1972] 
Crozier & Taschenberg — Janus 
1 17 
| )|t$l|i4 #•«*»**• •*•••»» 
t|9lilii a *««»*• * %&#*«§• M 
Figure 1. Karyotypes of 22, 24 and 26 chromosomes of Janus integer. 
HAPLOID NUMBER 
Figure 2. Genus-karyotypes of Symphyta, based on published data (San- 
derson, 1971; Nogusa, 1965; Waterhouse and Sanderson, 1958; Comrie, 
1938; Maxwell, 1958; Mackay, 1955). Benson’s (1950) review does not 
give sources for the counts given, and Sanderson’s (1932) counts were later 
shown by her (Sanderson, 1971) to be in error; counts from before these 
two and pre-1932 sources have therefore been omitted. 
