om, 
409 
Sculpture about the same as in maidis, except that the setiferous pune- 
tures of the frontoyertex are less numerous and less distinet; the pubes- 
cence the same, but sparser on the frons. 
Color of the head and body shiny black, the base of the abdomen more 
or less distinctly yellow, the extreme tip of the abdomen and the ovi- 
positor sheaths also yellowish. Mandibles pale brown; scape, and some- 
times the pedicel, pale brown or dilutely fuscous, the rest of antenna dusky 
yellow. Legs, including coxae, blackish; apex of front femora, front tibiae 
except for a more or less distinct infuscation on the basal half, front 
tarsi, middle trochanters, apex of middle tibiae with spur and tarsi and 
hind tarsi except basal joint brownish yellow; hind trochanters and hind 
femora clear pale yellow. Wings almost hyaline, the veins yellowish. 
Length of body (0.598 to) 0.914; length of head, 0.351; width of head, 
0.443; thickness of head fronto-occipitally, 0.165; width of vertex at pos- 
terior ocelli, 0.174*; length of antenna, 0.434; width of mesoscutum, 0.396; 
length of fore-wing, 0.903; width of fore-wing, 0.405 mm. 
Male. Very similar to the female, but smaller and with the antennae 
slenderer, the club being hardly wider than the funicle and more pointed 
at apex than in the female. 
Length of body (0.452 to), 0.747; length of head, 0.295; width of 
head, 0.358; thickness of head fronto-occipitally, 0.160; width of vertex 
at posterior ocelli, 0.153; length of antenna, 0.403; width of mesoscutum, 
0.302; length of fore-wing, 0.754; width of fore-wing, 0.349 mm. 
Described from 25 females, 9 males (holotype and para- 
types) reared from Aphis gossypii Glover collected in Honolulu 
in May, 1919, and in March, 1923; ‘also 1 female (paratype) 
associated with this Aphis on Hibiscus in Honolulu, April 12, 
1918 (Timberlake) ; 1 male (allotype), labelled “on bean Aphis,” 
presumably Aphis medicaginis Koch, collected in Honolulu, No- 
vember 22, 1904 (Swezey); and 1 male (paratype) collected at 
Kilauea, Hawaii, in July, 1906 (Dr. Perkins). 
This species of Aphelinus is very similar to A. mali ( Halde- 
man), but is readily distinguished by the characters given in the 
following table of species. 
Aphelinus semiflavus Howard. 
Three females reared February 29, 1916, from To-xroptera 
aurantu (Fonscolombe) collected on the Manoa Cliff trail on 
Tantalus, Oahu, and one female reared March 30, 1918, from 
* Head somewhat shriveled, so that the measurements are necessarily 
more or less inaccurate. 
