104 Bulletin of the Brooklyn Entomological Society Vol. XIV 
NEW NEARCTIC SPECIES OF THE GENUS ERIOPTERA 
MEIGEN (TIPULIDA, DIPTERA). 
By CHARLES P. ALEXANDER, Urbana, Ills. 
During the past few years, several new species of the genus 
Erioptera Meigen have come to hand. Some of these have been 
characterized in other papers, but a few still remain undescribed. 
Most of these belong to the group of E. chlorophylla O. S., a 
small assemblage of species whose limits of distribution are still 
not well understood. I am greatly indebted to Mr. Nathan Banks 
for data on the types of EF. chlorophylla, in the collection of the 
Museum of Comparative Zoology, and to Mr. Johnson and Mr. 
McAtee for specimens of the chlorophylla group. Unless stated 
otherwise the types of the new species are contained in the au- 
thor’s collection. 
Erioptera margarita new species. 
Male.—Length, 3.8-4 mm.; wing, 5.3-5.6 mm. 
Female—Length, 4 mm.; wing, 4.8 mm. 
Antenne with the basal segments light yellow, the flagellum brown; 
flagellar segments cylindrical, rather elongate, with coarse verticils. Head 
yellowish. 
Mesonotum reddish brown, the lateral margins and the humeral region 
yellow. Wings pale yellowish, the costal region more suffused; stigma 
indistinct, pale brown; veins brown. Venation almost as in E. microcellula 
Alex., cell first M: closed, very small; second anal vein straight, diverging 
from the first anal vein; basal deflection of Cu, immediately before the 
fork of M. 
Male hypopygium with the pleurites short and stout, the dorsal angle pro- 
duced caudad into a pale fleshy lobe that is sparsely provided with coarse 
sete. Pleural appendages two in number, the large one complex, bifid, 
the outer arm produced into a long, slightly curved, chitinized point whose 
surface is covered with very minute appressed teeth; the inner arm a 
broad, flattened chitinized blade with the apex truncated, in its angle at 
the base with a single conspicuous blackened conical point; the smaller 
pleural appendage is a slender arm whose acute chitinized apex is curved 
slightly caudad. The gonaphyses consist of six blackened chitinized hooks, 
‘a lateral pair that are very widely separated, the tips chitinized and cov- 
ered with microscopic teeth. The four intermediate hooks consist of a 
pair of median slender, acutely pointed rods that are smooth, almost 
straight, with the tips contiguous or slightly decussate. Besides the above 
