1914.] NATURAL SCIENCES OF PHILADELPHIA. 595 



The members of the adusta group are distinguished by the follow- 

 ing characters: radial sector short, arcuated; cross-vein r situated 

 at about mid-length of Ri which is quite oblique. The species are 

 yellowish or brown and specimens in a single species vary much in 

 the intensity of their coloration. 



The following species have been examined and prove to belong 

 to this group of the genus: 



Limnophila fidvocostalis Coquillett/^ from Bering Islands, type 

 4,049 U. S. N. M. 



Limnophila costata Coquillett/^ from New Mexico, type 5,318 



u. s. n.'m. 



Limnophila insulana Johnson,^^ from Bermuda, type in the collec- 

 tion of Mr. Johnson. 

 Limnophila stanwoodae sp. n. 



Belongs to the quadrata Osten Sacken group; body-coloration 

 yellow; wings pale yellow; Rs long, cell il/i absent. 



Male, length, 6.6-6.9 mm.; wing, 7.5-7.9 mm. 



Female, length, 6.8-7.2 mm.; wing, 6.8-7.3 mm. 



Rostrum yellowish, palpi with the basal segments light colored, 

 terminal two brown. Antennae with the scape yellow, flagallum 

 brown, the proximal half of the first two flagellar segments yellowish. 

 Head reddish yellow. 



Thorax brownish yellow without distinct dark lines, the post- 

 notum with a narrow indistinct median stripe of brown. Pleurae, 

 pro-pleurae darker, the meso- and metapleurae light yellow. Halteres 

 pale yellow. Legs, coxae and trochanters light yellow, femora 

 brownish yellow darkening into brown at the tip, tibiae light brown 

 darker at the tip, tarsi dark brown. Wings with a light yellow tinge, 

 the stigma gray, oval, veins brown, the radial cross-vein mostly 

 obscured bj- the stigma; venation (PI. XXV, fig. 5). 



Abdomen brownish yellow, the lateral line brownish; sternites 

 a little brighter yellow; segment 8 and the caudal half of the 7th 

 brown; hypopygium yellowdsh; valves of the ovipositor of the 

 female long, acicular. 



Holotype, cf , Sacandaga Park, Fulton Co., N. Y., June 11, 1914. 



Allotype, 9 , topotypic. 



Paratypes, 3 cf , 18 9, Ellsworth, Hancock Co., Me., June 21- 

 July 23, 1913. 



12 Fur Seals and Fur-Seal Islands, vol. 4, p. 342; 1899. 

 ^^ Psyche, vol. 9, p. 149; 1901. 



"The Dipteran Fauna of Bermuda, Annals of the Entomological Society of 

 America, vol. 6, pp. 443, 444, fig. 2; 1913. 



