HOMCOTIC REGENERATION OF THE ANTENNZ IN A 
PHASMID OR WALKING-STICK.1 
By H. O. Scumir-Jensen, Copenhagen, Denmark. 
[With 2 plates. ] 
REVIEW OF PREVIOUS RECORDS OF HOMCOSIS IN INSECTS. 
The term ‘“‘Homeosis” (the assumption by one of a series of 
parts of the characters proper to another member of the series), was 
first used in biology in 1894 by W. Bateson(1),? who in his studies — 
of variation applied it to several cases of meristic, or segmental, 
variation, in which one member of a meristic series assumes the form 
or peculiarities characteristic of other members in the same series. 
In a special chapter of his work, Bateson summarizes all the cases 
of homeosis in Arthropoda of which he could find records. The 
four insect records given in this work are here referred to at some 
length for chronological reasons. 
(A) In 1876 G. Kraatz(2) described and feud a specimen of 
Cimbex axillaris where peripheral parts of left antenna were devel- 
oped into a tarsal joint with two well-developed normal claws, sepa- 
rated by a well-developed plantula. The antenna was otherwise 
normal, as far as where the club-shaped terminal joint should nor- 
mally have been, although as a whole it was slightly smaller and 
thinner than the normal right antenna. Bateson, who had examined 
this specimen, had nothing to add to the description by Kraatz. 
(B) In 1889 Kriechbaumer(3) secured a male specimen of Bombus 
variabilis Schmkn., in Munich, which had the left antenna partially 
developed as a tarsus. The first two joints of the antenna were 
normal, the rest were abnormal. From the apex of the second 
abnormal joint arose a shortened, reddish brown, shiny joint bearing 
two quite normal claws similar to those on the tarsi. 
Bateson further records the following two cases, but remarks that 
the first must be regarded as doubtful until a more detailed descrip- 
tion is made, and that the second may not be a case of homeosis 
at all. 
Carausius (Dixippus) morosus.’”? Videnskabelige Meddelelser fra Dansk naturhistorisk Forening i Kjgben- 
havn. Vol. 65, pp. 113-134. Copenhagen, 1913. 
2 Numerical references are to bibliography at end of the paper. 
023 
