very short stump which appears to be constantly pres- 

 ent. The spots at the apices of the longitudinal veins and the 

 one on the outer branch of the fifth, so characteristic of mexi- 

 canus, are absent in this species. The pile of the mesonotum 

 is either dull white or yellow. 



Tabanus flavus appears to be restricted to the southeastern 

 United States, occurring from New Jersey to Florida and 

 westward to Missouri and Louisiana. Neither of the forms 

 here treated as mexicanus and inanis occurs within this terri- 

 tory. The available actual records are as follows : 



Polk County, Florida, May 5, 4 females (E. A. Schwartz) ; 

 Grasmere, Florida, June 3, 1901, 2 females (C. H. Baker) ; 

 Indian River, Florida, 1 female (H. G. Hubbard) ; St. Lucie 

 (Capron), Florida, April 9, 1 female (Hubbard and Schwarz) ; 



