82 INSECUTOR INSCITI^ MENSTRUUS 



Rostrum dark ; palpi obscure yellow, darker toward the tip. 

 Antennae with the first segment dark brown ; second segment 

 dark brown with the apical half obscure yellow ; flagellum 

 black. Head black. 



Mesonotum shiny blue-black, only the median lobe of the 

 scutellum obscure yellow. Pleura dark, gray pruinose ; dorso- 

 pleural membrane pale yellowish brown. Halteres yellow, the 

 knobs yellowish brown. Legs with the coxae and trochanters 

 obscure yellow ; femora and tibiae yellow, the tips narrowly 

 dark brown ; tarsi broken. Wings with a grayish yellow 

 tinge, the costal and subcostal cells clearer yellow ; very small 

 and indistinct brown clouds at r; along the cord and outer 

 end of cell ist M^ ; veins brown. Venation : Rs spurred at the 

 angle. 



Abdomen blue-black, the caudal margins of the tergites very 

 narrowly pale. Male hypopygium differing from that of 

 P. scutellaris in the following points : Ninth pleurite with the 

 appendage elongate, near midlength with a conspicuous trian- 

 gular blade borne on a moderately long pedicel ; apex of the 

 appendage beyond this lateral lobe dilated into a long, clavate 

 lobe that is provided with abundant, long, dense hairs ; base 

 of the appendage triangular, heavily blackened, bearing several 

 stiff setae, the inner face projecting into a spine with a group 

 of about nine subequal, powerful, black spinules at its base. 

 In P. scutellaris, the appendage is slender with a small, nearly 

 sessile, feebly triangular lobe close to the tip ; base of the 

 appendage not conspicuously blackened, with a powerful spine 

 bearing about two or three smaller spinules along the margin ; 

 two or three similar spinules are scattered over the base of the 

 appendage. 



Habitat. — Japan. 



Holotype, male. Sapporo, Hokkaido, August 28, 1909 (T. 

 Shiraki). Shiraki No. 6978. 



This species was described by Matsumura (Thous. Ins. 

 Japan, Add. 2, pp. 473, 474, 1916) as Ptychoptera scutellaris, 

 supposed new species. The name is already in use for one of 

 the common European species of the genus. The writer 



