24ft ENTOMOLOGICAL SOCIETY 
by Mr. Morrison, according to Prof. Riley (Amer. Nat., 1882, p. 598). 
The relationship of these Chrysomelid larvae to the ants has not yet been 
ascertained. 
Arceoschizus armatns. This is myrmecophilous, according to a com- 
munication from Mr. H. F. Wickham, but he did not preserve specimens 
of the ant. I do not know whether or not this is the normal habit of this 
species. Of another species of this genus, A. snlcicollis, Dr. Horn re- 
marks (Trans. Amer. Philos. Soc. , v. 14, p. 274) : "Under stones in very 
dry places, and very frequently, though probably merely accidentally, 
among ants." 
Alaudes singularis. " Specimens are very rare and found living with a 
small black ant under stones'' (Dr. Horn, 1. c., p. 362); also found among 
ants by Mr. H. F. Wickham. I have not the slightest doubt that this 
species is strictly myrmecophilous. No specimens of the ant are pre- 
served. 
Hymenorus rujipes. Larvae of this oceur commonly in the hills of 
Formica fusca at Washington, D. C. (Pergande, Schwarz), and in the 
nests of ApkcenOgaster Trcati (Pergande) ; the pupae of //. obscurut were 
found by Mr. Pergande among Formica fusca. I hardly believe that these 
or other species of Hytnenorns are strictly myrmecophilous in the larva 
state. 
Anthicus n. sp. ? A small yellow species, which I cannot refer to any 
described species, occurred abundantly in the hills of Formica obscuripes 
in Colorado (Schwarz). Every hill I examined contained many hundred 
specimens of the beetle. 
If this material, so far as rendered available by the determinations of the 
ants, is arranged according to the hosts, we obtain the following list : 
Camponotus pennsylvanicus. Ptomaphagus parasitus, Batrisus globosus, 
Lomechusa cava, Hister planipes, Cre- 
mastochilus canaliculatus. 
Camponotus laevigatus . . Lomechusa montana. 
Camponotus pictus .... Ptomaphagus n. sp., P. brachyderus, Lo- 
mechusa cava. 
Camponotus melleus . . . Coscinoptera dominicana (larva). 
Camponotus esuriens . . . Cremastochilus squamulosus. * 
Formica fusca Ptomaphagus parasitus, Oxytelus placusi- 
nus, Hetaerius brunnipennis, Hymeno- 
rus rufipes (larva), H. obscurus (larva). 
Formica integra Ptomaphagus n. sp., Cedius Ziegleri, Eu- 
ryusa obtusa, Amphotis Ulkei, Euphoria 
inda (larva), Cremastochilus castanea-. 
Formica exsectoides .... Ptomaphagus parasitus, Cedius Ziegleri, 
Homalota sp., Euryusa obtusa, Megasti- 
licus formicarius, Hister planipes. He- 
taerius brunnipennis. 
