1924 ] 
Sex of Adult Cecido7nyid {Oligarces sp.) 
153 
In the descendants of members of a colony taken from 
nature there were found to be two types of paedogenetic larvae 
in respect to the sex of pupae and adults which they produced, 
(1) male-producing, and (2) female-producing. 
These two types of paedogenetic larvae are not morpholo- 
gically distinguishable. 
The evidence indicates that the distinction is genetic, since 
it holds not only in the case of a given individual, but also, 
without observed exception, in its offspring through five genera- 
tions of paedogenetic reproduction in two of which certain 
numbers of adult forms were produced. 
Thus the potentiality for producing only males or only 
females seems to be inherited; there existing in the colony 
male-producing and female-producing strains. 
Literature. 
Banta, A. M. and Brown L. A., 1923. Further control of sex in 
a species of Cladocera. Anat. Rec. Vol. 24, Abs. 144 p. 420, 
Edwards, F. W. 1919. Some Parthenogenetic Chironomidae. 
Ann. Mag. Nat. Hist. (9) 3; 222-228. 
Felt, E. P. 1911. Miastor americana. An account of pedo- 
genesis. New York State Mus. Bull. 147; 82-104. 
Goetghebuer, M. 1913. Un cas de parthenogenese observe 
chez un Dipt to TendipMide {Corynoneura celeripes). 
Bull, Acad. Roy. Belgique. 1913, 231-233. 
Grimm, O. 1870. Die ungeschlechtliche Fortpflanzung einer 
Chironomus-Art und deren Entwicklung aus dem unbe- 
fruchteten Ei. Mem. Acad. Imp. Sci. St. Petersbourg s4r. 
7, tome 15. 
Harris, R. G. 1923, 1. Sur la culture des larves de Cecidomyides 
paedogenetiques (Miastor) en milieu artificiel. Comptes 
Rendus Soc. de Biol. Paris, Tome 88 p. 255-7. 
Harris, R. G. 1923, 2. Occurence, Life-cycle, and Maintenance 
under Artificial Conditions of Miastor. Psyche Vol XXX. 
p. 95-101. 
