178 INSECUTOR INSCITI^ MENSTRUUS 



Female. — Length, excluding rostrum, about 7.5 mm. ; wing, 

 9 mm. ; rostrum about 2.6 mm. 



Rostrum and palpi dark brown. Antennae dark brown 

 throughout. Head dark gray with a narrow, longitudinal, light 

 gray median line on vertex ; vertex between eyes silvery white. 



Mesonotal praescutum obscure yellow, the dorsum occupied 

 by three completely confluent brownish gray stripes, leaving the 

 humeral region and the lateral margins of the ground-color ; 

 scutum gray, the mesal margin of each lobe with a narrow 

 blackish longitudinal line ; scutellum light gray with a capillary 

 black median line ; postnotum brov/n, sparsely dusted with gray. 

 Ventral pleurites obscure reddish yellow, the dorsal pleurites 

 infuscated, pruinose. Halteres yellow, the knobs da'-k brown 

 on the distal half. Legs with the coxae and trochanters yellow ; 

 femora and tibiae obscure brownish yellow, the terminal tarsal 

 segments darkened. Wings with a faint brownish tinge, the base 

 and costal region yellow ; a conspicuous brown pattern, including 

 seven larger costal areas, the first in the bases of cells Sc and R; 

 the second with a pale center in cell R; third at origin of Rs, 

 extending from C almost to M ; stigmal spot large, connected 

 with a spot in the basal third of cell R^ ; terminal spots at ends 

 of veins ^2+3 and -^4+5 1 smaller spots in cell C ; a series of 

 spots and blotches along vein Cu in cell M and caudad of the 

 vein in cell Cu; cord and outer end of cell ist Mo seamed with 

 brown ; small brown spots at ends of anal veins, that on 2nd A 

 larger ; brown dots near base of cell isi A and, in cases, in 

 bases of cells R and 2nd A; veins brown, bright yellow in the 

 costal region except where they traverse dark areas. Venation : 

 Sc long, Sc^ ending opposite midlength of Rs, Scr. at tip of 

 Sc^ ; Rs angulated and spurred at origin ; cell ist M, elongate, 

 gently widened distally, longer than any of the veins beyond it; 

 basal deflection of Cu^ beyond the fork of M. 



Abdominal tergites brown, the sternites yellow. Mesal face 

 of pleurites of hypopygium produced into a long, very slender, 

 curved spine. 



Holotypc. male, Gifu, May L 1921 (K. Takeuchi). 



Allotopoiypc, female. 



