415 
beginning on the posterior margin opposite the stigmal vein and consist- 
ing of about twenty-six setae, the first one opposite the stigmal vein being 
a little smaller than the discal seta just preceding it which is mentioned 
above; the following setae rapidly increasing in length, those at and on 
both sides of the apex about one-half as long as the wing itself, those 
on the anterior margin gradually and slightly decreasing in length basad 
and abruptly terminating at a point slightly more than midway between 
the apex of the wing and the stigmal vein; the remainder of the costal 
margin to the stigmal vein provided with a fringe of exceedingly minute 
short setae about five in number and visible only under high magnification. 
Hind wing exceedingly narrow but triangularly widened at the hook- 
lets, and slightly widened again at the apex which is rounded; no discal 
setae present; marginal fringe composed of twelve setae beginning on 
the posterior margin just beyond the hooklets and abruptly terminating 
on the anterior margin at the apex of the wing, only two of the setae 
being situated on the anterior side of the apex; the setae also rapidly 
increase in length towards the apex, where they are only slightly shorter 
than those of the fore-wing. 
Tarsi of front legs distinctly longer than the front tibiae; tarsi of 
middle and hind legs (Fig. 7b) slightly shorter than the corresponding 
tibiae. 
No definite surface sculpture observable under high magnifieation. 
Head and thorax rather pale yellow, the eyes black; antennae and legs 
pale yellowish; occiput of head and the abdomen brown; wings hyaline, 
but the hind pair are rather distinctly infuscated at and near the hooklets. 
Length of body, 0.252; length of antenna, 0.162; length of fore-wing, 
0.229; greatest width of fore-wing, 0.031; greatest length of marginal 
fringe of fore-wing, 0.185; width of thorax, 0.118; length of thorax and 
abdomen combined, 0.195 mm. 
Described from two females (holotype and_ paratype) 
mounted on a slide with fragments of about three other females 
which were accidentally crushed during preparation. These 
specimens were collected by Mr. C. E. Pemberton late in 
January, 1920, on the leaves of a forest tree at Mountain View, 
Hawaii, where they were associated with Thysanoptera. Mr. 
Pemberton had a suspicion at the time that the MWegaphragma 
were parasitic on the thrips. This species is presumably an 
immigrant in the Hawaiian Islands, but of this there is, of 
course, no direct proof at present. 
Aphelinoidea xenos n. sp. Fig. 8. 
Female. Structurally similar to A. semifuscipennis Girault, but the 
basal joint of the club shows no transverse groove or suture on the ventral 
