10 Bolton, " Mark Slirru[) " Collectlov of Fossil Insects. 



A portion of the cubital area on the wing margin is de- 

 stroyed, so that the whok: course of the cubitus vein is not 

 shown. Parts of the anterior branch of the cubitus are present, 

 and its general course can be determined. The inner branch 

 oi the cubitus was probably forked, and but two fragments 

 are left. No anal veins are shown. 



The surface of the wing seems to have been slightly coria- 

 ceous, whilst the intercalary venation is beautifully preserved 

 ox'cr the whole structure. 



The mtercalary venation consists of a fine reticulated 

 mcshwork, enclosing small polygonal cc^lls, which assume a 

 somewhat linear arrangement in the intercostal, sub-costal, and 

 radius areas. A casual glance gives the impression of cross 

 \ eining passing obliquely between the sub-costa and the costal 

 margin. The mnior differences existing in the sub-divisions 

 of the rachal sector are not, in my opinion, of specific im- 

 jiortancc, and I regard the specimen as a beautiful example of 

 Brongniart's species. 



Affuiitics. — A com[)arison of Microdictya liauiyi. with 

 other forms shows that a close relationship exists between it 

 and Sagenoptera fonnosa, Goldenberg. The latter species 

 was first described by Goldenberg (PaL'eontogr. IV., p. 30, taf. 

 5, fig. 2, 1854), nnder the generic name of Ternies {Enter- 

 iiiopsis). and afterwards removed by him to the Dictyoneura 

 (Goldenberg, Fauna saraep, foss. 11, p. 50, 1877), whilst in 

 1885, it was removed to Goldenhergia by Scudder. {Froc. 

 Avier. Acad., Vol. XX., jx 172, 1885). Still later (1906, Die 

 Fossilen Insekten, p. yi, taf. IX., hg. ig), Handlirsch removed 

 the species to a new genus Sagcnoptera. 



An examination of the figure of Sagenoplcra foniiosa shows 

 that the character of the sub-costa, radius, radial sector, and 

 cubitus veins are almost identical with those of M. hamyi. The 

 sub-costa runs out on the costal margin at the same point, the 

 radius is a simple vein dividing in the first third of the wing ; 

 the radial sector has few (five) divisions, ending on the wing 

 tip, and the distal portion of the inner wing margin, and the 

 cubitus has a long, undivided outer twig. Specific differences 

 are jiresent, but generically, we sec nothing to se]-)arate the 

 two genera. Neither Sagcnoptera fonnosa, nor Microdictya 

 liauiyi, arc far removed from the genus Dictyoneura. 1 hey 

 differ in possessing a closer and more highly develo]>ccl inter- 

 calary venation, the cubitus is simple and less divided, and 

 the anal area is larger, with more oblique veins. 



From the foregoing, it seems clear that Scudder's genus 

 name of (loldcnhcr gia must be retained, and that the later 

 generic names of Heeria, Microdictya and Sagenoptera be 

 dropi)ed, and that Sagenoptera fonnosa must be transferred to 

 the genus Cioldenber gi'i. 



Brongniart's "Heeria Vaillanti" (Insectes Fossiles des 

 Temps Primaires, ]i. 380, ])1. XXXVII. . 22. fig. 12; pi. 



