406 
and somewhat narrowing forward; ocelli in an obtuse angle, the posterior 
pair about their own diameter from the occipital margin and somewhat 
more distant from the margins of the eyes; facial impression moderately 
deep, with sloping sides, the bottom occupied by the triangularly shaped, 
barely convex prominence, which reaches from the antennal sockets nearly 
to the dorsal end of the impression. Antennae (Fig. 5) inserted moder- 
ately far apart close to the oral margin; scape about four times or a 
little more as long as wide; pedicel about one and two-thirds times longer 
than the first two funicle joints combined; the latter equal, and about one- 
half wider than long; third funicle joint over twice as large as the pre- 
ceeding joint, somewhat wider than long and about one-fourth as long as 
the club; club narrowly oval, as long as the pedicel and funicle combined 
and two and one-third times longer than its own width. Mandibles with 
an acute outer tooth and a broad inner truncation, the ventral or outer 
edge provided also with a strong tooth-like spine or lobe halfway between 
the base and apex. Maxillary palpi two-jointed, the basal joint hardly 
longer than thick, the apical joint about thrice as long; labial palpi two- 
jointed, both joints about twice as long as thick, the apical joint a little 
shorter and slenderer. Thorax and abdomen practically as in related spe- 
cies, such as mali, nigritus, ete. Wings fully developed and with seven 
oblique rows of coarser setae proximad of the speculum, the basal fourth 
of the disk bare. 
a 
A 
Z, 

Fig. 5. Aphelinus maidis. Antenna of female. 
Head very finely, delicately shagreened with reticulations and moder- 
ately shiny, the frontovertex with numerous fine shallow setiferous pin- 
punctures; thorax and abdomen moderately shiny, or about as in nigritus, 
and rather less shiny than in mali; the thorax with extremely fine uniform 
reticulations, the abdomen apparently smooth. In the pubescence of the 
head and body there appears to be not much difference between this and 
related species, but the vertex has two pairs of setae, which are consider- 
ably coarser than the other setae of the frontovertex; one of these four 
setae is placed behind each one of the posterior ocelli, and each of the 
