INSECUTOR INSCITI^ MENSTRUUS 81 



Pronotum obscure yellow. Mesonotal praescutum yellow 

 with three broad, shiny black stripes that are nearly confluent, 

 the lateral stripes continued caudad onto the scutal lobes ; 

 scutellum yellow ; postnotum black, sparsely gray pubescent. 

 Pleura dark, with a fine gray pubescence ; dorso-pleural mem- 

 branes obscure yellow, Halteres yellowish brown. Legs with 

 the coxae and trochanters yellow, whitish pubescent; femora 

 brownish yellow, the tips broadly dark brown ; anterior face 

 of femora slightly darker than posterior face; tibise brownish 

 yellow, the tips dark brown ; tarsi dark brown. Wings with a 

 strong yellowish tinge, the costal cell more saturated; wing- 

 markings very restricted, appearing as narrow brown seams 

 along the cord, at the tip of R^ and at the forks of i^^+j and 

 M; macrotrichise on wing-surface lacking in the bases of the 

 principal cells. Venation : Rs comparatively short, straight ; 

 r-m connected with Rs shortly before its fork. 



Abdominal tergites obscure orange-yellow, with a broad 

 median black stripe that is narrowly interrupted at the pos- 

 terior margins of the segments ; hypopygium blackish ; sternites 

 orange-yellow, sternites 6 and 7 black with the posterior mar- 

 gins broadly yellow. Male hypopygium with the region of the 

 ninth tergite profoundly notched, with a small, oval hairy lobe 

 at the base of the notch, the ends of the tergal lobes pale, 

 deeply bifid. Caudal margin of the eighth stemite produced 

 into a short, broad truncated median lobe, immediately dorsad 

 of which lie two small lobes that are densely covered with 

 long, erect, silvery setae. 



Habitat. — Japan. 



Holotype, male, Teshio, Northern Hokkaido, July 14, 1916 

 (T. Isshiki). Shiraki No. 6988. 



The general appearance and size of the present species is 

 somewhat as in P. albiniana (Fabr.) of Europe. 



Ptychoptera subscutellaris, new species. 



Related to P. scutellaris Meigen (Europe), differing in the 

 structure of the male hypopygium. 



Male. — Length about 9 mm. ; wing, 9.2 mm. 



