STENHELIA. oe 
the first thoracic segment, and produced into a long 
curved rostrum (fig. 1). Abdomen (fig. 1) 5-jointed, 
the first two joints not coalescent. Anterior antenna 
8-jointed, the second joint reaching to the extremity 
of the rostrum; the fourth joint is somewhat longer 
than the preceding three, and the last four are much 
shorter and more slender, their entire length being 
only equal to that of the two preceding joints; the 
second, third, fourth, and eighth joints each bear several 
apical setz, the other joints very few. Middle joint of 
the inner branch of the posterior antenna (fig. 4) very 
small. The second foot-jaw (fig. 8) has two spine-like 
setz on the inner margin of the slender, oblong hand. 
Outer margins of the swimming-feet densely fringed 
with spine-like setz ; first jomt of the inner branch of 
the first pair elongated, nearly twice as long as the two 
following joints ; second joint smaller than the third ; 
the outer branch scarcely reaches beyond the apex of 
the first joint of the inner branch; branches of the 
second, third, and fourth pairs all 3-jointed and nearly 
equal, jomts long and slender (fig. 10). Fifth pair 
well developed (fig. 12), basal jomt broad and long, 
fringed with small hairs and provided also with five 
stout plumose setze on the apex and internal margin ; 
second joint broadly ovate, bearing five marginal setz. 
The third segment of the abdomen is the shortest, the 
fourth the longest; caudal segments about as long as 
broad ; outer terminal setz very thick for the first 
half, then suddenly tapering to a hair-like fineness 
(fig. 14); inner sete about twice as long, stout and 
shortly plumose. 
VOL. II. 6 
