208 
c. 23 spread fissures; the dorsal side of the abdomen 
almost like the ventral side, but for the rest the drawing 
(Tab. IV, fig. 12) gives so full an idea of the distribu- 
tion of the fissures that most likely a further descrip- 
tion would not be necessary. 
2) Obisium muscorum, Leach. 
Ist and 2d pair of legs. 
lst joint. On the posterior side near the apical 
margin 1 rather long longitudinal fissure. 
2d joint. On the dorsal side 4—6 long longi- 
tudinal fissures converging towards the apex and col- 
lected into one organ (Tab. V, fig. 1). 
3d joint (pars basalis femoris, see later on). On 
the dorsal side near the apex 1 long longitudinal fissure, 
at the middle or towards the basis 1 shorter and a 
little removed from the basis 3 short, spread fissures. 
4th joint (pars tibialis femoris). On the dorsal 
side slightly removed from the apex 3 unequally long 
longitudinal fissures, situated at a distance from each 
other. 
dth—7th joint. No fissures are found. 
3d and 4th pair of legs. ; 
lst and 2d joint with the same fissures as on 
the 2 foremost pairs of legs. 
3d joint (trochantin). On the proximal half of the 
lower side 2 or 3 shorter longitudinal fissures spread 
lengthwise on the joint. 
4th joint (femur). On the dorsal side somewhat 
removed from the apex 3 long longitudinal fissures of 
a similar form and almost relative position as 
on the pars tibialis femoris of the 2 anterior 
pairs of legs. 
Maxille. 
On the lower side towards the exterior side 
