56 
Psyche 
[March 
two chromosomal types (by rearing offspring from isolated females) 
for further study. 
Pycnoscelus Surinam ensis. - — Although Matthey (1945, 1948) 
found that parthenogenetic P. surinamensis has the same number of 
chromosomes as the bisexual species, it is evident that the number 
of chromosomes in this complex is highly variable. The modal diploid 
numbers of chromosomes for the various clones of P. surinamensis 
(Table 3) are 34 (Brazil, Fig. 9; Australia, Fig. 5; Thailand, 
Fig. 8), 35 (Thailand, Fig. 10) 37 (Indonesia, Fig. 11), 53 (U.S., 
Fig. 13; Brazil, Fig. 15), and 54 (Panama, Fig. 16; Jamaica, 
Fig. 17). 
Of 650 cells examined from one specimen from Bogor, Indonesia 
(normally with 37 chromosomes), 38 cells had 74 chromosomes, and 
Table 2. Chromosome numbers of Pycnoscelus indicus females a . 
Source** 
Nymph 
Number 
Cells 
Examined 
Number of cells with 
the following chromosome counts: 
31 33 34 
35 
36 
37 
38 
Hawaii 0 
2 
20 
20 
4 
20 
17 
3 
5 
20 
20 
8 
20 
1 
2 
15 
2 
Indonesia** 
16° 
20 
20 
22* 
20 
3 
11 
4 
2 
Indonesia^ 
18* 
20 
1 
1 
1 
17 
Hawaii 0 
1 
20 
20 
3 
20 
2 
1 
17 
6 
20 
20 
7 
20 
20 
9 
20 
1 
3 
16 
10 
20 
2 
2 
1 
15 
13 
20 
1 
2 
17 
Indonesia d 
11 
20 
20 
12 
13 
13 
14 
20 
20 
15 e 
20 
20 
17 e 
15 
1 1 
2 
1 
10 
20* 
20 
3 
4 
13 
21* 
20 
4 
4 
12 
a The chromosomes in a maximum of 20 cells per individual were counted. 
If this number could not be found, as many cells as possible were examined. 
b The original source from which laboratory colonies were started. 
c From ia culture of Hawaiian $ $ X Hawaiian $ $. 
d From a culture of Bogor $ $ X Hawaiian $ $. 
e Nymphs reddish. 
*Nymphs black. 
