INSECUTOR INSCITI^. MENSTRUUS 135 



atrophy. This may be the species mentioned by Osten Sacken 

 (Bed. Ent. Zeitsch., vol. 31, pt. 2, p. 311, 1887) as having 

 rudimentary wings in both sexes. 



Gynoplistia sackeni, new species. 



Antenna of the male with 17 segments, the third to fifteenth 

 with very long, slender branches ; thoracic pleura light gray ; 

 wings subhyaline, the apex darkened ; a large, subquadrate 

 brown blotch at the origin of Rs; a conspicuous brown seam on 

 the cephalic half of the cord; cell ist M., long-rectangular; 

 male hypopygium light yellow with the outer pleural append- 

 age bifid, the short arms nearly equal and parallel. 



Male. — Length about 11 mm.; wing, 11 mm. 



Rostrum and palipi light brown. Antennae with the first 

 segment reddish brown ; flagellum dark brown ; antennae with 

 17 segments, the first to thirteenth flagellar segments with 

 long, flabellate branches, the longest exceeding in length the 

 basal four flagellar segments taken together ; terminal two 

 segments simple ; the pectinations are provided with long, erect 

 pubescence, each tipped with one or two bristle-like verticils ; 

 the pectination of the first flagellar segment is about three 

 times the length of the segment that bears it, that of the 

 thirteenth segment about as long as the segment that bears it. 

 Head dull gray ; a large blackish spot behind each antenna) 

 base ; occiput reddish. 



Mesonotum light gray, the praescutum with three reddish 

 brown stripes, the median stripe broadly divided by a gray 

 line ; remainder of the mesonotum brown, heavily gray pru^ 

 inose. Pleura reddish, heavily light gray pruinose. Halteres 

 light brownish yellow, the knobs darker brown. Legs with the 

 coxae light gray pruinose ; trochanters light yellow ; femora 

 brownish yellow, the tips indistinctly darkened ; remainder of 

 the legs light brown, the outer tarsal segments darker. Wings 

 subhyaline, the wing-tip darkened ; cells C and Sc light brown ; 

 stigma long-oval, dark brown ; conspicuous brown markings 

 arranged as follows: A blotch at the base of cell R; a large, 

 subquadrate area at the origin of Rs; a conspicuous seam ex- 

 tending from the stigma to cell ist M., ; basal deflection of 



