22 Mr. J. W. Tutt on recent Haperiments in 
Il. Hybrids between f T. crepuscularia ab. delamerensis 
(York) and 2? 7. bistortata (Clevedon).—No. 2 above. Two 
batches of eggs; hatched April 18th-19th. The two 
broods were fed up together, the imagines being a mixture 
of both broods. 61 imagines examined, emerged between 
June 12th, 1897, and September 19th, 1897. They may 
be grouped as follows :— 
22% —® These are very close to ordinary second 
brood 7. bistortata, but have the ground- 
colour rather more suffused than is usual in 
that form. 
5 These are very like small 7. crepuscularia, 
the tint and markings are almost identical 
with the Yorkshire specimens of this species. 
At These have the size and markings of the 
last set, but are ochreous, and tend in this 
respect to come nearer JT. bistortata ab. 
abvetaria. 
Ce Of the same fuscous suffused form as those 
described in the last crossing as resembling 
the Perthshire 7’. bistortata. 
We Larger and almost indistinguishable from 
the first brood of 7. bistortata, the forewings 
rather less ample towards apex. 
26 2 These are of the ab. delamerensis, although 
some are more uniformly grey than the pure 
bred examples of this aberration. The dark 
transverse markings are very ill-defined, but 
the pale subterminal line is perhaps a shade 
more well-developed than in the specimens of 
last crossing. The single female of this brood 
is small, ill-developed, and has crippled wings. 
60 oe? Complete brood ; no pups going over. 
The two crosses just summarised represent the recipro- 
cal crosses of typical Tephrosia bistortata and T. crepus- 
cularia ab. delamerensis. The following points are worthy 
of notice. J.—Percentage of a form approaching ab. dela- 
merensis in the two crossings: (1) 7. bistortata $ x T. 
ab. delamerensis 2 = 60 per cent. (2) 7. ab. delamerensis 
& x T. bistortata 2 = 40 per cent. I[L—Percentage of 
females: (1) in Ist crossing = 52 per cent.; (2) In 2nd 
