416 
side near the middle, the apical margin of the joint is more nearly straight 
on both sides, or only gently arcuate, whereas it is deeply angularly emar- 
ginate on the outer surface in semifuscipennis; the fore-wing narrower 
with fewer or about twenty discal hair lines at widest part of the disk, 
semifuscipennis having about twenty-five to twenty-eight lines, the disk, 
therefore, distinctly more sparsely pubescent; the marginal fringe dis- 
tinetly longer and practically equal to one-fifth of the greatest width of 
the disk, but in semifuscipennis equal to about one-seventh of the width of 
the disk. 

Fig. 8. Aphelinoidea xenos. Antenna of female. 
General color much paler than in semifuscipennis or yellowish brown 
instead of piceous. Dry specimens are brown, with most of the head, the 
dorsum of the thorax and sometimes apex of the abdomen above paler and 
more or less yellowish, and with the lower half of the occiput, the cheeks, 
lower part of the face, the sternum, pleura, and most of the abdomen fuscous 
brown. In balsam mounts the coloration is dusky yellow, with the lower 
half of the occiput, the cheeks, oral margin of face, sternum, pleura, and 
transverse bands on the abdomen appearing rather dilutely fuscous, these 
darker parts being not very conspicuous nor sharply bounded except on 
the occiput, the bands on the abdomen sometimes confined to the basal 
half or two-thirds; rest of the face, apex, and part of the venter of abdo- 
men purer brighter yellow, the frontovertex orange yellow; eyes and ocelli 
bright carmine; antennae clear yellow; legs dusky with the tips of the 
tibiae and the tarsi paler and more yellowish. 
Wings hyaline, but with basal part beneath the venation clouded with 
fuscous, the apical margin of the cloud extending slightly obliquely distad 
from the apex of the stigmal vein towards the opposite margin and into 
the pubescent area of the disk; the cloud also with a darker triangular 
area beneath the apex of the marginal vein, the apex of the triangle touch- 
ing the vein; just proximad is a slightly clearer area, somewhat similar 
in shape, but smaller and with the base of the triangle against the vein, 
sometimes this clearer area is more diffused and extends along the vein 
towards the base of the wing; hind-wings with a short slightly clouded 
