May, 191/] Xoiih American Tahanidce 271 



rather small and of unifonn size throughout, venter brown darker 

 toward the apex and sparsely gray pollinose. Total length, 19 to 22 

 millimeters. 



Feinale — Front moderately wide, sHghtly narrowed below, frontal 

 callosity shining brown, above with a narrow i)rolongation which is 

 soniewhat expanded apically, remainder of the front and the face gray 

 pollinose. 



Male — Colored like the female, head of normal size, eyes with small 

 facets below and with an extended area of enlarged facets above, 

 antenna somewhat slenderer than in the other sex. 



Holotype female in the Ohio State University collection 

 taken in Jackson County, Kansas, by J. H. Schaffner. Allotype 

 from Missouri. Twenty other specimens from Kansas, Missis- 

 sippi, Louisiana and x\labama. 



The species has been in my collection for several years and 

 for a time it was labeled molestus. It appears entirely distinct 

 from molestus, however, for it is a browner insect, the femora 

 are not black, the abdominal triangles are generally smaller and 

 of uniform size, and the wings are quite differently colored. 



Tabanus nantuckensis n. sp. 



Female — Ej^es bare, front wide, subcallus denuded and shining 

 black, frontal callosity shining black and decidedly broader than high. 

 Whole body and all the appendages black with the exception of the 

 extreme base of the anterior tibia which is pale, and the wings which 

 have the anterior half or more brown. The division between the brown 

 and black of the wings is not regular but approximately all the posterior 

 cells, the discal cell and the axillary cell are wholly brown, while the 

 basal cells and the anal cell have their apexes narrowly brown. Total 

 length, 20 millimeters. 



Holotype female taken by Benjamin Albertsen, of Phila- 

 delphia, on Nantucket Island, Massachusetts, August 14, 1916. 

 In Ohio State University collection. I have five other females 

 and have seen two others, all taken on the same island by the 

 same collector. 



It is near atratus in many respects and might be considered 

 as a variety of that species, but the smaller size and different 

 wings give it a very different appearance. 



There is reason to believe that this insect has become isolated 

 on the island for it has not been taken elsewhere so far as I can 

 find. Mr. Albertsen writes that he has taken several specimens 

 through a series of years and has found that they are uniformly 

 the same. With a knowledge of these facts I have chosen to 

 consider this and atratus separate species. 



