50 Journal New York Entomologigal Society. [Vol. vr. 



DIPTERA FROM THE LOWER RIO GRANDE OR 

 TAMAULIPAN FAUNA OF TEXAS— II.* 



By C. H. Tyler Townsend. 



TABANIDyE. 

 Tabanus atratus F. 



Twoi? $ . April 1 6, and July n. Brownsville, Texas. 

 The eyes are slightly pubescent. First posterior cell completely 

 closed, very short petiolate. Length, 20 to 22 mm. 



SYRPHID.E. 

 Eupeodes volucris O. S. 



One $ . May 2. Brownsville, Texas. Taken on foliage. 



Length, 7 mm. Has ground color of abdomen brown, instead of 

 black. This record extends the range of this species very considerably 

 It is a characteristic species of the Plains, belonging distinctively to the 

 Upper Sonoran subregion, and is one of those species which indicate 

 the extension of the dilute Upper Sonoran to the Lower Rio Grande 

 region. There is a certain element of Upper Sonoran present in the 

 Tamaulipan fauna; and it is interesting to reflect that the dilute Upper 

 Sonoran reaches to, and actually meets and mixes with the dilute Neo- 

 tropical here on the Lower Rio Grande. 



Baccha tropical is Towns. 



This species was described in Section I. It is most nearly allied to 

 B. notaia Loew of Cuba, a specimen of which from Florida has recently 

 been identified by Mr. W. D. Hunter (with Dr. Williston's assistance). 

 The Florida specimen, while stated to be a $ (Can. Ent. April, 1896, 

 p. 97), possesses the peculiarities of wing coloration and abdominal 

 markings distinctive of the 9 of tropicalis. If it be a $ , it is certainly 

 a most aberrant one, judging from the usual sexual characters in this 

 Neotropical group of Baccha. 



Note. — While referring here to Mr. Hunter's papers, I wish to 

 point out a few errors that he has made. In the Can. Ent. for April, 

 1896, p. 96, he states that up to that time there had been recorded only 

 one specimen of Baccha tarchetius Walker, besides the type in the 

 British Museum ; and that that specimen was from New Jersey, col- 

 lected by Mr. Keen, and is now in the National Museum. If he will 

 refer to the Trans. Am. Ent. Soc. for March, 1895, p. 38, he will find 



* Section I of this paper appeared in Journ. N. Y. Ent. Soc. 1897. 



