. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 MELANDER AND BRUES. [VOL. I. middle legs similarly ornamented if we except plumipes. For this reason and because it shows a tendency toward the length- ened face of Hygroceleuthus, we have included plumipes in the present paper. But as this species shows strong Dolichopus characters in the short, stout antennae and slight costal thick- ening, it cannot be placed satisfactorily in either genus as they have been defined. On the other hand, the European Hygroccleu- thus diadcma merges with DolicJiopus on ac- count of its sh
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 124 MELANDER AND BRUES. [VOL. I. middle legs similarly ornamented if we except plumipes. For this reason and because it shows a tendency toward the length- ened face of Hygroceleuthus, we have included plumipes in the present paper. But as this species shows strong Dolichopus characters in the short, stout antennae and slight costal thick- ening, it cannot be placed satisfactorily in either genus as they have been defined. On the other hand, the European Hygroccleu- thus diadcma merges with DolicJiopus on ac- count of its shortened antennae. The original defini- tion of Hygroceleuthus included a deep incision in the hind margin of the wing and broadened wings. From these characters Aldrichii%x\A. deviate. F,o. ,. -Showing length of face: ., Dolichopus contains, male; 2, Hygroceleuthus plumipes, male; 3, Hygroce- decidedly leuthus W'heelerii, male ; 4, Hygroceleuthus amnicola, female; 5, Hygroceleuthus afflictus, male; 6, Hygroce- l^CltlpCS, tne Ollly American groceleuthus which Loew saw, possessed no characters at vari- ance with the typical species. It was because of limited material that Loew felt justified in constructing this genus. Like other genera founded on secondary sexual characters alone, such as Rhagoneura and SpatJiochira of this same group, Hygroceleuthus has been found invalid as the number of species increased. From the foregoing it seems advisable that HygroceleutJius be no longer retained with generic value, but may be kept as an expression for a group of the genus DolicJiopus. Of the previously described species of HygroceleutJius, one has failed to be recognized, lamellicornis Thorn., if indeed this be a species of HygroceleutJius. The type was a female from California, but the description omitted the important Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these
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