Vol. 5. p. 11-17. fi/7^(pvF,i4^ER 9. 1921. 



Occasional Papers 



OF THE 



Boston Society of Natural History. 



xp:w species of diptera. 



BY CHARLES W. JOHNSON. 



The following new species have acciiinulated in connection with 

 some faunistic work in course of preparation. 



Chaoborus albatus, sp. nov. 



cf . — Head white; around the base of the antennae, the tips of the palpi and 

 proboscis brown; the plumose antennae white, the joints narrowly annulated 

 with black. Thorax white, with long whitish hairs, and three broad brown 

 stripes, the dorsal stripe narrowly divided, the others not extending forward 

 of the suture; two small brown spots in front of the suture and a row of spots 

 on the pleurae, the latter forming an interrupted stripe below the base of the 

 wings; scutellum white, metanotum dark brown. Abdomen white, trans- 

 lucent, with long white hairs; a small brown spot on the anterior angles of 

 each segment; genital appendages yellow, tipped with brown. Halteres white. 

 Legs white, the extreme base of the front femora, a subapical band on all of 

 the femora, and the tips of all the tibiae and tarsal joints brown. Wings 

 whitish-hyaline, with conspicuous brown spots at the tips of the first and second 

 veins but less distinct at the tips of the other veins; distinct spots are also 

 present at the base of the third vein, the cross-vein, and fork of the fifth vein. 

 Length 5 mm. 



One male and three females, holotype and allotype, Brookline, Massachusetts, 

 June 18, and one paratype, Mt. Tom, Massachusetts, July 14, 1907 (C. W. J.), 

 in the collection of the Boston Society of Natural History. One paratype, 

 Brookline, Massachusetts, in the author's collection. 



This resembles C. punctipennis Say, but that species has more 

 numerous spots on the wings and the femora and tibiae are finely 

 punctate with black. 



Tabanus pemeticus, sp. nov. 



9 . — Front brownish pollinose with short black and yellow hairs, frontal 

 and ocelligerous tubercles wanting; cheeks and middle of the face whitish, 

 with the sides yellowish pollinose; hairs on the cheeks long and white. I'he 

 first and second joints of the antennae yellow with black hairs, third joint 

 reddish brown, with prominent angle above; palpi white with black hairs; 

 eyes pubescent. Thorax, scutellum, and abdomen blackigh with golden-yellow 

 tomentum and black hairs, pleura whitish pollinose and with long white hairs, 

 .sides of the first and second segments of the abdomen slightly yellow; venter 

 grayish pollinose. Legs yellow with black hairs, coxae and base of the middle 



