94 
Psyche 
[March 
of the Hemiptera, etc., and should not be designated as 
such. This lobe is homologous with the so-called alula of 
Coleoptera, etc., but the term alula was applied to the anal 
lobe of the Dipterous wing by Osten-Sacken, 1896, as was 
mentioned above, and since the jugum is formed in this 
region, it is preferable to refer to it as the jugalula, as 
in the case of the homologous structure in the roach and 
other insects (Isoptera, etc., described in Bull. Brooklyn 
Ent. Soc., 23, p. 113 and Psyche, 34, p. 59). The veins in 
the lobe labelled a in Fig. 1 may be called the axillary or 
postanal veins. They serve to strengthen the lobe when it 
is used as a jugum, as is the case in the fore wing of 
Notiothauma. They are apparently absent in the hind 
wing, since the lobe is not used as a jugum in this wing. 
The elongated sclerite just below T the label ha in the lobe of 
the fore wing (Fig. 1) is probably the homologue of the 
alar ossicle called the basanale in the roach, etc. (paper 
cited above). The jugalular lobe a of Figs. 1 and 2 is bor- 
dered by the axillary cord or ligamentum, which bears a 
fringe of hairs labelled af in Figs. 1 and 2. 
Since the venation of the hind wing is comparatively 
simple, it will not be necessary to discuss each of the veins 
in detail, and the labelling of the wing will be sufficient to 
indicate the homologies of the veins. There are a few 
points, however, which merit separate consideration in 
comparing the two wings. 
The hind wing is somewhat shorter and narrower than 
the fore wing in actual millimeters, but in proportion to its 
length, the hind wing is a little broader (proportionately) 
than the fore wing, and is a little narrower at its base 
than the fore wing is. Its jugalular lobe a (Fig. 2) is 
likewise somewhat weaker than the corresponding lobe of 
the fore wing ( a of Fig. 1). 
The hind wing has no such pronounced curve in the costal 
margin beyond the humeral veinlet h (Fig. 2) as occurs 
in the fore wing (Fig. 1), and the cellules in the costal 
region of the hind wing are less numerous than in this 
region of the fore wing. The costal veinlets of the hind 
wing are more “normal” or regular; and the costal space 
is not so broad in the hind wing as it is in the fore wing. 
The cross veins of the hind wing, like those of the fore 
