DIP TER A. 
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trees to attract moths. They feed on over-ripe fruit and 
other vegetable substances. 
The larvae are found in pools and in decaying vegetable 
matter; they have two pairs of spiracles, one at each end of 
the body. The pupae are free. 
Only four species of false crane-flies have been found in 
the United States ; these belong to the genus Rhyphus 
(Rhy'phus). 
Family ORPHNEPHILID^E (Orph-ne-phil'i-dae). 
The Solitary-midge. 
Only a single species of this family, Orphnephila testacea 
(Orph-neph'i-la tes-ta'ce-a), is known to occur it) North 
America. This is a small fly measuring about one eighth 
of an inch in length, with a wing-expanse of one third inch. 
The antennae are short, about as long as the head, and 
nearly of the same structure in both sexes ; the segments of 
the antennae except those at the base are slender and are 
clothed with a few short hairs. The ocelli are wanting. The 
compound eyes are large and meet in front in both sexes. 
The wing-veins are well developed on all parts of the wing ; 
vein II ends in the margin of the wing before the end of 
the basal third; vein III is two-branched, the first branch 
ending in the margin at the end of the second third of the 
wing and the other branch near the apex of the wing ; vein 
V is two-branched, the branches separating at the end of the 
basal third of the wing and near the cross-vein III-V ; the 
fork of vein VII and the cross-vein V—VII are near the end 
of the basal fourth of the wing. 
The transformations of this insect are unknown. 
Family BIBIONID.E (Bib-i-on'i-dae). 
The March-flies . 
In these flies the body is comparatively robust, and the 
legs shorter and stouter than in most of the families with 
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