List of the Colydiidee collected in the Amazons Valley. 79 
VIII.—List of the Colydiidee collected in the Amazons Valley by 
H. W. Bates, Esq., and Descriptions of new Species. By FRancts 
P. Pascor, F.L.S., &e. 
Tue number of species of Colydiide collected by Mr. Bates during his 
long residence in the Valley of the Amazons, and now in my collec- 
tion, amounts to thirty-nine*. For a family in which the species 
are generally small and inconspicuous, and whose lives are passed 
for the most part beneath the bark of trees, or in holes and galleries 
of the wood, and which therefore must be sought for with especial 
care and attention, this may be considered a large numbert. Even 
this number might doubtless have been exceeded if this able naturalist 
could have devoted more time to the investigation, but it is enough to 
show that multitudes remain to be revealed when other districts shall 
have been worked with the same care. 
It would be premature at this time to enter into any analysis of 
the distribution of the genera and species which this collection might 
have suggested ; as yet, we are scarcely on the threshold of our know- 
ledge of the family. For the present I shall follow the division of 
the Colydiide into the five subfamilies proposed by Erichson, pre- 
mising that one of them, the Pycnomerine, although represented at 
Rio, is absent from this collection. 
The following table shows the most salient of the diagnostic cha- 
racters of the genera mentioned in this list. 
SYNCHITIN.[, 
Tarsi with the basal joint short. 
Body peltiform, antenne 12-jointed.............. Zancelea, n. g. 
Body oblong, antennz 11-jointed. 
Without antennary grooves ............-2000. Bitoma, Herbst. 
With antennary grooves. 
Prothorax lobed anteriorly ................ Distaphyla, Pase. 
Prothorax not lobed anteriorly .............. Phieodalis, Ev. 
Tarsi with the basal joint elongate ........ ....... Acropis, Burm. 
* For some of these, however, I am indebted to W. Wilson Saunders, Esq., 
who, with rare generosity, has permitted me to take possession of many speci- 
mens, often unique, in this and the allied groups, which were wanting in my 
collection. 
+ Before Mr. Wollaston commenced his researches at Madeira and the Canaries, 
the total number of described species was not above sixty. 
