128 THE CANADIAN ENTOMOLOGIST 



The pupa is robust, dark shelled, and active; the frons is in no way 

 produced, the thoracic region and wing-covers rugose, the remainder 

 shining except the interstices of the abdominal sutures which are 

 finely punctured. Two sharp spines occur at the cremaster, and 

 a subsidiary spine occasionally on the last segment laterad. 



Average length 23 mm.; diameter 7 mm. 



Emergence dates range from Sept. 25 to Oct. 15. 



Papaipema nephrasyntheta Dyar. 



The unique type of this species has remained in the United 

 States National Museum since its description in 1908 until recently, 

 without a counterpart. In conversation with its captor, Mr. E. A. 

 Schwarz, we learn it was taken at light on Plummer's Island, Md., 

 Sept. 27, 1904. 



-A second example from the same source and caught at the 

 same time, has recently been placed in the Museum collection 

 and this, though unspread, gives a better idea of the coloration 

 since it is brighter, whereas the type would seem as if it might be 

 somewhat faded. It was at first believed the Eryngium feeder was 

 this species, but a careful comparison forces an opposite conclusion. 

 The Dyar species is of a lighter, clay, ground colour, with the 

 central marking of the large white reniform a white lunulate line, 

 an unusual feature in the genus. Eryngium aqiiaticum does not 

 flourish at the type locality, and we incline, with its author, to 

 consider it a close ally of marginidens, with the larva yet unknown. 

 Both the specimens at Washington are females, hence the value of 

 genitalic comparisons are not available. 



Explanation of Plate VIII. 

 (Figures Natural Size.) 



1 Papaipema polymnicE, male. 



2 Papaipema polymnice, female. 



3 Papaipema polymnicE, larva, stage IV. 



4 Papaipema polymnice, larva, stage V. 



5 Papaipema polymnia, larva, mature. 



6 Papaipema eryngii, male. 



7 Papaipema eryngii, female. 



8 Papaipema eryngii, larva, stage IV. 



9 Papaipema eryngii, larva, stage VI. 



