28 
Protodice, which has already been described, according to Mr. 
Strecker, is found throughout the United States from the Atlantic 
to the Pacific and from the Gulf to British America. Vernalis, Edw., 
as shown by the observations of Mr. Bean, and as acknowledged by 
Mr. Edwards, is but a variety of this species. It is rather smaller 
than the typical form, and has the underside of the veins broadly 
bordered by greenish-gray or pale olive-brown. It appears early in 
the spring and late in the fall thus indicating that it is produced by 
the colder weather of these seasons. 
According to Mr. Scudder, Protodice is the American representative 
of the European Daplulice , the Alpine Callidice , the Siberian Leuco- 
dice , the South American Autodice , the Arabian Glauconome and the 
South African Nellica. 
Sisymbrii, Boisd., is found in California and appears to be confined 
to the Pacific Slope and is very closely allied to P. napi , Linn. It 
is possibly a variety of Oleracea. 
Napi, Linn., has been introduced by Mr. Strecker into the list of 
North American species, under which he has placed as varieties Olera¬ 
cea and several other species. Without attempting to discuss the pro¬ 
priety of this course, we prefer to follow the generally accepted opinion, 
omitting Napi from our list and considering Oleracea as a distinct 
species. 
Oleracea, Harr., is, as heretofore stated, a northern species extending 
south as far as the Middle States, even to Virginia, northward to 
Slave lake, in British America, and westward at least to Colorado and 
probably the Pacific slope. 
Frigida, Scudd, which is found in Labrador, is beyond any reason¬ 
able doubt a variety of this species. Pallida , as Strecker indicates, 
is in all probability another variety, which represents the species on 
the western coast. ’ lberidis, Boisd., Castoria, Reak., and Resedae, 
Boisd., are doubless, as Mr. Strecker considers them, synonyms of Pal¬ 
lida, all being found on the Pacific slope. 
Venosa, Scudd., appears to be the American representative of the 
European Napi, and Mr. Strecker has probably introduced the latter 
in our list because he considers Venosa as belonging to it. But it is 
perhaps best to follow Messrs. Scudder and Edwards in this case, and 
consider it as a distinct species although very doubtful. I would not 
be surprised if after all it should ultimately prove to be but a variety 
of Oleracea. Nasturtii, Boisd., appears to be another name of the same 
species; and Marginalis, Scudd., but a variety scarcely distinguishable 
by the description. 
Beckerii, Edw., which is found in Nevada and Utah, is considered 
by Mr. Edwards as a distinct species; but Mr. Strecker gives it in 
his catalogue as a synonym of the European, or rather, Northern 
Asiatic, Chloridice, Hub. Judging from the beautiful figures of it in 
Mr. Edwards’ work, I should say it was but a western variety of Proto- 
dice, produced by the climatic conditions of the section in which it is 
found. 
Occidentalis , Reak., which is considered by both Edwards and 
Strecker as a good species, is closely allied to Protodice and may ulti¬ 
mately be found to be only a western variety of that wide spread and 
somewhat variable species. It has been found only in Colorado and 
Nevada, and hence the name Occidentalis or Western. 
