1QIO. | F. H. GRAVELY: Alluaudella himalayensis. 311 
female of one of these forms is discovered, whether it has under- 
gone any simplification parallel to that found in the male; but in 
view of the restriction of the simplification in the male apparently 
to the wings, it is perhaps more probable that this is associated 
with an increase in the specialization of the female for the seden- 
tary life which she must be supposed to lead. 
Redescription of genera and species—a summary. 
The genera Cardax and Alluaudella may be at once distin- 
guished from all other known cockroaches by the simplicity of 
their venation. In both tegmina and wings a vena spuria is 
present which has combined with the mediastinal (which however 
may be rudimentary) radial, anterior and posterior ulnar, and 
anal veins to form a definite radial system: and alternating 
with these veins is a system of secondary veins essentially arising 
freely in the wing and extending to the margin, but often con- 
nected by irregularly developed cross-veins with the primary veins 
on one or both sides of them, and sometimes so completely 
joined to one of these veins as to appear simply as a branch of it. 
So far as is known the posterior ulnar vein of the wing (but not of 
the tegmen) is invariably forked; and other primary veins are 
sometimes also forked near the margin of the wing or tegmen in 
certain specimens. Differences in the venation are therefore apt 
to be apparently much greater than they really are, and in the 
three species now known they can hardly be considered of generic 
importance. 
The genera may be distinguished from each other by the 
absence of ocelli and the exposure of the vertex of the head in 
Alluaudella ; and the presence of ocelli and covering of the vertex 
by the pronotum in Cardax. 
The latter genus contains one known species only, C. willeyi, 
Shelford ; the former contains two species which may be distin- 
guished as follows: eyes reduced (posterior ulnar vein of tegmen 
joined by the bases of the secondary veins on each side of it), 
A. cavernicola, Shelford; eyes large (posterior ulnar vein of 
tegmen joined by the base of the secondary vein behind it only, 
other secondary veins of tegmina and all those of the wings with a 
distinct tendency likewise to arise from some point in the course 
of the primary vein immediately in front of them), A. hima- 
layensis, sp. n., described above. | 
List of papers referred to. 
1908. Shelford, R.—‘‘Some new Genera and Species of Blat- 
tide, with notes on the Form of the Pronotum in the 
subfamily Perispheeriine.’’ Ann. Mag. Nat. Hist. (8) 
1, pp. 157—177, pl. ix-x (1908). 
Ig10, Shelford, R.—‘‘ A new cavernicolous Cockroach.’’ Ann. 
Mag. Nat. Hist. (8) vi, pp. 114—116, text-figs. (IgI0). 
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