﻿254 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOO 



short; 4 long and. simple; 5 short, 2- or 3-branched. Siphon very 

 heavily pigmented ; index about 2.5 ; ventral surface straight, dorsal 

 curving from near base to apex, apex about two-fifths of base; five 

 or six single or double spikes laterally and dorsally on each side of 

 the siphon ; 9 to 13 ventral barbed hairs, basal pair usually double or 

 triple, remainder in irregular row, usually simple; a strong apico- 

 dorsal hair; ventral siphonal valve hair minute, simple. Pecten of 

 three or four fringed teeth in basal half. Anal segment with large 

 dark incomplete saddle ; posterior margin of saddle with minute ser- 

 rations; saddle hair simple, stout and barbed; ventral tuft of anal 

 segment reduced to a single pair of stout hairs arising from lower 

 posteroventral margin of saddle; gills longer than anal segment, 

 stout, rounded on apices ; ventral hair of dorsal brush simple, dorsal 

 tuft usually 3-branched. 



Types.— U.S.'^M. No. 59089 (holotype and allotype) : 



Holotype $ (939-32), with larval and pupal skins, bred from larva 

 collected in tree hole, Wliite River Valley, Guadalcanal, April 7, 1945 

 (M.Cohen). 



Allotype 9 (922-2) bred from pupa collected in hollow tree stump, 

 White River Valley, March 21, 1945 (M. Cohen, Winkler) . 



Paratypes (2 ^ , 2 ? ) : 1 9 (939-31), with larval and pupal skins, 

 same data as holotype ; 2 $ (922-201, 202) , with larval and pupal skins, 

 1 5 (922-2), same data as allotype. Paratypes to be deposited in the 

 collections of Cornell University and the Council for Scientific and 

 Industrial Research, Canberra, A.C.T., Australia. 



This species is named for its collector, Murray Cohen. 



Taxonomic discussion. — On the basis of the exclusively narrow 

 wing scaling, long slender proboscis, and unornamented legs of the 

 adults, T. Goheni falls within the limits of the caledonica-gvowp of the 

 subgenus Mimeteomyia and most closely resembles argenteiventris 

 (Theobald) and atra (Taylor) . On the other hand, the larval charac- 

 ters of this species are unique and place it in an intermediate position 

 between the subgenera RacMsoura and Mimeteomyia. The larval 

 maxilla of coheni has three apical spines, one of which is rigid and the 

 others articulated. One of the articulated maxillary spines is almost 

 half as long as the body of the maxilla, which is considerably wider 

 than long. All the described larvae of the subgenus RacMsoura have 

 the largest maxillary spine at least three-fourths as long as the body 

 of the maxilla, which is much enlarged and at least as long as broad, 

 usually considerably longer. None of the described larvae of the sub- 

 genus Mimeteom,yia have spines of any sort on the apex of the maxilla, 

 which is short and considerably wider than long. 



Brug (1934) pointed out that Edwards's (1931) division of rW^^er- 

 oides into subgenera was not adequate, as certain species fall into one 



