594 PROCEEDINGS OF THE ACADEMY OF [Oct., 



of the wings, cells Rs and 1st Mo longer than cell Rf,; radial and 

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

 Limnophila novae-angliae sp. n. 



Belongs to the adusta Osten Sac ken 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. Antennae, basal segments 

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

 extreme base yellowish, remainder of the antennse brown. Head 

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

 to the other; occiput rather abruptly reddish yellow. 



Thoracic notum reddish yellow without stripes. Pleurae lighter 

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

 Legs, coxse and trochanters yellow, femora and tibse 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 yellow with a conspicuous subapical black 

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

 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, d" , Ellsworth, Hancock Co., Me., August 10, 1913 

 (Miss Cordelia J. Stanwood). 



Allotype, 9 , topotypic. 



Paratypes, 1 c^, 4 9 , type-locality, July 9 to August 10, 1913. 



A key to the species of the adusta 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. Yellowish species, the thoracic notum light yellow adusta O. S.^ 



Brown species, the thoracic notum dark brown swiilis Alex. ^'■' 



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



black subterminal ring in the male lutea Doane^^ 



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

 male with a i^lack subterminal ring novce-anglice, sp. n. 



^adusta Ostcn Sackcn, Fror. Acnd. Nat. Sci. Phila., p. 235; 1859. Mon. Dipt. 

 N. Am., vol. 4, pp. 215-217; 18G9. 



^Himilis Alexander; Psyche, vol. 18, pp. 195, 196; 1911. 

 ^Hutea Doane; Journ. N. Y. Ent. Soc, vol. 8, p. 191; 1900. 



