I'lEKIS I. 



as in male, except that a round black spot appears in snbmedian intersj^ace on 

 jjrimaries. 



Taken by Mr. Henry Edwards, at Virginia City, Nevada, April 1870, on 

 flowers of Brassica. Four individuals were taken, and these were the only ones 

 seen. This fine species is allied to Protodice and Occidetitalis, but is abundantly 

 distinct. 



At the request of Mr. Edwards I have named it in honor (using his own lan- 

 guage) " of one of my earliest and most valued entomological friends. Dr. Ludwig 

 Becker, who laid down his noble life in the cause of science in Australia. He was 

 attached as naturalist and draughtsman to the great expedition of Burke and 

 Wills across the continent from Melbourne to the Gidf of Carpentaria, and died 

 of fatigue and privation at Cooper's Creek, New South Wales, in 1861. The 

 friend of Humboldt, Milne Edwards and Owen, he jwssessed a most observant and 

 philosophical mind and his papers upon various subjects connected with his favor- 

 ite science testify to his vast and varied erudition. I have always promised myself 

 that I would commemorate our friendship by attaching his name to some sjiecies 

 I might discover, and the present is very appropriate as a few moments before I 

 took my first specimen of this Pieris I was thinking very much of Becker and of 

 the many hapf)y collecting days we had passed in the forests of Australia." 



