1934 ] 
Identity of an Introduced Psychid 
31 
the cell and does not fork within the cell. On the fore wing, 
the 1st anal does not reach the margin, and the 2nd and 3rd 
anals, coincident from near the base, extend to the margin 
without fork or branch ; some variation exists in the origin 
of the two lower radials, which may arise from a point at 
the cell, may be shortly stemmed to the cell, or may be 
separated at their origins on the cell. 
The hind wing has three anal veins, the 2nd sometimes 
tending toward union with the 1st by exhibiting a slight 
angulation and trace of a spur ; the radius and subcosta are 
not joined beyond the base; Mi may arise as in the figure, 
or as a direct continuation of the media. 
This is all in accord with Fumea casta as illustrated by 
Chapman, but not in agreement with Bruandia and Proutia 
(which have media of fore wings forked within the cell), 
included under Fumea by Seitz. 
Legs of male (Plate 3, fig. 5). — In Fumea and its allies 
the length of the anterior tibial spur (the epiphysis) has 
been extensively used in the separation of genera and 
species. Chapman’s measurements, thus used and quoted, 
though designated as spur ratios, really relate to “the ratio 
of the' length of the tibia beyond the origin of the spur, to 
the whole length of the tibia.” For Fumea (excluding 
germanica) Chapman gives this ratio as .77-.81. This 
range is evidently too narrow, for Burrows, who inherited 
Chapman’s collection and added to it, measured 236 Fumeas 
(including Chapman’s series), and found a ratio range of 
.72 to .81. Evidently the method of preparation and meas- 
urement, as well as individual variation, affect the rigid ap- 
plication of this character. 
Balsam mounts of the legs of Massachusetts Fumeas give 
us an average ratio of .76, with a minimum and maximum 
of .72 and .79. 
Legs of female (Plate 3, fig. 6). — These agree with casta 
in having five joints to the tarsi of all legs. A single ves- 
tigial apical 1 spur is sometimes present on the fore tibia, 
rarely present on the mid-tibia ; may be present on one tibia, 
absent from the corresponding opposite tibia of the same 
insect. When present, it varies in shape from almost 
globular to elongate with a length twice its diameter. These 
