VOLUME 55, NUMBER 1 
5 
but the Anisotoma species have been taken more frequently in moist spec¬ 
imens which were transforming from the plasmodial phase. The lathridiids 
and sphindids were found throughout the powdery spore-bearing tissue of 
aethalia which varied in size from 3 cm to 10-15 cm diameter. The Fuligo 
specimens lacked evident entrance holes, which suggests that most of the 
beetles had developed in situ. Two lathridiid larvae were found with E. 
cordatus in 1 sample of Fuligo, and larvae and pupae of O. clcivicornis were 
dissected from another Fuligo specimen. No insects other than the beetles 
mentioned were observed in any samples of F. septica. 
Stemonitis spp. have also yielded both adults and larvae of Enicmus. 
Twenty-two adult E. tenuicornis LeC. were collected from a 3 cm wide 
patch of Stemonitis axifera (Bull.) under loose bark of a Lithocarpus log in 
Amador County, California. Several larvae were found with the adult E. 
tenuicornis and two were reared to the adult stage. Many E. cordatus were 
taken from a Stemonitis (species indet.) under oak bark in Benton County, 
Oregon. 
A large collection of Arcyria denudata (L.) found on the Oregon coast in 
November, yielded adults of Agathidium pulchrum LeC. and Agathidium 
rotundulum Mann., as well as Agathidium larvae on and among the spo¬ 
rangia. Two Agathidium rotundulum adults were reared from larvae in this 
collection. A second collection of Arcyria denudata from near San Bernar¬ 
dino, California contained three adult Agathadium pulchrum. 
Of the 12 beetle species listed above, only Agathidium pulchrum is known 
to be a general fungivore; I have found adults and larvae of this species in 
Oregon on the “oyster mushroom,” Pleurotus ostreatus group, and on a 
jelly fungus, Tremella mesenterica (S. F. Gray) Pers., both of which are 
Basidiomycetes. I have also seen a specimen of Agathidium pulchrum la¬ 
belled “on slime mold plasmodium” from King County, Washington (D.V. 
McCorkle, collector). Enicmus cordatus has been recorded from Neotoma 
nest, under bark, and in willow duff (Hatch, 1962), but it is my view (sup¬ 
ported by F. G. Andrews, personal communication) that Mycetozoa are the 
usual breeding substrate for this species and perhaps for all Enicmus species 
in western North America. Odontosphindus clcivicornis has been collected 
from the slime mold Stemonitis sp. in British Columbia (Hatch, 1962), and 
Andrews (1977) also records it from Arcyria versicolor Phill. and F. septica 
in California; no useful host records are available for the other beetle species 
above. Agathidium rotundulum and Agathidium brevisternum are relatively 
abundant in Berlese extracts from forest litter and may also be general 
fungivores; since Anisotoma spp. and the sphindids are rarely encountered 
except in flight (including light-trap collections), their occurrence in myce- 
tozoans as reported here is likely to be obligatory. All the beetles listed here 
are related to beetles in Europe which are indicated as slime mold specialists 
(Benick, 1952). 
