Mr. R. Shelford’s Studies of the Blattide. 233 
Brief diagnoses of these two sub-families may be given 
as follows :— 
Ecrosiun&z.—Femora spined beneath ; sub-genital lamina 
of female not provided with valves; supra-anal lamina not 
quadrate or lobate ; wings when present with a conspicuous 
triangular apical field or reflected apical area, the ulnar 
vein simple or bifurcate; tarsi without pulvilli. 
PHYLLODROMIINE—Femora spined beneath ; sub-genital 
lamina of female not provided with valves; supra-anal 
lamina not quadrate or lobate; wings when present with 
or without a triangular apical field, never with a reflected 
apical area, the ulnar vein ramose ; tarsi without pulvilli. 
In spite of this new importance attached to the form of 
the vena ulnaris of the wings only three changes of genera 
are necessitated, viz. Pseudectobia is transferred from the 
Ketobiinz to the Phyllodromiine ; Hemithyrsocera, Sss., 
and Mallotoblatta, Sss. and Zhutn., from the Phyllodro- 
miinz to the Ectobiine. Pseudectobia was considered by 
de Saussure as a division only of the genus Theganopteryz, 
Br., but such species as P. insularis, Sss., and P. liturifera, 
Stal., in their general facies are quite Phyllodromiine in 
appearance and moreover have the femora strongly spined, 
whilst the supra-anal lamina in some species is produced. 
Hemithyrsocera nigra, Br., and H. histrio, Burm., have been 
actually re-described by de Saussure (Mél. Orthopt. ii, 
pp. 50 and 52, 1869) as Theganopteryx indica and Th. 
jucunda respectively, surely sufficient testimony to the 
difficulty of discriminating between Ectobiinze and Phyllo- 
dromiine, if no account is taken of the form of the vena 
ulnaris alarum. JMallotoblatta is placed by de Saussure 
and Zehntner with some doubt in the Phyllodromiine, 
and the sub-family Ectobiine is suggested by these 
authors as the correct resting-place for this interesting 
genus, If the form of the vena ulnaris alarum in con- 
junction with the extent of the triangular apical field is 
consulted by systematists, I believe that little or no 
difficulty will be experienced in deciding into which of the 
two sub-families a given species is to be placed. Some 
exceptions, it is.true, must be noted; firstly, the new 
genus described below on page 247, which, though quite 
evidently closely allied to Anaplecta, nevertheless has the 
vena ulnaris alarum ramose; secondly, Phyllodromia 
