34 
Psyche 
[March 
Microdictya hamyi (Brongniart) 
Figure 72 
Heeria hamyi Brongniart, 1893: 390. 
Microdictya hamyi Brongniart, 1893: 390, pi. 22, fig. 3; Handlirsch, 1906: 
66, pi. 9, fig. 7; Handlirsch, 1919: 6. 
This species was based by Brongniart on two well preserved fore 
wings of specimen 23-3. Bolton (1917, p. 8) identified as the same 
species a fragment (apical part of a wing), from Commentry and 
now in the Mark Stirrup collection in Manchester. This probably 
does belong to Microdictya but its specific position is obscure. 
Fore wing: length 80 mm, width 22 mm. Fore wing almost 
oval in shape, broadest at about mid-wing. Apex of wing directed 
posteriorly. Apical part of wing relatively broad and short. Sub- 
costal area narrow, almost band-like; Sc-r area very broad, Rs 
originating not far before mid-wing, with four branches. MP and 
CuP with two branches. Cup-ia area very broad. Anal area long, 
narrow, with 5 anal veins. Branches of M and Cu strongly curved 
towards the posterior margin. Archedictyon dense. 
This species differs from all others by the convex curvature of 
M and Cu branches towards the posterior margin and by the broad 
cup-ia area. The archedictyon is almost as dense as in vaillanti but 
less irregular, tending to be arranged into cross veins. 
Microdictya lacroixi Meunier 
Figure 76 
Microdictya lacroixi Meunier, 1910: 235, fig. 2; Meunier, 1912: 6, pi. 6, 
fig. 2; Handlirsch, 1919: 6, fig. 8. 
This species was based on a well preserved hind wing with a 
relatively sparse archedictyon. Unfortunately, I could not locate 
the type of this species in the Institut; the figure included here was 
made from Dr. Carpenter’s 1938 photograph. 
Hind wing: length: 51 mm, width 15 mm. Anterior margin 
almost straight; posterior margin regularly curved. Hind wing 
broadest shortly before midwing. Rs originating well before apex, 
with 3 branches, first of them forked three times. MP reaching the 
posterior margin with its 3 branches. CuP giving rise to one branch. 
Anal area long and narrow, with 5 pectinate branches. Archedictyon 
sparse, more in the form of irregular cross veins connected by 
anastomoses. 
Microdictya lacroixi is related to villeneuvei by its sparse arche- 
dictyon but differs in wing shape. From the other species with 
similar wing shape, it differs in the archedictyon. 
