DELAVALIA. A3 
1. Denavatia patustris, Brady. Pl. L, figs. 1—8. 
Delavalia palustris, Brady. Nat. Hist. Trans. Northumberland 
and Durham, vol. iii, p. 134, pl. v, figs. 
10—15 (1868). 
Rostrum short, broad, somewhat retuse at the apex, 
and having two minute lateral sete. Anterior antenna 
(fig. 2) shorter than the first body-segment, rather 
densely hairy on the distal half, and devoid of a 
flagelium : second joint of the posterior antenna (fig. 3) 
fringed with a series of spine-like hairs on the outer 
margin; inner branch composed of two long, slender 
joints. Mandible-palp (fig. 4) large, all the joints long 
and slender; one of the terminal setze of the main 
branch excessively long. First pair of swimming-feet 
(fig. 6) short, the two branches nearly equal in length; 
inner branch 2-jointed, the second joint being slender 
and about twice as long as the first: each branch 
bears only two slender and moderately long spine-like 
sete at its apex. Basal joint of the fifth pair (fig. &) 
almost obsolete, terminal joints distant, broadly ovate, 
the distal extremity fringed with six subequal and not 
very long setz. Anal operculum protected by two 
curved lines of teeth. Caudal segments more than 
twice as long as broad, distant, and slightly divergent. 
Inner (or longer) tail seta about as long as the 
abdomen ; outer seta half the length of the inner. 
Length goth of an inch (°85 mm.). Male unknown. 
‘The only locality in which I have as yet found this 
Species 1s at the mouth of the Seaton Burn, Northum- 
