﻿224 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lOo 



Abdomen (fig. 35, &, c) : Stellate tufts poorly developed, very small, 

 inconspicuous. On first segment two stellate tufts on each side dor- 

 sally, arising from a common basal tubercle; on follov^ing segments 

 (fig, 35, b) the stellate tufts are reduced to a single pair dorsolaterally, 

 with a short simple hair usually present in front of tuft but not arising 

 from a basal tubercle, except occasionally on segments 2 and 3 ; tufts 

 with four to six barbed branches. Comb composed of 6 to 11 j)ointed 

 teeth with strong basal denticles. Pentad hairs weakly developed, ex- 

 cept for hair 1, which is a stellate tuft of 5 to 12 branches arising from 

 a basal tubercle ; hair 3 usually 4-branched ; 5 usually double ; 2 and 4 

 usually simple. Siphon very heavily pigmented, usually black ; acus 

 absent ; index 3 or slightly more ; parallel-sided at basal fourth, then 

 attenuated to about third of basal width at apex ; pecten of six to nine 

 strong, heavily pigmented, simple teeth (occasionally with minute 

 barbs) , pecten usually absent from basal third, but extending to apex; 

 an irregular double row of 10 to 12 dorsal hair tufts, each usually with 

 four barbed branches about as long as basal diameter of siphon ; 11 to 

 16 ventral hair tufts, the basal two are paired and 6- to 8-branched, 

 remainder usually in an irregular single row and 3- to 5-branched, all 

 minutely barbed ; a strong, curved, apicodorsal hair ; ventral valve with 

 a long 2- to 4-branched hair. Anal segment with a small black, in- 

 complete saddle, posterior margin with four or five small denticles; 

 saddle hair simple, stout, and long ; ventral brush reduced to a pair of 

 tufts, each with six to eight very long, barbed branches ; dorsal brush 

 very long, hairs barbed, ventral subcaudal tuft simple, dorsal with 

 seven or eight branches; gills longer than saddle hair, attenuated, 

 occasionally dorsal pair shorter than ventral. 



Types. — U.S.N.M. No. 59086 (holotype, allotype, and paratypes) : 



Holotype 5 (260-12), allotype ? (260-14) with larval and pupal 

 skins, bred from larvae collected in taro leaf axils, Matanikau River 

 Valley, Guadalcanal, March 13, 1944 (L. J. Lipovsky, A. W. Barnes). 



Paratypes (23 5 , 33 $ ) all bred from larvae and pupae collected in 

 taro leaf-axils in various river valleys on Guadalcanal, as follows : 1 $ 

 (260-13), 2 $ (260-11, 15) with larval and pupal skins, 3 5,35,1 

 larva (260), same data as holotype and allotype; 3 2 (160), White 

 River, January 19, 1944 (S. Civinski) ; 1 9 (254), Matanikau River, 

 March 10, 1944 (JNB) ; 2 5 , 1 $ (336) Lunga River, April 28, 1944 

 (F. B. Wysocki) ; 1 5 , 2 larvae (372), La Sage Creek, May 10, 1944 

 (L. J. Lipovsky) ; 1 $ (392-4) , Marine Creek, Matanikau, May 19, 1944 

 (J. J. Cuccio) ; 2 5 , 2 $ (418) La Sage Creek, May 30, 1944 (V. R. 

 Roa, F. B. Wysocki) ; 2 $ (541-14, 15) with larval and pupal skins, 

 1 larval and pupal skin (541-12), Marine Creek, Matanikau, July 31, 

 1944 (L. J. Lipovsky, M. Cohen) ; 1 5 (560), Matanikau, August 4, 

 1944 (L. J. Lipovsky) ; 1 $ (625-12) , 3 $ (625-11, 13, 14) with larval 



