126 



NEW YORK STATE MUSEUM 



from which it may be easily separated by differences in the color of 

 the legs and in the emargination of the ventral plate. 



METADIPLOSIS Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 406 



1910 Rubsaamen, E. H. Zeitsch. Wissenschaft. Insektenbiol., 15:285 



191 1 Felt, E. P. N. Y. Ent. Soc. Jour., 19:59 

 1913 Kieffer, J. J. Gen. Insect., fasc. 152, p. 21 1 



The genus is easily distinguished from the ordinary type of Itonid 

 by the unique genitalia, the basal clasp segment being short, stout, 

 broadly rounded and with conspicuous triangular, chitinous pro- 

 cesses at the internal angles, while the terminal clasp segment is 

 short, greatly constricted near the middle, enormously swollen and 

 recurved apically. Type and sole species, Metadiplosis 

 s p i n o s a Felt. 



Metadiplosis spinosa Felt 



1908 Felt, E. P. N. Y. State Mus. Bui. 124, p. 406 



The unique male characterized below was taken July 14, 1906 on 

 quack grass, Agropyron repens,at Albany, N. Y. 



Male. Length i mm. Antennae one-fourth longer than the body, 

 thickly haired, dark brown, the basal segments reddiish; fourteen 



Fig. 21 Metadiplosis spinosa: a, fifth antennal segment of male, setae not 

 sketched in; b, palpus of male (enlarged, original) 



segments, the fifth (fig. 21a) with stems three and three and one-half 

 times their diameters respectively. Palpi (fig. 2 ib) ; the first segment 

 short, stout, subrectangular, the second twice the length of the 

 first, stout, the third a little longer and more slender than the second 



