242 ENTOMOLOGICAL SOCIETY 
Ptomaphagus parasitus. Found among Camponotus pennsylvanicus? 
(Hamilton), Formica fusca (Hubbard), F. cxsectoides (Blanchard, Per- 
gande), F. Schaiifussi (Schwarz). 
Ptomaphagus n. sp. Formerly confounded with the preceding, it was 
first distinguished by Mr. Blanchard. Occurs with Camponotus pictus 
(Blanchard), Formica integra (Schwarz). 
Ptomaphagus brachyderus. Camponotus pictus (Blanchard). 
Scydmcenus rasus. Lasius aliemis (Hubbard and Schwarz). 
Adranes ccecus. Lasius aliemcs (Schwarz). 
Adranes LeContei. Lasius umbratus? (Hubbard). 
Fustiger Fiichsii. Unquestionably strictly myrmecophilous, but I could 
never obtain specimens of the ant with which it occurs. 
Atinus monilicornis. Prenolepis parvula (Ulke). 
Biotus formicarius. " In the nests of a small brown ant " (Casey). 
Ceophyllus month's. Lasius aphidicola (Hubbard). 
Cedius Z.iegleri. Formica exsectoides (Blanchard, Pergande), F. integra 
(Schwarz); ''F. rufa," mentioned by Dr. LeConte is probably = F. exsec- 
toides. 
Cedius spinosus. This is doubtfully referred here; sometimes found 
among ants (no specimens preserved), under bark, but often also not with 
ants. 
Tmesiphorus costalis. Found by Dr. LeConte with "Formica rufa." 
Tmestphorus carinatus. Doubtfully myrmecophilous, but it has been 
found with ants (no specimens preserved) under bark of old trees. 
Ctenistes pulvereus. Referred here on the authority of Dr. LeConte. 
None of the eastern species can be called myrmecophilous. 
Tyrus humeralis. Aphcenogaster tennesseensis (Schwarz), but occa- 
sionally found without the company of ants. 
Cercocerus batrisoides. In all probability to be included here, but no 
specimens of the ants have been preserved. 
Tychus pubertilus. Included on the authority of Dr. LeConte. The 
eastern species, so far as observed by myself, are not myrmecophilous. 
Decarthron stigmosum. Aphcenogaster fulva (Blanchard), A. Treati 
(Hubbard and Schwarz). This is, in my experience, the only strictly 
myrmecophilous species of the genus. 
Verticinotus cornutus. Referred here on the authority of Dr. Brendel. 
A second, still undescribed, species of this genus was found by myself in 
northern and central Florida under moss and not in the company of ants. 
Batrisus. My experience with this genus is that the species of the first 
group (hind tibiae without spur) are strictly myrmecophilous, while many 
species of the second group (hind tibiae with long terminal spur) appear to 
live quite independently from the company of ants. B. globicollis is cer- 
tainly not myrmecophilous, and the same may be said of B. spretus and 
allied eastern species which have been separated therefrom by Captain 
Casey. The determinations of some of the following species of this genus 
are possibly incorrect. 
