2 NEW YORK STATE MUSEUM 
9 
Arthrocnodax occidentalis Felt 
1912. Felt, E. P. Econ. Ent. Jour., 5: 402 
1912 Quayle, H. J. Cal. Agr. Expt. Sta. Bul. 234, p. 514-15 
1913. ——————_ Econ. Ent. Jour., 6:87 
1914 Ewing, H.E. Ore. Agr. Expt. Sta. Bul. 121, p. 58 
1914 Felt, E. P. Econ. Ent. Jour., 7:458 
This midge was reared by Prof. H. J. Quayle from larvae preying 
on red spider, Tetranychus, Berkeley, Cal. It is considered one of 
the most important natural enemies of T. telarius on the 
Pacific coast. 
PRODIPLOsIS Felt 
1908 Felt, E.P. N. Y. State Mus. Bul. 124, p. 403 
1910 Rubsaamen, E.H. Zeitsch. Wissenschaft. Insektenbiol., 15:289 
1911 Felt, E.P. N. Y. Ent. Soc. Jour., 19:56 
1913 Kieffer, J. J. Gen. Insect., fasc. 152, p. 249 
This genus was erected for certain small forms which show 
an interesting transition between the typical binodose antennae 
of the male Itonid and the cylindric stemmed antennae of Rhop- 
alomyia. The circumfila are rudimentary or wanting. The third 
to ninth segments are distinctly binodose, the eighth and ninth only 
slightly so, while the tenth to the fourteenth are cylindric. The 
claws are simple. The third vein unites with the wing margin well 
beyond the apex. The genitalia are peculiar on account of the 
somewhat inflated harpes. Type Cecidomyia floricola 
Felt, C. a1681. 
Prodiplosis floricola Felt 
1907 Felt, E.P. New Species of Cecidomyiidae II, p. 21 (Cecidomyia) 
1908 ——-——— N.Y. State Mus. Bul. 124, p. 302, 403 
1918 ——————_ N.Y. State Mus. Bul. 200, p. 129, 133 
The pale yellowish male described below was reared August 15, 
1907 from somewhat enlarged, reddened flowers of the meadow 
sweet, Spiraea ‘salicitolia; taken at Albany Na. 
Apparently the same form was obtained from enlarged blossoms of 
Virgins bower, Clematis virginiana, taken at Karner, 
N. Y., August 15, 1907. 
Gall. The enlarged flower buds in spiraea are reddish. As the 
season advances, infested blossoms become conspicuous because of 
their failing to open. 
Male. Lengthi1mm. Antennae one-fourth longer than the body, 
sparsely haired, pale straw; fourteen segments, the fifth (fig. 7a) 
with stems one and two times their diameters respectively; basal 
enlargement subglobose, a subbasal whorl of rather long, curved 
setae, the distal enlargement broadly oval, a few scattering whorls 
