OF WASHINGTON. 165 
codendron infested by P. consimilis. Here I succeeded also in finding its 
larva within the galleries of the Scolytid. From the Liquidambar twigs 
I obtained further a small number of the rare Narthecius grandicpps, and 
from the vines of RJius toxicodendron a few specimens of Lcemophlcetis an- 
gustulus, which species was also bred some years since by Mr. H. G. Hub- 
bard from twigs of Rhus glabra infested by P. consimilis. The three 
Cucujids just mentioned have a rather cylindrical form of body, and I am 
inclined to believe that their larvae will only be found within the galleries 
of bark-boring Scolytids, whereas most of the species of Lcemophlccus 
with flattened body, e. g., L. testaceus, biguttatus, etc., are. not enemies of 
Scolytids, but probably prey upon dipterous and other coleopterous larvae 
living under loosened bark. A single specimen of Scalidia Uncarts, found 
dead in the galleries of P. conccntralis in southeastern Florida, might in- 
dicate that the larva of this species is preying on those of Scolytid. The 
larva of Nemosoma cylindricum was frequently found in the galleries of 
P. consimilis, and is a very efficient enemy of this, and no doubt also of 
other Scolytids infesting deciduous trees. No Histeridce were found in the 
galleries of the three Pityophthorus mentioned above, though our species of 
Cylistix, and the more cylindrical species of Platysoma and their larvae, 
are common enough in the galleries of pine-infesting Scolytids. Our 
species of Hypophlaeus seem also to prey only on Scolytids infesting 
Conifers. Some genera of Cleridce, both in the imago and larval states, 
are well known as enemies of Scolytidae ; the pretty Clerus ichnetimoneus 
could frequently be seen on the trunks of Rhus metopium watching for the 
Pityophthorus and snapping them off as soon as they emerged from their 
holes, and a large Clerid larva found in the galleries probably belongs to 
that species. From the twigs infested by P. annectens and consimilis I 
bred numerous specimens of Phyllobcenus dislocatus, but did not observe 
the larva. 
An accidental, but nevertheless very efficient, enemy of P. annec- 
tens proved to be a Cerambycid larva, viz., that of Leptostylus acu- 
lifer, which was quite common in the Liquidambar branches. The bur- 
rows of this Leptostylus are very broad when compared with the diameter 
of the larva, and are preferably constructed right through the colonies of 
the Scolytids, completely obliterating their galleries and crushing the 
Scolytid larvae and pupae. I have since observed that the larvae of allied 
Cerambycids (Leptostylus macula and Hyperplatys asj!>ersus),which I found 
in Hickory twigs inhabited by Thysanoes fimbricornis, have also the habit 
of running their galleries over those of the $colytid, for the reason, I sup- 
pose, that on such places the bark has become somewhat loosened from 
the wood, thus facilitating the burrowing on the part of the Cerambycid 
larva. 
Dr. Marx gave an account of a " List of the families Therid- 
iidae, Thomisidae, and Agalenida?, found in the District of Co- 
lumbia." 
