372 
Psyche 
[September-December 
Gelasopteron, new genus 
Fore wing: about ten times as long as wide; costal area only of 
moderate width basally; RS arising at about 1/6 wing length from 
base, continuing straight and parallel to R1 for its entire length; 
anterior branch of M weak, terminating obscurely near the wing 
apex; posterior branch of M terminating on CUA. 
Type-species: Gelasopteron gracile, n.sp. 
The generic name is derived from the classical Greek words 
ge/astos (ridiculous) and pteron (wing) and is considered neuter 
and singular. 
Gelasopteron gracile, n.sp. 
Figures 21-22 
Fore wing: length 28 mm (as preserved); width 2.8 mm; esti- 
mated complete length, 30 mm. Costal margin very straight up to 
the apical region; base of the costal area not preserved; R1 mostly 
straight, curving posteriorly at the apex, as it parallels the costal 
margin; M forking the level of the termination of SC, the anterior 
branch about twice as long as the posterior one. 
Holotype: no. 751 lab, M.C.Z.; collected at the Harvard quarry 
at Elmo in 1927. This specimen consists of a nearly complete wing 
and parts of others, as well as fragments of the thorax and abdo- 
men. As shown in the photograph (figure 21), one fore wing is 
stretched out at right angles to the body; a second wing of the same 
length, presumably the hind wing of the same side, partially over- 
laps the fore wing basally and is twisted and rotated so that its 
hind margin in contiguous with the hind margin of the fore wing. 
The distortion of the hind wing prevents a satisfactory study of its 
venation; the apical part appears to be like that of the fore wing. 
However the long CUA, the predominate feature of the fore wing, 
does not seem to be present in the hind wing, and there is a sug- 
gestion of an anal fan that has been folded up under the rest of 
the wing. 
The two wings on the opposite side of the thorax are flexed 
along the body, both of them folded and twisted together. The 
apical part (about 7 mm, labeled AP in figure 21) is bent at an 
acute angle to the rest of the wing, which is 20 mm long. 
Little is preserved of the body. A small portion can be seen 
posterior to the base of the wing; this is about 6 mm long and 2 
