OF WASHINGTON. 243 
Batrisus ionce. Lasius alienus (Schwarz). The ant mentioned by Dr. 
LeConte as the host is probably the same species. 
Batrisus juvencus. Aphcznogaster tennesseensis (Schwarz). 
Batri&is ferox. Lasius claviger (Schwarz), L. intcrjectus (Pergande). 
Batrisus cristatus. The " large rufous ant with a brownish head " men- 
tioned by Dr. LeConte, appears to be a species of Aphcenogaster. 
Batrisus riparius. Camponotus pennsylvanicus ? (LeConte) ; found by 
Mr. Hubbard at Crescent City, Fla., in an old Cynipid gall inhabited by a 
colony of ants (no specimens preserved) ; Dr. LeConte found it in Georgia 
under pine bark apparently not in company of ants. 
Batrisus globosus. Camponotus pennsylvanicus (Schwarz) ; Lasius alie- 
nus, Cremastogaster lineolata (Hubbard and Schwarz). It is, however, 
frequently to be found under decaying leaves, etc., not in company of ants. 
Batrisus bistriatus. "With a large rufous ant " (LeConte); "with a 
medium-sized, honey-yellow ant" (Hamilton). This last-mentioned ant 
appears to be a Lasius. 
Batrisus lineaticollis. "With a large rufous ant" (LeConte). 
Batrisus simplex. The two typical specimens were collected by Hub- 
bard and Schwarz under bark of old stumps in company of ants (speci- 
mens not preserved). 
Trimium puncticolle. Included on the authority of Dr. Horn. 
Homalota Several species have been found among ants, but since no 
comparison of specimens has been made, the number of species remains 
uncertain. 
Homalota sp. With " Formica rufa " at Bedford, Pa. (LeConte). 
Homalota sp. Very abundant with Formica exsectoides (Blanchard). 
Homalota sp. An insignificant looking species with Formica Schau- 
fussi (Hubbard and Schwarz). 
Homalota f sp. With Lasius alienus (Hubbard and Schwarz). 
Homalota ? sp. Remarkable from the broadly impressed thorax in the 
male; occurs in the hills of Formica obscuripes in Colorado and Nebraska 
(Schwarz). 
Unknown Aleocharid. Resembling in general appearance the genus 
Ecitopora; occurs with Tapinoma sessile at Washington, D. C. (Schwarz). 
Lomechusa cava. Camponotus pennsylvanicus (LeConte); "Formica 
rufa" (LeConte); Camponotus pennsylvanicus, C. picttis (Pergande, Hub- 
bard, and Schwarz). 
Myrmedonia. Of the six North American species which are known to 
me, and which appear to be referable to this genus, only two have been 
found among ants. M. rudis, found many years ago by Mr. Ulke resting 
on fences at sunset, has the appearance of being a myrmecophilous species, 
but has not been found again in recentyears ; M. Sallei Sharp, occurs*com- 
monly in southern California and throughout the southern States, but 
does not appear to live among ants. 
Myrmedonia n. sp. Cremastogaster lineolata (Pergande, Schwarz). 
Myrmedonia n. sp. Tapinoma sessile (Blanchard); Lasius alienus 
(Hubbard and Schwarz). 
