290 Mr. H. W. Bates’s Notes on Longicorn Coleoptera. 
Biitschli has no reason for doubting that the former supposition 
is the only correct one. Among a great number of these 
animals I have not seen a single one in which there were not 
always the two kinds of spicules, and always arranged in the 
same manner—that is to say, the longer ones implanted only 
by one end at the surface of the head, and the smaller ones 
entirely immersed in the organic substance of the head and 
peduncle ; further I have never observed any other spicules, 
small grains of sand, or other foreign substances. I believe, 
therefore, that we may, without hesitation, accept my opinion 
that these spicules are the product of the organism itself, as, 
indeed, we not untfrequently find siliceous spicules formed by 
the protoplasm of the Heliozoa. 
As regards the classification of the animal, there is only a 
single point that makes me hesitate before placing it among 
the Heliozoa ; and that is the absence of pseudopodia. I have 
never been able to observe pseudopodia issuing from any part 
of the body, just as I have also never seen them in Haliphy- 
sema ramulosa; and M. Paul Mayer has also told me that he 
never saw them in Wagnerella. With the exception of this 
difference there is a very great resemblance between Wagnerella 
and the Heliozoa, such as Clathrulina, for example—a resem- 
blance much closer than with any Rhizopod or, in general, 
any other Protozoa. It must consequently form a distinct 
family in the group of the Heliozoa—a family which will be 
characterized by the presence of separate spicules forming the 
skeleton, and by the presence of a peduncle which attaches the 
animal to foreign objects. This family should undoubtedly be 
called WAGNERELLIDA, from the generic name of the single 
species known. 
XXIX.—Notes on Longicorn Coleoptera.—Revision of the 
Arénicides and Amphionychides of TYropical America. 
By H. W. Bates, F.R.8., F.L.S. 
[Continued from p. 204. ] 
Isomerida jimbriata. 
I. albicolli major et robustior, elytris postice paullo dilatato-expla- 
natis. Niger, griseo subtiliter pubescens, thorace lateribus obtuse 
tumidis vittaque angusta indistincta grisea; elytris apice rotun- 
datis et planatis, carina laterali paullo ante apicem desinente, dorso 
subcrebre punctulatis, lateribus vitta alba (spatium inter carinam 
et marginem occupante) longe ante apicem terminata; antennis 
( d ) corpore longioribus nigris, articulis secundo ad sextum infra 
sparsim ciliatis, ceteris pubescentibus; corpore subtus nigro, 
