264 
[October 
1,1; whereas in Oorydalis they are 1,3,21,2,11. The pronotum is sub¬ 
quadrate, with the prothoracic spiracle behind its posterior corner, as 
in Oorydalis; the meso- and metanotum are each 3 times as wide as 
long; all three corneous, glossy, piceous mottled with luteous and with 
a few scattered punctures, whereas in Oorydalis it is only the pronotum 
which is glossy and corneous, the other two segments being almost as 
opaque as the abdomen. The ahdominal joints are opaque, eight in 
number only, joint 1 half as long as each of the rest which are sub¬ 
equal. Joints 1—7 have each a lateral, sub terminal, exarticulate, fleshy 
seta nearly at right angles to the body and about as long as the body 
is wide, immediately above and behind which is the spiracle which is 
very distinct; joint 8 has the same seta as the rest but no spiracle. 
In Sialis, on the contrary, the lateral setae are said to be articulate and 
have been supposed to act as branchiae. Upon the dorsum of each 
joint, a little before the middle, is a very distinct transverse suture, 
and behind it at regular intervals two others less distinct, indicating 
apparently the normal subsegments. From the tip of the last segment 
there proceeds a pair of appendages, contiguous, and exactly similar to 
those of Oorydalis^ viz., a robust fleshy pillar, more than half as long 
as one of the abdominal joints, at the tip of which is a pair of long, 
curved, horny, shining claws above, and a fleshy, tapering seta below 
twice as long as the claws. Above these two appendages is a pair of ro¬ 
bust, fleshy, exarticulate setm, similar to those of Acheta, but closely 
contiguous and tapering much less rapidly, i millimetre in diameter at 
base and probably at least 10 or 12 millimetres long, the unbroken por¬ 
tion in my specimen measuring 6 millimetres. Legs dark luteous; 
the tarsi one-jointed and as long as the tibiae, with no appearance of 
any sutures and with two terminal claws. 
Besides the points above specified this larva differs from that of 
Oorydalis in three other respects: Is^, Oorydalis has a 9-jointed, not 8- 
jointed abdomen, 1—8 having the same lateral seta and spiracle as 1—7 
in Ohauliodes, and 9 having neither seta nor spiracles. 2/«-(i, Oorydalis 
has no caudal setae, nor even any rudiments of them, so that Ohauli¬ 
odes forms a connecting link in this respect between that genus and 
Sialis, the larva of which is said to have “ one long, slender, setose tail.” 
(Westw. Intr. II, p. 50.) 3rJ, the venter of Ohauliodes is simple, and 
entirely destitute of the remarkable paddle-like branchiae found in Oory- 
