ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
621 
are to a large extent bridged over, and that Scolopendrella must conse- 
quently be regarded as the living form that comes nearest to the hypo- 
thetical ancestor of the two great divisions of Tracheates. 
Mr. Pocock proposes to divide the group into two sections, one to 
contain the Pauropoda and Diplopoda, the other the Chilopoda, 
Symphyla, and Hexapoda ; the former may be called Progoneata, the 
latter Opisthogoneata. If the affinities between the Symphyla and 
Chilopoda are greater than those between the Symphyla and the 
Hexapoda, a group Homopoda may be formed to contain those two orders 
of Myriopoda. 
Phylogenetically the classification is represented thus : — • 
Diplopoda Pauropoda 
v / 
K. 
Progoneata 
Chilopoda Hexapoda 
Symphyla 
/ 
s -/ 
Opisthogoneata 
Tracheata 
a. Insecta. 
Life-history of Cochliopodidse.* — Prof. A. S. Packard gives accounts 
of the life-histories of some members of this family of Moths. He finds 
that the young, like the fully formed, larvae have no traces of abdominal 
legs. The shape of some of the young is such as to suggest that either 
the Cochliopodidae have originated from the Saturniidae or forms allied 
to them, or that both these families have descended from a common 
stem-form, which was, perhaps, Notodontian. The tuberculated larvaa of 
Euclea, Adoneta, and Empretia are those that are most like the larvae of 
other Bombyces. 
Some of them, probably from adaptation to a series of causes unlike 
those which affect any other caterpillars, might easily be mistaken for 
a fold or bend in a leaf. Others, such as the larvae of Heterogenea, are 
wonderfully similar to the red dipterous or aphidid galls on oak and 
other leaves. 
It is now of importance to determine how late in embryonic life the 
abdominal legs disappear. 
The forms of which the author gives more or less full life-histories 
are Empretia stimulea, Euclea querceti , Parasa chloris, Adoneta spinuloides, 
Phobethron sp., Limacodes scapha, Pachardia elegans , Lithacodia fasciola , 
and Heterogenea spp. 
Nutritive Relations of Lepidoptera.f — Dr. Ad. Seitz discusses 
thirty-three points of interest concerning the nutritive relations of 
Lepidoptera. The arc of possible oscillation is often very wide, much 
wider than in most other insects; abnormal diet, scarcity, periodic 
* Proc. Amer. Phil. Soc., xxxi. (1893) pp. 83-108 (4 pis.), 
t Zool. Jahrb. (Abtli. Syst., &c.), vii. (1893) pp. 131-86. 
