1985] 
Thayer — Mieralymma 
51 
Fig. 1. Distribution of M. nwrinum in North America. Circles represent records 
given in text; triangle represents a record mapped by l.indroth (1957), exact locality 
unknown. 
mentioned finding with M. marinum abundant “Podurelles” (prob- 
ably Anurida maritima (Guerin)), less abundant mites, and annelids 
and “petits coquillages.” It is not clear whether the last refers to 
mussels, periwinkles, barnacles, amphipods, or something else. 
West (1930) said that M. marinum are . .considered probably to 
prey on Thysanura,” but Lindroth (1931) regarded this claim (with- 
out giving any reference for it) as very unlikely because Thysanura 
are not known to occur at the Iceland M. marinum localities. Steel 
(1958, 1970) stated without giving reasons that “their main food 
appears to be the Collembolan Anurida maritima (Guerin)” (Podu- 
ridae or Hypogastruridae). In my collecting 1 saw very few of these 
Collembola, some small mites, many barnacles, and many small and 
