OF WASHINGTON. 247 
Formica obscuripes .... Homalota ? n. sp., Platymedon laticollis, 
Oxytelus n. sp., Hypocoprus formiceto- 
rum, Monotoma fulvipes, Euphoria inda, ' 
E. hirtipes, Coscinoptera sp. (larva), 
Anthicus n. sp. ? 
Formica Schaufussi .... Ptomaphagus parasitus, Homalota sp., His- 
ter perpunctatus, Cremastochilus casta- 
nese. 
Lasius niger Hister. repletus. 
Lasius alienus Scydrnaenus rasus, Adranes coecus, Batri- 
sus ionre, B. globosus, Homalota ? sp., 
Myrmedonia n. sp., Oxytelus placusinus. 
Lasius umbratus ? . . . . Adranes LeContei. 
Lasius aphidicola Ceophyllus monilis, Limulodes paradoxus. 
Lasius claviger Batrisus ferox, Homoeusa expansa, Brachy- 
acantha ursina (larva). 
Lasius interjectus Batrisus ferox. 
Lasius bicornis Euryusa n. sp. 
Prenolepis parvula .... Atinus monilicornis. 
Tapinoma sessile .... Unknown Aleocharid, Myrmedonia n. sp. 
Aphaenogaster tennesseensis . Tyrus humeralis, Batrisus juvencus. 
Aphaenogaster Treati . . . Decarthron stigmosum, Hymenorus ru- 
fipes (larva). 
Aphaenogaster fulva .... Decarthron stigmosum, Hetaerius Blan- 
chardi, Cremastochilus variolosus. 
Solenopsis geminata . . . Myrmecochara pictipennis, Euparia ' cas- 
tanea. 
Solenopsis debilis .... Myrmecochara ? n. sp. 
Cremastogaster lineolata . . Batrisus globosus, Myrmedonia n. sp., 
Amphotis Ulkei. 
Dr. Marx said that the myrmecophilous spider, Myrmekiaphila 
foliata, described by Prof. Atkinson, was omitted by Mr. 
vSchwarz. Mr. Ashmead stated that the genera of Hymenoptera 
mentioned by Mr. Schwarz were probably parasites of the Aph- 
ids or Dipterous larva? to be found in ants' nests, as these genera 
of Hymenoptera were well known to be parasitic on Aphids and 
Diptera. 
