492 PROCEEDINGS OF THE ACADEMY OF [Sept., 



6 d' 9 , Scott's and Difficult Runs, Fairfax Co., Va., July 25, 1915 

 (McAtee and Alexander). 



The specific name is that of the Delaware name for the Iroquois. 

 The type, allotype and paratypes Nos. 4, 5, 9, 10, 15 and 16 are in 

 the collection of the author; paratype No. 1 in the collection of Mr. 

 Johnson; paratypes Nos. 2 and 3 in the Museum of Comparative 

 Zoology; the remaining paratypes in the United States Biological 

 Survey collection. 



There is a possibility that this may be Tipida cincticornis Doane, 

 but the description of the latter implies that the outer lobes of the 

 ninth tergite are acute as in Tipida submacidata Loew. Under 

 these circumstances, the present insect must be considered to be 

 distinct. 

 TipuJa monticola sp. n. 



Coloration yellowish; antennae bicolorous; head light gray; 

 thoracic stripes quite indistinct, brownish orange; wings hyaline, 

 the costal region yellowish; male genitalia with the ninth tergite 

 large, the caudal margin deeply U-shaped, bearing a small lobe 

 underneath, the lateral lol^es of the tergite broad, the tip a slender, 

 chitinized point; inner pleural appendage with the caudal arm 

 pointed, the inner arm blade-like, draped on its outer face with a 

 delicate ribbed membrane; eighth sternite with two great tufts of 

 long silvery hairs. 



Male. — Length, 17-18 mm.; wing, 18-19 mm. 

 Frontal prolongation of the head long, rather slender, dull yellow, 

 a little gray above; palpi ])rown. Antennae rather short, the three 

 basal segments yellow, the remainder of the organ with the swollen 

 bases of the segments dark brown, the stem yellow on the basal 

 segments, soon passing into dark brown so that the terminal segments 

 are unicolorous. Head light gray, a narrow blackish median vitta 

 extending backward from the small frontal tubercle, becoming 

 indistinct before the occiput. 



Thoracic dorsum light grajdsh yellow, the praescutum with three 

 brownish orange stripes, the median one broadest in front, more 

 narrowed behind, split by a delicate brown median line on the 

 anterior half; scutum light yellow with the disk of each lobe darker; 

 scutellum light yellow with numerous, long, pale yellow hairs; 

 postnotum pale yellow. Pleura pale yellow, whitish pollinose. 

 Halteres light yellow, the knobs brown. Legs with the coxae whitish 

 pollinose; trochanters yellow; femora dull yellow, brown at the . 

 apex; tibiae yellowish brown; tarsi light brown. Wings hyaline or 



