1919] Johnson — New Species of the Genus Ulidia 165 



These varietal names may seem perhaps unnecessary, hut when 

 one has already been referred to as a species by one of our leading 

 authorities in this family, it shows how striking the variations are 

 when isolated. There is a peculiar significance in the fact that 

 these variations are apparently confined to the immediate seaboard, 

 and their abundance there would indicate that they probably 

 breed in the adjacent salt or brackish marshes. The question arises 

 do these diversified conditions affect the species and give rise to 

 these variations. On the other hand there is a similar though less 

 pronounced variation in Tabanus trispilns. From New Jersey 

 southward is found the typical form with dark brown wings, but 

 to the northward the wings are much lighter in color, representing 

 the var. sodnlis Will. Another Tabanid, Chrysops fuliginosus or 

 plangens, wdiich is strictly a coastal species, distributed from Maine 

 to Florida, shows considerable variation in the color of its wings, 

 even in the same sex. Florida specimens have a distinct subhyaline 

 streak dividing the apical spot from the crossband. Specimens 

 from New Jersey northward have the brown of the wings more dif- 

 fused and the streak less clearly defined. 



A NEW SPECIES OF THE GENUS ULIDIA. 



By Charles W. Johnson, 

 Boston Society of Natural History. 



In a collection of Ortalidae sent to me by Mr. E. P. Van Duzee 

 for determination was the following apparently new species. 



Ulidia similis sp. no v. 



Head red, front punctate, each puncture bearing a short black 

 hair, orbits pruinose, ocellar triangle black, one inner and one outer 

 vertical and two post-vertical bristles, antennse, palpi and pro- 

 boscis reddish, arista blackish, thickened at the base. Thorax 

 reddish, the disk black, covered with a grayish pollen and showing 

 in a certain light two narrow dark vittse, pleura red, between the 

 front and middle coxse blackish, two post-humerals, one pre-sutural, 

 two supra-alar, one dorso-central, one notopleural, onemesopleural, 

 and one sternopleural bristle, scutellum red, tips of the tarsi 



