. Botany and semen 283 
6th. Difference of food is accompanied by a ma arked difference in the 
chemical properties of gall-producing secretions, the external characters 
of the @ a — remaining identical.— Cynips q. spongifica O. 8. and 
C. q. inanis O 
th. entnclia of food is — nd a slight, but constant 
change in the coloration of the abdomen of the ¢ 9 imago, and bya 
very slight change in the chemical pecieities of the gall-producing secre- 
tions, the galls of the two insects, though typically somewhat distinct, 
being connected by intermediate grades in the case of the latter.—Cyn- 
- 2. punctata Bassett and €. g. Podagra Walsh. 
8th. Difference of food is accompanied by one marked and perfectly 
constant colorational difference, and others which are a perfectly con- 
stant, in the larva, but none whatever in the ¢ Q imago.—Halesidota 
tessellaris Sm. Abb. and Z. Antiphola Walsh. 
9th. Difference of food is accompanied by several slight but constant 
ceva differences in the g imago, but none whatever in the 9 im- 
a Robinie Forst. and Cl. pictus Drury. 
ifference of food is Ba ey by a slight but constant 
Sette difference in both g an mago.—l. Tingis Tilie n. sp. and 
- amorphe n.sp. 2. (Doubtful.) Samoan femorata Say and D. 
elit n. 
11th. (Doubt tful.) Difference of food is accompanied by very strong 
structural and colorational differences in the larva and in all probability 
by a constant structural difference of generic value in the 9 imago, the 
og imagos being to all external appearances identical, and the two insects 
. belonging to different genera,— Sphingicampa distigma g Q Walsh and 
ryocampa bicolor g Harris. 
12th. Difference of food is accompanied by marked and constant dif- 
ferences, either colorational, or s structural, or both, in the larva, pupa 
and imago states.— Halesidota tessellaris Sm. Abb. and H. Carye Harris, 
and hundreds of species belonging to the same genus and commonly 
considered as distinct species. 
The constitution of the human mind is —_ that the same evidence 
carries with it very different degrees of weight, when presented to differ- 
ent intellects. Others will no do es draw ve iferent conclusions from the 
facts catalogued above; but for my own part, as.on the most careful con- 
sideration lam unable to draw any definite Tine i in the above series, and 
to that here end eat arieties and here es the 
ey egree.” 
Comparative Zoology at 
ide; by TuEo- 
