88 
Psyche 
[March 
“radiating spot,” giving rise to 5 main branches, the first of them 
forked; M diverging immediately beyond the spot of radiation from 
CuA, and soon forking; MA simple; MP with 4 terminal branches; 
Cu dividing at the radiating spot into CuA and CuP; CuA simple, 
close and parallel to the proximal branch of MP and to CuP; CuP 
also simple, either close to or fused with 1 A posteriorly; anal veins 
sometimes formed, not curved distinctly backwards, not regular; 1 A 
with 2 principal branches, 2A with 4 principal branches. Reticula- 
tion not very dense, somewhat irregular; intercalated sectors short, 
irregular. Color pattern of irregular, dark, oblique stripes. Anal 
brace almost straight, crossing obliquely basal anal area from the 
posterior margin to the stem of R+M+Cu. 
Etymology. The generic name is derived from the type locali- 
ty, Carrizo Arroyo, New Mexico, and pteryx (Greek for wing). 
Discussion. Carrizopteryx is the oldest calvertiellid genus and 
the only one known from the Upper Carboniferous. Its venation 
is more primitive than that of Lower Permian Moraviptera, Mora- 
via, and Calvertiella in the following features: the anal veins do not 
differ from other less advanced Palaeodictyoptera; they are 
branched and lack the parallel regular arrangement and sickle-like 
curvature typical of the more advanced calvertiellids; the trans- 
verse, prominent, cuticular thickening of more specialized calver- 
tiellids is replaced only by a simple contact of the veins at one termi- 
nal spot, from which the veins R, M+CuA, and CuP radiate. The 
fork of MP is relatively narrow and oriented more obliquely to- 
Fig. 5. Carrizopteryx arroyo , n. sp., portion of the hind wing showing ribbon-like 
cubital stem and color pattern. Late Upper Carboniferous of New Mexico. Original. 
