OF WASHINGTON. 245 
Amphotis Ulkei. Cremastogasterlineolata (Ulke, Schwarz) ; Formica 
Schaufussi (Pergande) ; F. Integra (Schwarz). Mr. Ulke mentions as host 
also F. rufa, but this must be referred to F. integra or Schaufussi. My 
experience with this beetle is that in early spring it is strictly myrme- 
cophilous, but in the fall of the year it is found in decaying fungi. The 
second species of this genus, A. Schivarzi, will no doubt also prove to be 
myrmecophilous, but it has hitherto been found only washed up on the 
beach at Fortress Monroe, Va. 
Monotoma fulvipes. Occurred in great numbers in the hills of Formica 
obscuripes in Colorado (Schwarz), but has been found in the Eastern 
States not in company of ants. 
Enparia castanea. Solenopsis geminata (Riley, Schwarz). 
Euphoria inda.K Cetoniid larva, undoubtedly referable to this species, 
is quite common near Washington, D. C., in midsummer in the smaller 
hills of Formica integra. The imago I never met with among ants, but 
Mr. L. Brunei- writes that he found it in the hills of .P. obscuripes. 
Euphoria kirtipes. Mr. L. Bruner kindly informs me that he never 
found the larva, but only the imago, near West Point, Neb. The beetles 
occur quite abundantly in the hills in the centre as well as around the 
edges of Formica obscuripes, as many as two dozen having been found in 
a single ants' nest. It was found under the same conditions by Mr. G. M. 
Dodge at Glencoe, Neb., and has, to my knowledge, never been observed 
remote from ants' nests. Mr. Bruner also states that he has occasionally 
found in the hills of the same ant specimens of another Euryomia of the 
size of E. melancholica, of which, however, no specimens have been pre- 
served. It is, perhaps, E. pilosicoliis, which, from its great hairiness, 
may be supposed to be myrmecophilous. 
Crcmastochilus.-T\\z\-e is nothing to indicate that the unity in habit is 
interrupted in this genus. The larvae have not yet been discovered, but 
live, no doubt, at the bottom of ants' nests. That the ants derive a cer- 
tain benefit from the beetles and try to prevent the escape of the latter 
from their nests, has already been observed by Prof. Hentz (see Scudder's 
" Entomol. Corresp. of T. W. Harris," p. 7). I mention here only those 
species of which I am able to give the name of the host. 
Crcmastochilus variolosus. Aph&nogaster fulva (Schwarz). 
Cremastochilus squamulosus. Camponotus esuriens (Hubbard). 
Cremastochilus castanece. Formica integra (Schwarz) ; .F. Schaufussi 
(Pergande). 
Crcmastochihis canaliculatus. Camponotus pennsylvanicus (Hamilton). 
An undetermined species occurs among Formica obscuripes in Nebraska 
(Bruner). 
Coscinoptera dominicana. Larva abundantly in a large anthill in Wis- 
consin (Riley); Camponotus melleus (Pergande). 
Coscinoptera f sp. Larval cases in great abundance in the hills of For- 
mica obscuripes in Nebraska (Bruner). The imago has not been bred. A 
third larva belonging to the Clythrini was found in ants' nests in Arizona 
