132 
Psyche 
June-August 
place in the same way as with the Ephemeroptera, a new proof 
that the Endoblastic insects may be placed opposite to the 
Ectoblastic in classification. 
Conclusion. 
The scheme of primordial wing neuration worked out by 
Comstock is useful only for Ectoblastic insects, which have lost 
the posterior branch of the median nervure, and that since 
their appearance in the coal measures. 
The Endoblastic forms, Subulicornia and Rhynchota have, for 
the most part, in the coal measures, a complete neuration conform- 
ing to a scheme in which six low nervures alternate with six high 
nervures ; those between in which the wings do not agree with this 
type, notably all the forms which have persisted beyond the Per- 
mian, have lost other longitudinal nervures than the Ectoblasts. 
The Ephemeroptera, the Protodonata, the Odonata, and 
the Hemiptera do not possess the anterior branch of the cubital 
nervure; the Ephemeroptera and Hemiptera lack also the 
anterior branch of the median nervure; the Protodonata, as 
well as the Odonata, have retained this, but the Odonata have 
lost the posterior branch of the median nervure. 
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2. Comstock, J. H. The Wings of Insects. Ithaca. (1918). 
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