46 Jan S. Doughman 



Sympotthastia fulva (Johannsen) 



Diamesa fulva Johannsen, 1921:229, orig. design, (holotype female 

 description). 



D. {Psilodiamesa) fulva Jon., Johannsen, 1937:33-34 (description of 

 pupa, Fig. 91; description of larva, Figs. 92-96; keys; also noted that 

 male and female imago descriptions were associated with the imma- 

 ture stages); Pagast, 1947:51 1-512, 569 (remarked that this species lies 

 within Sympotthastia; Thienemann, 1952:248 (keyed it near Potthas- 

 tia gaedii). 



Psilodiamesa fulva Jon., Johannsen and Townes, 1952:13. 



D. fulva Jon., Roback, 1957:51, 53 (keys); Sublette, 1964:129-130 

 (color description of a female that is perhaps this species); Sublette 

 and Sublette, 1965:276 (distribution); Sublette, 1967:480-483 (sup- 

 plemented description of female and male with accurate figures of 

 male hypopygium). 



Sympotthastia fulva (Jon.), Saether, 1969:34 (description of a probable 

 new species near this one); Serra-Tosio, 1971:281 (placement within 

 genus near S. spinifera); and Hansen and Cook, 1976:142 (generic 

 placement). 



Larva. — Head yellowish and thinly sclerotized without flecks of 

 reinforcing chitin. Mentum as described for genus; specifically, ventro- 

 mentum yellow and VmP absent. AR 1.5; A | length/ width (ALAW)= 

 3; antenna to mandible 6:10. Contrasted to S. zavreli below, the SI is 

 shorter, wider and more blade-like; SII subequal to SHI; LL two non- 

 denticulate plates. Premandible with 1-2 lateral teeth. Mandible as in 

 Potthastia spp., i.e., somewhat sickle-shaped, toothed area dark, and 

 four, subequal laterals set in as a group. Si with 20 finely serrated 

 branches, proximal ones longest. Maxilla as in Johannsen (1937: Fig. 

 94). Body 7 mm. Procercal height/ width (H/W)= 0.8. Seven AS, 1.5X 

 longer than supraanal setae. TA three-fourths the length of parapod. 

 Posterior parapod with the nominal 16 claws {versa Johannsen 1937:33). 



Material. — USA: New York, Tompkins Co., Cascadilla Cr. at 

 Cornell Univ., Ithaca. Paratype female, pinned; allotype male hypopy- 

 gium and antenna and pupal and larval skin, Cornell Univ. no. 2326, 

 slide mounted (specimens squashed), and the remainder of the pinned 

 male was slide mounted in Euparal. 



Sympotthastia cf. fulva (Joh.) 



Larva (4th stadium, N=l). — Fig 6. Head rather robust, brown with 

 flecks of heavier sclerotization. AR 2.2; blade fused nearer to base of A 2 

 than in fulva, resembling zavreli. Body length and color indeterminate. 

 Remaining characters identical to that of fulva. 



Material. — USA: Alaska, Happy Valley Cr. (Sagavanirktok R. 



