Pteronotus davyi: Another peculiarity of bats is found in two species which have the wings attaching at the middle of the back ather than on the flanks. Naturally they are called bareback bats. You can stick your finger up under the wing and find that the body is furry right up to the middle of the back where the wings attach.

Cynomops greenhalli: Bats have standard fingers, tibiae, and feet, but there are variations. This particular bat is a free-tailed bat with its tail protruding beyond the edge of the interfemoral membrane. Some bats are totally tailless, and some have no interfemoral membrane at all.

In my modern systematics, I discovered one species of bat on the basis of its batfly, or rather, I discovered the full extent of its distributional range on the basis or its batfly. Where I discovered the bat in Northern Venezuela, it was strikingly larger than the other large Artibeus that occurred there. I named it on the basis of that northern Venezuelan population. Then my entomologist friend told me I should look again at my Amazonian Artibeus because the same batfly that he had described from the new bat in northern Venezuela was also on bats in Amazonia. So I looked and there among the big Artibeus were some of the new species not differing in size from its congeners as it did in the North. I had just overlooked it, because where I named it, its relatives were much smaller. They varied in size geographically, small in the north, larger in the south, but the new bat did not.

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