594 PROCEEDINGS OF THE ACADEMY OE [Oct., 



of the wings, cells Kz and 1st M2 longer than cell i?i,- radial and 

 medial veins long and slender; second anal vein incurved at the tip. 

 Limnophila novse-angliae sp. u. 



Belongs to the adiisla Osten Sacken group; wings hyaline; body col- 

 oration yellowish ; abdomen of the male with a black subterminal ring. 



Male, length, 6.8-7.5 mm.; wing, 5.8-7.2 mm. 



Female, length, 8 mm.; wing, 7.5 mm. 



Rostrum' yellowish, palpi brown. Antennie, basal scgiiicnls 

 brownish yellow, the first four or five flagellar segments with the 

 extreme base yellowish, remainder of the antenn;e brown. Head 

 with a broad purplish brown band across the vertex from one eye 

 to the other; occiput rather abruptly reddish yellow. 



Thoracic not um reddish yellow without stripes. PleuraJ lighter 

 yellow. Halteres short, rather pale, the knob only a little darker. 

 Legs, coxse and trochanters yellow, femora and tibje yellow, the 

 tips narrowly brown; metatarsus dull yellowish basally, tipped with 

 brown, remaining tarsal segments brown. Wings with a faint 

 yellowish tinge, a pale brown, oval stigma, no infuscation at the tip 

 of the wing; venation (PI. 1, fig. 4). 



Abdomen brownish j-ellow with a conspicuous subapical Ijlack 

 ring including segments 8 and 9 and the caudal half of 7; liypo- 

 pygium reddish yellow. 



The female sex is similar, but the abdomen lacks the black subapical 

 ring, and in some specimens the entire head is dark purplish brown. 



Holotype, <f, Ellsworth, Hancock C^o., Me., August 10, 1913 

 (Miss Cordelia J. Stanwood). 



Allotj^pe, 9 , topotypic. 



Paratypes, 1 cf, 49 , type-locality, July 9 to August 10, 1913. 



A key to the species of the adusia group in the eastern United 

 States. 



1. Wings more or less clouded with brown apically; often with 



brown seams on the cross-veins 2. 



Wings uniform in coloration, the stigma indistinct 3. 



2. Yellowi-h -]»(i( -.the thoracic notum light yellow adusia O.S.^ 



Brown -])( ( i(-, ihr thoracic notmn dark brown siinilis Wex.^" 



3. Larger species (,wing of male, 9.5 mm.); abdomen without a 



black subterminal ring in the male luiea Doane" 



Small species (wing of male less than 7.5 mm.); abdomen of the 

 male with a black subterminal ring nova-anglicB, sp. n. 



'adusia O.sten Sacken, Proc. Acad. Nal. Sci. Phila., p. 235; 1859. Mon. Dipt. 

 X. Am., vol. 4, pp. 215-217; 1869. 

 '»simi7(.s Alexander; Psyche, vol. 18, pp. 195, 196; 1911. 

 "luUn Doane; Joiirn. N. Y. Enl. Soc, vol. 8, p. 191; 1900. 



