310 
Psyche 
[December 
minded that it is not necessarily and exclusively parthenogenetic. 
The male may be described as follows: — 
Ameletus ludens Needham. 
Adult male: Length of body 8.5 mm.; tails 10.5 mm. addi- 
tional; fore wing 9 mm.; fore leg 12 mm. 
Head blackish, including the small lower division of the 
compound eyes. The large subspherical upper division of the 
eyes is honey yellow. Antennae black. 
The dorsum of the thorax is brown, with only small peri- 
pheral yellow markings around the humeri and on the metanotum. 
On the latter a pair of divergent pale marks is followed by a 
yellow U-mark in the rear upon the crest. In a side view the 
dorsum shines by reflected light with a golden metallic lustre. 
The thorax is black beneath except for narrow areas around the 
leg bases. The abdomen is brownish above, varied with paler 
on the middle segments at the ends. Beneath, the abdomen 
is whitish on the basal half. Middle and hind legs are brown; 
the fore legs, blackish, with one claw somewhat paler. Wings 
hyaline, with all venation black except at the extreme base. 
Tails blackish, becoming a little paler apically. Forceps black, 
tawny at the base, with extremely short basal segment, subequal 
terminal segments and the second segment much exceeding in 
length the other three taken together. 
This is the smallest known species of the genus. Its nearest 
allied species is Ameletus velox Dodds (Trans. Amer. Ent. Soc. 
49: 105, PL 8, fig. 17, 1923). The male genitalia differ from 
those of that species in the following points: the basal segment 
of the forceps is much shorter, being wider than long; the second 
segment is less cylindric, being constricted at its basal third and 
widened toward both ends; between the two triangular lobes of 
the plate beneath the penes there is a broadly rounded median 
notch; and the penes themselves are shorter and less incurved at 
the tips. 
The unique male specimen is in the Cornell University 
collection. 
