312 NEW YORK STATE MUSEUM 
Key to genera 
a Antennal segments globose with a smooth stem distally and ornamented 
only with whorls of long hairs. The 3d vein is well separated from 
costa and unites with the margin at or beyond the apex............ 
Joanissia Kieff. 
aa Antennae variable, frequently with crenulate whorls and subapically with 
variously formed chitinous structures; the 3d vein uniting with the 
Maton DerOnes Ole Neabethiesap exact ety weeds Campylomyza Meig. 
JOANISSIA Kieft. 
This genus presents a very characteristic form and is easily sepa- 
rated from all other Cecidomyiids. The antennae in both sexes are 
composed of a number of segments, each consisting of a subglobu- 
Af 
INES GO JOA mMISSiea joliou ophila Felt, sth and roth antennal segments of male» 
much enlarged. (Original) 
lar basal enlargement ornamented only with irregular whorls of 
simple setae and a smooth, cylindric stem distally [fig. 30]. The 
male has 14 and the female 11 antennal segments. ‘The palpi are 
tri or quadriarticulate. The venation of the wing is very charac- 
teristic, as the third vein is well separated from costa, runs nearly 
parallel thereto and unites with the margin at or well beyond the 
apex; the fourth vein is simple. 
Nothing is known concerning the life history of our native forms, 
though Kieffer has recorded the rearing of several European 
species from decaying wood, from tufts of moss and also from a 
mold covering a fungus. It is very probable that *our American 
forms live under similar conditions, particularly as they seem most 
abundant in the vicinity of forests or other conditions where decay- 
ing vegetable matter is present in some abundance. 
