14 



tarsi bnmn, i)ulvilli white. Halteic- liglit yellow. Wings hyaline, veins 

 brown. Length d", 3.5 mm.; 9 , 4 mm. 



Twelve specimens: holotype and allotype, Chatham, Massachusetts, June 

 30, 1904, and four paratypes, Chatham and Edgartown, Massachusetts, June 

 29, 1910, in the collection of the Boston Society of Natural History. Para- 

 tijpes from Chatham, Massachusetts, and St. Augustine, Florida, April 18, 1919, 

 in the collection of the Museum of Comparative Zoology, the American Mu- 

 seum of Natural History, and the author's collection. 



Some of the Florida specimens have the ^antennae, palpi, front 

 coxae, and the tarsi slightly darker than those from Massachusetts. 



Psila longula, sp. nov. 



Front, face, inferior orbits and antennae yellow; aristae and mouth-parts 

 brown; vertex and occiput black, shining; frontal and vertical bristles and 

 hairs on the lower part of the occiput light yellow. Thorax black, with short 

 yellow hairs; pleura, metanotum and scutellum shining black, the last 

 with two apical bristles. Abdomen black with yellow hairs. Legs yellow, 

 tips of the posterior femora brown. Halteres white. Wings hyaline, veins 

 brown, the apex slightly brownish, with fainter tinge of brown near the pos- 

 terior cross-vein. Length cf, 5 mm.; 9, 6 mm. In some specimens of the 

 female the black encroaches upon the front. 



Fifteen specimens: holotype and allotype, Chester, Massachusetts, August 6, 

 and July 25 (C W. J.) and the following paratypes: Northeast Harbor, July 

 16 {Dr. C. S. Minot), Bar Harbor, July 24, and Fort Kent, Maine, August 17; 

 Mt. Washington, New Hampshire, 3000 ft., July 28; Norwich, July 7, and 

 Dummerston, Vermont, July 14 (C. W. J.), in the collection of the Boston 

 Society of Natural History. Other paratypes from the above localities are 

 in the U. S. National Museum, Museum of Comparative Zoology, Academy of 

 Natural Sciences, Philadelphia, and the author's collection. 



This has probably been confused with P. levis Loew, but the dark 

 veins and clouding on the wings and the dark tips to the posterior 

 femora readily distinguish it from that species. 



Chyliza nubecula, sp. nov. 



9 . — Face and inferior orbits white ; the lower two-thirds of the front 

 yellow; upper parts of the front, vertex and occiput black, subshining; anten- 

 nae and aristae brown. Thorax and abdomen black with piligerous punctures, 

 the pile of the thorax black, and of the abdomen whitish; scutellum black, 

 shining. Legs black; front coxae, the outer half of the tibia, and all the 

 metatarsi, yellowish. Halteres and calyptrae white. Wings hyaline; veins, 

 stigma, and the apex forward of the third vein brown. Length 4.5 mm. 



Three specimens: holotype, Northeast Harbor, Maine, July 6, 1909 {Dr. 

 C. S. Minot) in the collection of the Boston Society of Natural History. Para- 

 types: Edmonton, Alberta, July 12, 1916 {F. S. Carr) in the National Museum, 

 Ottawa, Canada; and High River, Alberta, July 15, 1921, collected by Mr. 

 Owen Bryant, in the author's collection. 



