34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 93 



dish brown f rontalia at least one-third width of front ; frontal row of 

 seven to nine bristles in male, six to eight in female, plus two reclinate 

 upper frontals, often three in male, extending down below level of 

 insertion of arista; in European males it has been noted there is a 

 tendency toward some strong bristles outside the frontal row (this 

 observation serves further to decrease the generic differences between 

 Phryxe and Madremyia) ; female with two proclinate fronto-orbital 

 bristles; both sexes with outer vertical bristle; facial ridge bristly on 

 lowest one-third to halfway ; gena one-fourth eye height ; frontal orbit 

 silvery gray, slightly more blackish toward vertex, face and paraf acial 

 silvery white, gena silvery gray ; antenna black, third segment in male 

 nearly four times and in female nearly three times as long as the second 

 segment ; arista thickened on at least basal half, penultimate segment 

 elongate, at least longer than broad ; palpus varying from pale or yel- 

 lowish brown to brownish black (the former are more apt to be those 

 specimens from Pieris rapae; the palpi of the European specimens are 

 uniformly darker than those of the American specimens). 



Thorax black; scutellum bluish-gray pollinose, black at base, broad 

 apex usually and tip always yellow, three long pairs of marginal scutel- 

 lars and a shorter erect or proclinate decussate apical pair, one pair of 

 discal scutellars; three sternopleural macrochaetae ; front tibia with 

 two bristles on median posterolateral side ; wing a little tinged, third 

 vein with two or three bristles at base; squamulae whitish. 



Abdomen fairly well covered with pollen; abdominal hairs erect 

 in male, some approaching macrochaetae in size in discal region, hairs 

 suberect in female; second segment with a pair of discal and marginal 

 macrochaetae ; third with a pair of discals and a marginal row ; fourth 

 segment tipped with bristles and long fine hairs instead of macro- 

 chaetae, discals seeming to be irregularly placed and sometimes to fol- 

 low roughly a row ; sides of abdomen in male and usually only second 

 abdominal segment in female with a somewhat variable red spot. 



Length 7-9 mm. On the average this species is slightly larger than 

 Phryxe pecosensis. 



Distribution. — Europe, extending to middle Sweden in the north; 

 Maine 7, New Hampshire 3, Massachusetts 25, Connecticut 1, Rhode 

 Island 3, New Jersey 1, Washington 1, British Columbia 1. In this 

 case it is difficult to assign much value to published records without an 

 examination of the material involved, or unless the host is mentioned. 

 New York may be included here, but it is considered that many of the 

 other published records involve material of Phryxe pecosensis. 



Hosts. — Pieris rapae (Linnaeus) 127, Porthe'ria dispar (Linnaeus) 



'vergestis straminalis (Hubner) 1. Only Pieris rapae of Schaff- 



ner and Griswold's list belongs here. The recorded and published 



European host list is a long and extensive one. Howard and Fiske 



