407 
other pair is placed at the posterior corner of the vertex close to the 
occipital margin. 
General color black, but the head and abdomen may be more or less 
fuscous brown, the base of abdomen more or less distinetly yellowish, 
although in many cabinet specimens appearing wholly dark. Mandibles 
pale brown; antennae dusky yellow; legs pale yellow, the front femora on 
dorsal side and front tibiae except at apex slightly brownish; middle coxae 
at base, hind coxae, middle and hind tibiae fuscous to blackish, the apical 
half of the middle femora more dilutely fuscous; tarsi, especially beneath, 
more brownish-yellow than the other paler parts of the legs, and the apex 
of the apical joint fuscous. Wings hyaline, but faintly tinged with fuscous, 
especially beneath the marginal and stigmal veins; the veins yellowish. 
Length of body (0.554 to 0.990), 0.903; length of head, 0.276; width 
of head, 0.886; thickness of head fronto-occipitally, 0.191; width of vertex 
at posterior ocelli, 0.151; length of antenna, 0.363; width of mesoseutum, 
0.358; length of fore-wing, 0.858; width of fore-wing, 0.396 mm. 
Male. Very similar to the female and distinguished with difficulty in 
case of dry specimens, but averaging considerably smaller in size and with 
the wings often a little clearer. 
Length of body, 0.533 to 0.811 mm. 
Described from the following material: 32 females, 22 males 
(holotype, allotype male, and paratypes), reared from Aphis 
maidis Fitch, in Honolulu, December, 1919, to February, 1920 
(Timberlake); 1 female (paratype) reared from Aphis maidis 
on grass, Ewa Plantation, Oahu, May 19, 1922 (Timberlake) ; 
2 females, 1 male (paratypes), from same host on corn, Manoa 
Valley, Oahu, April 10-11, 1923 (Timberlake); 2 females, 2 
males (paratypes), collected on sugar-cane, Mountain View, 
Hawau, January 21, 1918 (Timberlake); 8 females, 6 males 
(paratypes), reared from Aphis sacchari Zehntner on sugar- 
cane, Honolulu, August 18-25, and September 13, 1916 (Tim- 
berlake); 1 male (paratype) from the same host on sugar-cane, 
Ewa Plantation, Oahu, August 3, 1918 (Timberlake) ; 1 female 
(paratype) collected in Honolulu, March 21, 1917 (Timber- 
lake); 1 male (paratype) reared from Aphis sacchari, Hawaii 
Mill Co., Hilo, Hawaii, September 16, 1913 (Swezey); 1 female 
(paratype) collected at Waikea, Hawaii, October 2, 1913 
(Swezey); 1 female (paratype) collected at Waialua, Oahu, 
January 8, 1923 (Swezey); 1 male (paratype) reared from 
Aphis sp. on Scirpus maritimus L., Honolulu, January 7, 1913 
