26 
Male. — Similar to female, slightly smaller; antenna] club somewhat 
truncate at tip. 
Described from many male and female specimens, mostly reared 
at the Department of Agriculture in 1879 and 1880. The species was 
reared by Le Baron from Mytilaspis pomorum Bouche, in Illinois; by 
Riley from the same species in Missouri; and it is probably the species 
which caused the round holes observed in this scale by Dr. Fitch in 
New York. At the Department of Agriculture it has been reared from 
Mytilaspis pomorum from Illinois and the District of Columbia; from 
Chionaspis pinifolii (District of Columbia), and from the same species 
by Riley in Missouri; and from Diaspis carueli Targioni on juniper. 
Aphelinus abnormis Howard. 
Aphelinus abnormis Howard. Ann. Rep. Dept. A.gnc, L880, p. 355. 
Female. — Length, 0.55 mm.) expanse, 1.4 mm.; greatest width of 
fore-wing, 0.23 nun. General proportions as with A. mytilaspidis, from 
which it differs only in the following respects: The scutellum is pointed 
anteriorly, seemingly entering a reentering angle on the base of meso- 
scutum; antenna! clnb three times as long as penultimate joint; color, 
light lemon-yellow, lighter than the preceding species; antennae dusky; 
legs with yellowish femora and dusky tibiae and tarsi; wings perfectly 
clear; veins transparent. 
Described from one female specimen reared from Mytilaspis pomorum 
on Salix capr&a, District of Columbia. No other specimen of this 
peculiar form has ever been found. There is a possibility that it may 
be simply a dwarfed and distorted specimen of A. mytilaspidis. 
Aphelinus diaspidis Howard (tig. 7). 
Aphelinus diaspidis Howard. Aim. Rep. l>r]>t. Agric, 1880, p. 355. 
Female. — Length, 0.78 mm.; expanse, 1.9 mm.; greatest width of 
fore-wing, 0.27 mm. Differs at once from A. abnormis in the normal 
character of the scutellum and from A, mytilaspidis in the fact that the 
club is three times as long as the penultimate joint, instead of twice as 
long. It further differs from A. mytilaspidis in the following particu- 
lars: The entire space proximad of hairless line of forewing is densely 
ciliated, the cilia but slightly larger than those distad of this line. At 
the abrupt upward bend of the submarginal into the marginal a trian- 
gular clear space occurs, the distal side of which is curved, the apex 
touching the beginning of the marginal vein. The forewings have a 
delicate fuscous patch bending outward from below the stigma and 
covering the entire disk from that point back to the triangular clear 
space. The incision between the penultimate joint of the antennae and 
the club is not well marked, joint 5 apparently forming part of the club. 
Color dull, rather dark yellow; eyes black, ocelli very dark red, antennas 
dusky, darker at tip; a narrow dark transverse line on the occiput 
