96 INSECUTOR INSCITI^ MENSTRUUS 



second form, which takes the name flavus Macquart, has much 

 fewer spots on the wings and they are paler and less sharply 

 defined. This is the form which occurs in the southeastern 

 United States. It might be considered as "intermediate" be- 

 tween the clear-winged form (inanis) and the heavily spotted 

 one, as indeed appears to have been generally done, were not 

 such an opinion controverted by the geographic distribution of 

 the three forms. The heavily spotted mexicanus and the clear- 

 winged inams are both restricted to the strictly tropical por- 

 tions of America, while the "intermediate" flavus occurs only 

 in the southern United States, and, as far as our present in- 

 formation goes, does not anywhere occupy the same territory 

 with the other two. The diagnostic characters, distribution, 

 and principal synonymy of the three species follow. 



Tabanus mexicanus L. 



Tabaims mexicanus Linnaeus, 1767, Syst. Nat., ed. 12, vol. 3, p. 



1000. 

 Tabanus olivaceus De Geer, 1776, Mem. pour serv. a I'hist. d. 



Ins., vol. 6, p. 229, pi. 30, fig. 6. 

 Tabanus punctatus Fabricius, 1794, Ent. System., vol. 4. p. 386. 

 Tabanus mexicanus Fabricius (in part), 1805, Syst. Antliat., p. 98. 

 Tabanus mexicanus Wiedemann, 1821, Dipt. Exot., p. 76. 

 Tabanus mexicanus Wiedemann, 1828, Aussereurop. zweifl. Ins., 



vol. 1, p. 147. 

 Tabanus mexicanus (in part), T. olivaceus and T. punctatus 



Townsend, 1897, Ann. & Mag. Nat. Hist., ser. 6, vol. 20, pp. 



22, 23. 

 Tabanus mexicanus Aldrich (in part), 1905, Cat. No. Amer. 



Dipt, p. 205. 

 Tabanus mexicanus Kertesz (in part), 1908, Cat. Dipterorum, 



vol. 3, p. 260. 



This species is at once recognizable by the wing-maculation 

 (see fig. 1). The veins at the bases of the submarginal and 

 posterior cells are heavily marked with black ; the axillary ex- 

 cision of the wing is marked with black along both margins ; 

 there is a large black dot at the apex of the second vein and 

 at the apices of both branches of the third ; there is a blaqk 

 spot on the outer branch of the fifth vein just beyond the discal 

 cell ; the anal cell is marked with black at its apex. Exception- 



