The Chonaphini 187 



(11.2 km) northeast of Gasquet, Del Norte County, California. Seven 

 male and 4 female paratypes deposited in NCSM. 



Diagnosis — Acropodite directed strongly submediad, blade-like 

 throughout length, narrowing slightly distad, curving distinctly downward 

 or dorsad distally, without trace of sinusoid curvature. 



Color in life — Unknown. 



Holotype — Length 24.6 mm, maximum width 3.9 mm, W/L ratio 

 15.9%, D/W ratio 76.1%. 



Somatic features agreeing with those of S. sinuata, with following 

 exceptions: 



Width across genal apices 2.8 mm; interantennal isthmus 0.9 mm. 

 Relative lengths of antennomeres 2>3>6>4>5>1>7. Facial setae as follows: 

 epicranial 2-2, interantennal 1-1, subantennal 1-1, frontal 1-1, genal 

 2-2, clypeal about 13-13, labral about 18-18. 



Collum terminating at same level as succeeding tergite. Caudolateral 

 corners of paranota angular on segments 2-3, blunt on 4-6, rounded 

 on remaining tergites, becoming progressively angled caudad in caudal 

 half of body. 



Sides of metazonites with irregularly serrate ridges subtending 

 coxae through segment 9, becoming progressively indistinct thereafter. 

 5th sternum with low, rounded elevated areas between 4th legs, slightly 

 depressed between 5th; 6th sternum depressed between both legs to 

 accommodate telopodites. Prefemoral spines present on legs of segments 

 13-18, short and indistinct. 



Gonopodal aperture broadly rounded, without indentations, 1.2- 

 mm wide and 0.6-mm long at midpoint, anterior margin flush with 

 metazonal surface, sides elevating slightly caudad and continuing onto 

 caudal margin, latter extended slightly caudad. Gonopods in situ (Fig. 

 64, of paratype) with acropodites curving broadly submediad, tips nearly 

 overlapping, extending well beyond anterior margin of aperture and 

 overhanging 6th sternum. Gonopod structure as follows (Figs. 65-66): 

 Coxae moderately-large, nearly equal to telopodite in overall bulk, 

 connected by membrane only, with 2 macrosetae above cannula and 

 moderate cluster of setae below. Prefemur relatively short and broad, 

 with moderately long prefemoral process arising anteriad, about half 

 as long as acropodite, broad basally, bent slightly dorsad and twisted 

 at 2/3 length, broad apically. Acropodite arising at slight constriction 

 of prefemur, moderately broad basally, directed submediad, con- 

 figuration a moderately broad arch, curving broadly at midlength, sides 

 narrowing smoothly and continuously to subacuminate tip. Prostatic 

 groove arising in pit in prefemur, running along medial side of latter 



