12 



and posterior femora black, the anterior coxae with long white hairs; tips of 

 the front tibiae and tarsi brown, the tips of the middle and posterior tarsal 

 joints annulated with brown. Wings hyaline; costal cell yellow, veins brown; 

 anterior branch of the third vein with a prominent stub. Halteres yellow. 

 Length 13 mm. 



The male differs from the female in being grayish pollinose with long gray- 

 ish hairs, with yellowish tomentum on the sides and posterior margins of the 

 abdominal segments. The femora except the tips, the frontal and middle 

 tibiae and tarsi black. Length 13 mm. 



A third specimen (female) has the third antennal joint dark yellow, a very 

 small black shining frontal callous, the branch of the third vein angulate but 

 the stub wanting. Length 13 mm. The stub is also wanting in a teneral 

 male, length 11 mm. A female from Newfoundland, measuring 11 mm., 

 resembles the type except that the antennae are a dark orange yellow. 



Five specimens: holotype, 9, Southwest Harbor, Maine, August 20, 1920 

 (C. W. J.); allotype, &, Northeast Harbor, Maine, July 22, 1918 (Dr. C. S. 

 Minot); paratypes, 9, Mt. Cadillac (Green Mt.), Mt. Desert, Maine, August 

 17, 1920, and cf , Southwest Harbor, Maine, July 15, 1918 (C. W. J.), in the 

 collection of the Boston Society of Natural History. One 9 , Little River, 

 Newfoundland, July 23, 1905 {Percy G. Bolster) in the author's collection. 



The name is derived from Pemetic, the Indian name for Mt. Desert, 

 where four of the specimens were collected. The species belongs to 

 the group comprising T. bicolor Wied, T. ohioensis, and T. thoracicus 

 Hine, and may prove to be only a large maritime form of the last. 

 The larger size, the marked difference in the color of the pilosity of 

 the dorsal and \ entral surfaces, the dark-brown veins, and the promi- 

 nent stub or angle to the branch of the third vein seem (with the 

 material at hand) to separate it from that species. 



Dipalta banksi, sp. nov. 



D. serpentina Osten Sacken, West. Dipt., 1877, p. 237 (in part); Johnson, 

 Bull. Amer. Mus. Nat. Hist., 1913, vol. 32, p. 57. 



Front black, with yellow tomentum and black hairs, face brown, with black 

 and yellow hairs; first and second joint of the antenna brown, third black, 

 the third joint and style less attenuated than in D. serpentina. Thorax black 

 covered with a dark-yellow tomentum, pile on the sides yellow and black, on 

 the pleura light yellow. Abdomen black with yellow tomentum, pile on the 

 sides of the first and second segments light yellow, pile on the posterior and 

 remaining segments black. Legs brown with yellow tomentum and black 

 si)ines. Halteres brown. The markings on the wings are dark brown and 

 more diffvised than in D. serpentina, but the chief difference is in the venation, 

 the second longitudinal vein being less sinuous, as shown in Fig. 2. It is also 

 smaller, 7 to 9 mm. 



Holotype; Great Falls, Virginia, September 12; paratypes, Fall Church, 

 Virginia, September 7, Great Falls, Virginia, July 8, all in the Banks Coll. 

 (Mus. Comp. Zool.). St. Augustine, Florida, in the author's collection. 



