232 Mr. H. Campion on a 
species was originally described from the Lithographic Stone — 
of Bavaria. Another record from the Kimmeridgian which 
may, perhaps, be mentioned here is that of a very small 
nymph trom North-eastern Spain, described by Meunier 
under the name of Palweschna vidali (Mem. Acad. Barcelona, 
xi. no. 9, p. 122, pl. 1., 1914). 
Eleven species of the subfamily from the Tertiary of 
BHurope and North America were enumerated by Handlirsch 
in 1907 (‘Die Fossilen Insekten,’ pp. 900-901). . Four of 
them—schna larvata, Scudder, 4. dido, Hagen, 4. eudore, 
Heer, and 4schna sp., Curtis—were described from nymphs, 
and, even if their corresponding imagines should become 
known, the different stages could hardly be associated 
together with any degree of certainty. Moreover, the identi- 
fication of these nymphs may not be even approximately 
correct. Of the remains of adult specimens, one only—the 
subject of the present paper—is known from the Hocene. 
Both Anaz metis, Heer, from the Miocene of Radoboj, 
Croatia, and schna separata, Scudder, from the Miocene 
of Florissant, Colorado, have been referred by Needham 
to the Nearctic genus Oploneschna. These two species, 
as well as Litheschna needham?, Cockerell (Miocene of 
Florissant), differ from Trieschna gossi in respect that in 
them the vein Rs remains unbranched. As to Litheschna, 
in 1913 Professor Cockerell considered that it ‘is perhaps 
too close to Gompheschna” (Proc. U.S. Nat. Mus. xlv. 
p- 579, footnote). schna polydore and 4. tyche, both 
described by Heer from the Miocene of Oeningen, Baden, 
were considered by Scudder “to belong pretty certainly to 
/Eschna s. s.’”’ According to Heer’s figures (Neue Denkschr. 
Schweiz. Ges. xi. t. iv. figs. 6, 7, 1850 [1849]), both these 
fossils are greatly lacking in venational detail, and their exact 
genetic position must be regarded as doubtful. But, however 
this may be, they appear to differ from the Bournemouth 
fossil in several characters of importance. ‘Thus, in the 
Oeningen insects the branches of the media are more distinetly 
separated from each other at their origin, the trig. suppl. is 
not developed, and Rs bifurecates more distally, as well as 
asymmetrically. In addition, the 7rieschna wing is at least 
half as long again as the wings of Heer’s species. d&schna 
solida, Scudder, Miocene of Florissant, has been declared by 
Needham to be “the only fossil Adschna that seems to fit 
that name in the modern sense of it” (Proc. U.S. Nat. Mus. 
xxvi. p. 761, 1903). 
Since the appearance of Handlirsch’s list, Cockereli has 
