1895.] L. de Niceville & Dr. L. Martin —Butterflies of Sumatra. 
367 
species to the Indian Museum, Calcutta, which was captured on the 
19th April, 1889, by Mr. C. White, the chief officer on board the Penin-, 
sular and Oriental S. S. “Ravenna ” in the Straits of Malacca (which is 
at the point where the butterfly was caught only a few miles broad), not ; 
far off the island of Pnlo Jara between Penang and Singapore. It is there¬ 
fore not at all improbable that the butterfly flew off from either the 
adjacent island of Sumatra or from the Asiatic mainland. I have for 
some years past been looking forward to its capture in India proper, 
and I think it cannot be long hence before we have evidence of its hav¬ 
ing established itself on this continent. 
P.S '—Since the above was in type, I have lighted on an article in 
“ The Entomologist’s Record and Journal of Variation,” vol. v, p. 1 
(1894,), by Dr. F. J. Buekell, entitled “ Danais archippus, Anosia 
plexippus, or What,” in which he discusses the question of the correct 
name by which “ The Wanderer ” should be known, and arrives at the 
following conclusions :— 
“ 1.—The balance of argument is against the claim that the Ameri¬ 
can insect is the plexippus of Linnaeus. 
2. —The earliest name given to that species was erippus , Cramer, 
and, if the ‘ law of priority ’ is to be pedantically adhered to, this is the 
trivial name that must be adopted. 
3. —The Fabrician name, archippus , is that by which the species 
has been most widely known, and as changes in accustomed nomencla¬ 
ture are to be deprecated, and as, moreover, erippus , Cramer, is a 
varietal form found in Brazil, archippus should be retained as the trival 
name of the species, and erippus used as the name of the variety.” 
As will be seen above, I am unable to follow Dr. Buekell in 
his conclusions, priority of nomenclature must in all cases be strictly 
maintained. 
9. Danais ( Limnas ) chrysippus, Linnaeus. 
Snellen. Hagen. Moore. Found only in the alluvial plain, all the 
year round, but always very local, and restricted to spots where its food- 
plant, species of Calotropis and Asclepias , are found in abundance. There, 
under a concatination of favourable circumstances, an immense increase 
of the species, and thousands of specimens, appear. When an over 
population of this nature occurs, all the food-plants are entirely 
eaten up by the caterpillars, food gets scarce, and the few butterflies 
which reach maturity are very small. It takes a long' time to recover, 
and not a single specimen may be seen for a year. 
Aberration alcippus , Cramer ( = alcippoides , Moore). Hagen as var. 
alcippoides. Semper as alcippus from a small island near Sumatra 
