ISOSTOMYIA 187 



Edwards of the British Museum for information. He kindly replied as follows 

 (in litt., January 6, 1913) ; "Unfortunately the type of Goeldia fluviatilis has 

 disappeared from our collection, like several others. What has happened to it 

 I do not know, unless Theobald has removed it for further examination ; per- 

 haps he never really placed it here." The female specimen Mr. Edwards finds to 

 be in the collection, but as the male is stated to be the type and the female prob- 

 ably is wrongly associated, we are obliged, from lack of information, to leave 

 the name Goeldia unplaced. 



Genus ISOSTOMYIA Coquillett. 

 Isostomyia Coquillett, U. S. Dept. Agr., Bur. Ent, Tech. ser. 11, 16, 24, 1906. 

 The type species is Aedes perturbans Williston by original designation. 



Oeiginal Desceiption of Aedes pektubbans: 



/Edes perturhans Williston, Trans. Ent. Soc. Lend., 271, 1896. 



J", 5. Head black. Antennae brown; plumosity of the male long, abundant and 

 black; terminal joint as long as the seven or eight preceding it together, and clothed 

 with short hair; in the female the joints are more slender, and the terminal one is 

 not longer than the two preceding it taken together, the verticils of moderate length. 

 Proboscis black, as long as the abdomen; palpi brown. Thorax yellow, the meso- 

 notum a little darker, and clothed with brown squamulae. Abdomen yellowish, 

 brownish-yellow or brown, the terminal segments and the hypopygium brown or 

 blackish ; clothed above with brown squamulae. Legs brown or blackish, the femora, 

 for the most part, yellow, and with a purplish or greyish reflection in some lights; in 

 some specimens the tibiae largely yellowish beneath the tomentum. Veins of the 

 wings uniformly dark-brown squamulate. Length 4-5 mm. 



Eight specimens. 



Island of St. Vincent, West Indies. 



Mr. F. W. Edwards informs us (in litt., October 30, 1912) that the type of 

 /. perturbans (Williston) is in the British Museum, rather damaged, but a 

 typical sabethine, differing from Lesticocampa in having short palpi in the male. 

 The palpi are short in our species, Lesticocampa dicellaphora, so it is probable 

 that Isostomyia is a synonym of Lesticocampa. We have omitted the name from 

 the synonymy (page 162), as we are autoptically unacquainted with the type 

 species, perturbans, and find Dr. Williston's description insufficient. This may 

 prove an earlier name for our dicellaphora, but the localities are remote, pertur- 

 bans being described from the island of St. Vincent, dicellaphora from Panama. 

 We do not feel justified in making even a tentative reference. We treat Willis- 

 ton's perturbans as the type of Isostomyia because it is the only species included 

 by Coquillett, although the characters which he gives were taken from a Culex 

 which he erroneously supposed to be Williston's perturbans. See the discussion 

 under Culex conservator (p. 219) for statement of Coquillett's erroneous identi- 

 fication of Aedes perturbans. 



