1983] 
Burnham — Geraridae 
33 
parts of all six legs present. The hind femora are not enlarged and 
demonstrate unequivocally their cursorial nature. 
IP 6. Reverse half. This specimen is not particularly well pre- 
served due to apparent post-burial distortion of the insect. The 
pro- and mesothoracic legs on the left side are detached from the 
body, and the antennae, although present, are detached from the 
head. Fore and hind wings on the left side overlap, but the venation 
of the fore wing is preserved, and nothing of the hind wing. The 
prothorax is largely intact and shows the spine bases. 
IP 4. Reverse half. The fore and hind wings on the left side are 
separated, and the venation of the left fore wing is clear. Unfortu- 
nately, little can be seen of the remaining three wings. 
IP 2. Obverse half. A single well-preserved hind wing. Anal area is 
missing but may be folded under the wing. This wing differs from 
most other gerarid hind wings because the first branch of RS con- 
nects to the main stem of RS by a strengthened cross vein, forming a 
small triangle in the center of the wing (see fig. 17c). 
IP 3. Reverse half. This is a partially preserved insect and shows 
most of the right hind wing but only a fraction of the other three 
wings. It is interesting, however, for one feature: the right hind wing 
shows an anastomosis of the first branch of RS with the main stem 
of RS as seen in IP 2. Because the anastomosis in this specimen is 
smaller than in IP 2, and present in only one of the hind wings, it 
may be assumed that it is a form of intraspecific variation, and not 
significant at a higher level. 
IP 9. Obverse half. Although the venation is virtually obscured, 
this specimen is important because the insect has been compressed 
laterally and all six legs are spread apart. The fore legs are only 
partially preserved, but the meso- and metathoracic legs on both 
sides are magnificent. This is the only specimen from Commentry in 
which one can count tarsal segments. There are five tarsomeres, and 
a pair of tarsal claws. The prothorax and its spine bases are also 
present in the fossil. 
IP 10. Reverse half. This is a single hind wing and well preserved 
except at the apex and in the anal area, which is folded over. 
IP 1 1. Reverse half. The specimen is a single hind wing, and so 
poorly preserved that the specimen is almost useless. 
