56 Psyche [June 
approximated, there is usually a sternal fulerum of the coxa 
(Crampton and Hasey, |. ¢.), and other characters showing that 
they have much in common. 
I would group the Psocidee, Thysanoptera, Mallophaga, Ano- 
plura (Pediculidz), Hemiptera and Homoptera in another su- 
perorder, the Panhomoptera, but by so doing, I would not minimize 
the close relationship of the Psocids to the Neuroptera, and the 
close approach of the Hemipteroid lines of development to those 
of the Mecoptera and Diptera. The Hymenoptera are closely 
allied to both the Psocidze and the Neuroptera, and I have been 
unable as yet to determine in which of the two superorders they 
should be placed. 
In connection with the discussion of the interrelationships of 
the orders of insects, it may be of some interest to note that it 
would appear that in the interesting little Crustacean Bathynella 
we have a form very like the common ancestors of the Insecta 
and “Myriopoda”’ (sensu lato). Bathynella belongs to a very 
ancient group of Crustacea, and the number of segments com- 
posing its body, the character of its appendages (which are lack- 
ing on the last segments), etc., are all in accord with the view that 
it is very like the ancestors of the Proturan insects. Bathynella 
is also very like the probable ancestors of the Symphyla-Pauro- 
poda, a group which has departed but little from the condition 
characteristic of the ancestors of the ““ Myropoda”’ as a whole. 
BIBLIOGRAPHY. 
The following articles treat only of the Neuroptera and Mecop- 
tera. Bibliographies of works on Trichoptera, Diptera, etc., will 
be given in articles dealing with the genitalia of these groups. 
1914. Campion. Revision of the Mexican and C. Amer. 
Chauliognathide, Based on the Genital Armature of the 
Males. Trans. Ent. Soc., London, 1914, p. 128-. 
1918. Crampton. Phylogenetic Study of Genitalia of Males of 
Lower Insects. Bull. Boooklyn Ent. Soe. 
Essen Prererson. Monograph of the Mecoptera. Coll. 
Zo6l., Baron Selys-Longchamps. 
1895. Fert. Scorpion-flies. 10th Rpt. N. Y. State Entomolo- 
gist, p. 463-. 
