Vol. 5, p. 21-26. June 19, 1922. 



Occasional Papers 



OF THE 



Boston Society of Natural History. 



NEW GENERA AND SPECIES OF DIPTERA. 



BY CHARLES W. JOHNSON. 



Macrocera nobilis, sp. nov. Fig. 10. 



Face and front yellow, vertex black; antennae brownish, base yellow, 

 length about 20 mm.; palpi brown. Thorax yellow with fine black hairs and 

 three broad, shining, dark-brown stripes, the dorsal stripe not reaching the 

 scutellum, and the subdorsal stripes ending some distance back of the humeri ; 

 a narrow lateral stripe is also present. Scutellum yellow, base brown, pleura 

 and metanotum brownish, shining. Abdomen yellow with lateral stripes of 

 dark brown, slightly interrupted at the base of each segment; seventh and 

 eighth segments entirely dark; hypopygium brown, base yellow; the entire 

 abdomen with moderately long, black, hairs. Legs yellow, the tarsi somewhat 

 brownish in appearance due to the greater density of the fine black hairs. The 

 front coxae are striped with brown and the middle and hind coxae have a 

 brown spot at their base and apex. Wings hyaline, slightly tinged with yellow ;' 

 tip of R 1 moderately thickened. At the base of R 5 and M 1 and 2 there is a 

 small clouding of brown; toward the base from this is a whitish spot on each 

 side of which the veins are thicker and of a darker brown. Length of <$ 9 mm. ; 

 length of 9 10 mm - 



The male was taken on the carriage road, Mt. Washington, 

 New Hampshire, July 24, 1915, at about 2,000 feet; the female on 

 Mt. Monadnock, New Hampshire, June 22, 1917. Types in the 

 Society's Collection. 



Macrocera trivittata, sp. nov. 



Similar in appearance to M. nobilis. The pleura is entirely yellow, and the 

 apex of the scutellum dark brown, base yellow. The longer hairs of the thorax 

 are arranged in four regular rows above the upper edges of the subdorsal 

 stripes and between the stripes and the base of the wings. The abdomen has 

 in addition to the lateral stripes a prominent dorsal stripe interrupted at the 

 posterior margin of the segments. The hypopygium is darker and more hairy 

 and the knobs of the halteres are brown. Length 7 mm. 



One male, Farewell Creek, southern Saskatchewan, Canada, 

 August, 1887 (Mrs. Varah A. Armstrong). Type in the author's 

 collection. 



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