148 
Psyche 
[Sept. 
in the section headed 4 4 Material examined. ’ ’) The wings 
(tig. 1) are specific for this insect, but male genitalia 
should be examined to confirm identifications whenever 
possible. A photograph of the wings has not previously 
been published, though Costa Lima (1943, figs. 54, 55) has 
given excellent photographs of the Brazilian N. prestoni. 
Size variation is indicated by the Pittsburgh series, a 
front wing of each of the males measuring (length in 
millimeters) 5.1, 4.8, 4.8, 3.6, respectively, and a front 
wing of each of the females from the same series measur- 
ing 7.5, 6.3, 6.1, 5.6, respectively. Forewings of the 
Odenton and Bainbridge males measure 4.2 and 4.3 mm. 
Male antennae usually include 9 pectinations (plus the 
apex of the central axis), though a few specimens have 
10 pectinations. 
Immature stages of Nallachius americanus 
Eggs . — One female examined (opposite Homewood 
Cemetery) has a cream-colored egg held at the apex of 
the ovipositor. It measures about 0.37 X 0.13 mm. and 
is rounded oblong. 
Larva . — General body shape slender, elongate, convex 
(fig. 6) ; body setae sparse, inconspicuous, long, and 
slender; spiracles well developed on mesothorax and ab- 
dominal segments I-VIII, scarcely noticeable without 
compound microscope. Head with elongate, somewhat 
blunt jaws of usual Planipennia type (figs. 11, 14) ; no 
fracture line of jaws evident; mandible and maxilla sub- 
equal in size ; apex of maxilla with sensory setae and 
spiculelike teeth; front triangularly produced between 
and anterior to antennal bases ; a single dark pigmented, 
lateral eye spot ; a tiny curved spine immediately anterior 
to eye. Antenna with 2-5 ring segments following scape 
(total segments 5-8) ; penultimate segment enlarged, 
bearing postapical peglike organ (sensory!) and 2 small 
setae externolaterally ; apical segment with one long prin- 
cipal seta and several minor ones. Prementum apically 
incised; labial palpus with 2-5 ring segments following 
basal segment (total segments 5-8). Cervical region 
(microthorax of Tillyard, 1916) with well-developed 
dorsolateral lobes. 
