Amongst the specimens of true flies collected in the Philippines were specimens with some strange characteristics. For instance, there are representatives of two families with wingless forms. There is one species with bulbous structures on the top of the head with ocelli on the top of the bulbs.
Diopsidae (stalk-eyed flies)
Perhaps the strangest family of true flies are the Diopsidae, which have eyes situated at the end of long stalks. This is a rather small family with only two species in the New World. Most of the diversity is in the Old World tropics. During the course of this expedition three different species were encountered: one species with relatively short stalks and raptorial forelegs; one species with much longer eye stalks; and one species with long eye stalks and a spine on each stalk, about halfway to the tip.