INSECUTOR INSCITI^ MENSTRUUS 43 



asaleella Brants (Tidsch. voor Entomologie, vol. 56, p. Ixxii, 

 1913). 



Thus we have a definite record of how this frail little moth 

 has come from Asia and within a few years has successfully 

 established itself in Europe in such numbers that it repeatedly 

 has been reshipped to this country and has at least temporarily 

 survived also here. The record is of the more value because 

 the species may possibly also reach this country direct from 

 Japan, and if it should establish itself, might eventually readily 

 have been considered an American indigenous species, as it is 

 closely allied to an American group of the genus. 



A POLISTIFORM GENUS OF MUSCOID FLIES 



(Diptera) 

 By CHARLES H. T. TOWNSEND 



Polistiopsis, new genus. 



Genotype, Polistiopsis mima Townsend, new species 

 Belongs in the Penthosia group/ and strikingly counterfeits 

 in both form and color the common reddish-brown forms of 

 Polistes. Differs from Penthosia chiefly as follows : Second 

 antennal joint of male decidedly more elongate, the third joint 

 being less than three times as long as the second ; proboscis be- 

 yond geniculation as long as lower border of head, corneous ; pal- 

 pi absent. Abdomen of male consisting of six segments visible 

 from above, polistiform, the first segment short and narrowed, 

 second segment elongate and narrowed on basal half, third 

 segment about as long as second and widening gradually from 

 the posterior width of latter, fourth segment about same length 

 and gradually narrowing from posterior width of third to about 

 the width of second segment on middle, fifth segment much 

 shorter and narrowing rapidly, sixth and last segment rather 

 pointed and about as long as its basal width ; genitalia not 

 prominent. A lateral marginal macroch^ta on first and third 

 segments, several on second segment including a lateral discal, 

 and a pair of lateral marginal on fourth segment; a median 



