97 
FAMILY SARCOPTIDA* 
A case of Symbiotic mange occurred on a rabbit which was 
imported from Europe for experimental purposes. The condition was 
se\eie and the external ear was entirely filled with the parasites and 
the very profuse epithelial desquamation they had excited. On 
macerating the dead specimens in potash, one finds that they are a 
species of Symbioles (now referred to the genus Chorioptes) and agree 
best with the descriptions given of Symbiotes communis var. cuniculi 
FAMILY DERMANYSSIDvE 
Pnemnonyssus duttoni, Newstead and Todd 
Memoir xviii, Liverpool Sell, 'l'rop. Med. p. 4 (with plate), 11)05. 
Since the publication (l.c.) of the description of the adult mite 
Dr. J. W. B. Hanington has been successful in discovering the earlier 
stages of this acarid, and a description of them is appended below: 
Ovum. Rather narrowly ovoid; faintly yellowish-white and, as 
seen by transmitted light, rather granular in appearance. 
Length -32 mm. 
Hexapod larva. Short ovate, narrowed in front, widely rounded 
behind. Capitulum prominent. Palpi of five segments furnished 
with short slender hairs with the exception of the apical one, which 
has several long stiff hairs ; basal segment broadest, but scarcely 
longer than the apical one; second, third and fourth shortest and 
nearly equal in length ; formula (1,5) (234); tip of the apical segment 
reaching to the middle of the third segment of the anterior legs. 
Legs directed forwards; all the segments with whorls of hairs near 
the articulations, those on the basal segments are mostly short and 
slender, while those on the remaining segments are long and stiff . 
tarsi longer than the two preceding segments; all with very Ion- 
hairs, and a few short slender spines; claws simple, placed on a long 
pedicel which is much narrower at the articulation ; pulvillus scared) 
wider than the dilated claws, but the end extends beyond them. 
Length '50 mm.; width *30 mm. 
c; 
