24 AMBLTPTILUS. 



north of Oregon ; and bred it from larvae found 

 feeding on Orthocarpus in June of the same year in the 

 neighbourhood of Rouge River in Southern Oregon, 

 which I had expected to produce Platyptilus ortho- 

 carpi above described. The species must be at least 

 double-brooded, and it varies considerably in size and 

 in the intensity of its markings. I had at first some 

 doubts whether my numerous specimens might not 

 be separated into at least two species ; but a careful 

 examination and comparison of these with a series 

 of the European form, as well as the perfectly 

 regular and gentle gradations of size and colour by 

 which they are distinguished, tend to prove that 

 they all belong to the same. 



Prof. Zeller, in his abstract of Wallengren's ' Scan- 

 dinaviens Fjadermott,' published in the Stettiner ent. 

 Zeitung, 1867, treats of cosmodactylus as identical 

 with ulodactylus, Zett., and acanthodactylus, Hiibn. ; 

 and I am indebted to him for specimens of what 

 he understands by the first and last of these three 

 names. The two forms which he has so kindly sent 

 me are certainly included in my American series, of 

 which three varieties are figured here to facilitate 

 identification. 



The expanse varies from 18 to 23 millims. 



I am not acquainted with Fterophorm lohidac- 



