244 ENTOMOLOGICAL SOCIETY 
Pelioptera ? gigantula. This is entirely unknown to me. 
Homocusa expansa. Lasius claviger (Ulke). 
Oxypoda sp. " Formica rufa" (LeConte). Unknown to me. 
Myrmecochara pictipennts. Solenopsis geminata (Schwarz). * 
Myrmecochara f n. sp. Solenopsis debilis (Schwarz). 
Myrmecochara ? n. sp. A species undoubtedly congeneric with the pre- 
ceding, and collected by the late Mr. H. K. Morrison at Lake Tahoe, Cal. 
No specimens of the ant were received. 
Euryusa obtusa. Formica integra (Schwarz); F. exsectoides (Per- 
gande). 
Euryusa n. sp. Lasius bicornis (Patton). A single specimen, col- 
lected at Waterbury, Conn., was given me by Mr. W. H. Patton. The 
label bears the following inscription : "The beetle on the ground, not near 
nest; the ant was playing with it; the beetle turned up its abdomen, and 
the ant opened its mandibles." 
Megastilicus formicarius. Formica exsectoides (Blanchard). 
Platymedon laticollis. Formica obscuripes (Schwarz) ; occurs in Ari- 
zona, Colorado, and Nebraska. 
Oxytelus n. sp. Formica obscuripes (Schwarz); occurs in Colorado and 
Nebraska. 
Oxytelus placusinus. Formica fusca, Lasius alienus (Schwarz); occa- 
sionally met with under decaying leaves, and not in company of ants. 
Limulodes paradoxus. Lasius aphidicola (Schwarz). 
Brachyacantha ursina. The larva is abundant near Washington^ D. C., 
in the colonies of Lasius claviger, preying upon the Pemphigus domes- 
ticated by the ants (see J. B. Smith : "Ants' nests and their inhabitants," 
Amer. Nat., v. 20, 1886, p. 680). Whether or not this is the normal habit 
of the larva must be left to future observations. 
EmpJiylus americanus. A specimen of the ant among which I found 
this in Colorado is in the LeConte collection at Cambridge, and, judging 
from memory, it belongs to Lasius. 
Hypocoprus formicetorum. Formica obscuripes (Schwarz). 
Hister planipes, Camponotus pennsylvanicus f (Hamilton); Formica 
exsectoides (Blanchard). 
Hister perpunctattis. Formica Schaufussi (Blanchard). 
Hister repletus. Lasius niger (Blanchard). I agree with Dr. Hamilton 
that H. subopacus is probably also myrmecophilous. 
Hetcerius brunnipennis. Formica fusca (Hubbard) ; F. exsectoides 
(Blanchard). 
Hetcerius Blanchardi. Aphcenogaster ftilva (Blanchard). The western 
species of Hetcerius are unquestionably strictly myrmecophilous, but I 
have not been able to obtain specimens of the ants. 
Echinodes setiger. The various species of ants, among which this is re- 
ported from South Carolina and Georgia, cannot be determined in the ab- 
sence of specimens. E. decipiens is no doubt also myrmecophilous, and 
probably also the genus Ulkeus. 
