. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 504 Bulletin Museum of Comparative Zoology, Vol. 144, No. 8 premaxiUary opercle. subopercle angiilar quadrate dentary coronomeckelian articular symplectic interopercle preopercle Figure 16. Landonia latidens. Internal view of jaws, suspensorium, and facial bones ( specimen). festae, many of which were taken in standee! condition. Many specimens of Bnjconamericus have guts full of mud. Several Landonia had empty guts. A mm iMmlonia liad a well-formed bolus of segmented fin rays, perhaps from a chara- cid,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 504 Bulletin Museum of Comparative Zoology, Vol. 144, No. 8 premaxiUary opercle. subopercle angiilar quadrate dentary coronomeckelian articular symplectic interopercle preopercle Figure 16. Landonia latidens. Internal view of jaws, suspensorium, and facial bones ( specimen). festae, many of which were taken in standee! condition. Many specimens of Bnjconamericus have guts full of mud. Several Landonia had empty guts. A mm iMmlonia liad a well-formed bolus of segmented fin rays, perhaps from a chara- cid, and nothing else. The stomach of a specimen contained a packet of about 24 characid scales from to mm in their longest dimension, including some scales which app(>ar identical to scales on a 53-mm Astyanax festae from the same collection. Its own scales are mm in their longest dimension. A specimen contained a few scales and a few sti-ands of what looked like a filamentous alga. None of the Landonia examined had ingested insects or sand and soil particles. In contrast to Landonia, Phenacohrycon feed largely on an assortment of Arthrop- oda. A list of the artliropod stomach con- tents of ten Phenacohrycon from the Rio Vinces (MCZ 48660) was kindly prepared b\' Dr. John Lawrence: Aianeida 2 Acarina 1 Collembola 20+ Orthoptera Tridact>'lidae 2 Hemiptera Gerridae 14+ Diptera 3 kinds of larvae 7+ Hymenoptera 1 Coleoptera Staphylinidae 1 Limnichidae 1 The waterstriders, almost certainly taken alive at the surface, and the springtails, possibly taken at the surface, are the predominant food items. The water- striders constitute the item with greatest biomass among die stomach contents. The Tridact}'lidae are minute mole crickets \\hich tend to live in damp soil at or near the water's edge. The staphylinid beetle, mite (a terrestrial form), hymenopteran, and perhaps the spiders are likely to have been taken while floating or sinking after fallin
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