116 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
at the extreme tip; second branch of the media joins the median cross- 
vein. Hypopygium (pi. 16, figs. 14, 15) elongate, unarmed, and 
simple in structure. Abdomen long and slender resembling that of a 
dragonfly, hence the generic name. 
Aeshnasoma rivertonensis new species. 
PI. 16, fig. 13-15. 
(S' . — Head reddish, orbits light yellow, ]>alpi brown, antennae 
yellow, the flagellum brown. Thorax reddish brown with three 
narrow, dark brown lines ending at the suture; the subdorsal lines 
indistinct except near the suture; a small dark brown spot also jjresent 
at the base of the wing; scutellum, metanotum, and pleurae yellow. 
Abdomen reddish brown, long and slender. Halteres yellowish, 
knobs brown. Wings brown, vein slightly darker. Legs reddish, 
tip of the tibiae and tarsi brown; the relative length of the tibiae to 
the metatarsi varies from tibia 14, metatarsus 25 mm., to tibia 17, 
metatarsus 33 mm. Length of body, 35 mm.; wing, 18 mm. 
Riverton, New Jersey, July 20, 1902. Type in the author's collec- 
tion. 
DOLICHOPEZINA. 
This section of the Tipulidae is represented in the eastern United 
States by four genera: Dolichopeza, Oropeza, Brachypremna, and 
Megistocera. For some time I have been collecting material in this 
group to ascertain the true position of Say's Tipula annulata. Several 
species are rather common in certain localities, especially in damp 
shady places and particularly about overhanging rocks, where they 
cling to the under sides in great numbers. Their extremely delicate 
structure and peculiar, quick dancing flight, enable them to disappear 
very suddenly and efl^ectually when disturbed. They are also very 
diflScult to obtain in any degree of perfection, for their slender legs 
often fall off with the slightest touch. Among the one hundred and 
eleven specimens before me, were five true Dolichopeza. The re- 
mainder represent a closely related genus Oropeza, recently described 
by Professor James Ct. Needham. 
