EXPLANATION OF PLATES 
Puate 1 
Dorsal Views 
{In trimming the photographs the legs, which ordinarily project laterally beyond 
the elytra, were removed. In some specimens the abdomens were removed 
for study, and this accounts for the lightness of the area between the elytra. 
A few regions have been retouched slightly to restore contrast. The whitish 
specks on some of the elytra (e. g., fig. 10) are highlights.] 
1, Photinus lewisi; 2, Photinus pardalis; 3, Photinus nothoides; 4, Photinus har- 
veyi; 5, Photinus elisabethae; 6, Diphotus dahlgreni; 7, Diphotus darlingtoni; 
8, Microdiphot barberi; 9, Diphotus masti; 10, Presbyolampis immigrans. 
PLATE 2 
Detailed Structure 
[Figures in a, b, c series represent dorsal, left lateral, and ventral views, respec- 
tively, of a single aedeagus, with the basal or anterior end upward. Mag- 
nification is not uniform but can be judged from the scale lines included, 
which are all 0.5 mm. In fig. 20 (and also figs. 32-34 of pl. 3) the relative 
widths of the sternites are not shown accurately because the camera lucida 
does not take account of their varying curvatures, which become fore- 
shortened.] 
11, Aedeagus of Photinus lewisi, new species (LL=lateral lobe, ML=median 
lobe, B=basal piece); 12, aedeagus of Photinus pardalis, new species (IS= 
internal sac); 13, aedeagus of Photinus harveyi, new species; 14, aedeagus 
of Photinus nothoides, new species; 15, aedeagus of Photinus elisabethae, 
new species; 16, inside or ventral surface of tibia of hind leg of Presbyolam- 
pis immigrans, new genus and species (7J=tibia, TA=most proximal 
tarsal segment, S=spur; same labels apply to figs. 17-19); 17, ventral 
surface of tibia of left middle leg of Diphotus dahlgreni, new species, show- 
ing spurs (same magnification as fig. 16); 18, ventral surface of tibia of 
left middle leg of Microdiphot barberi, new species, showing spurs (magni- 
fication same as fig. 13); 19, front view of leg shown in fig. 18 showing 
how spurs are distributed along outer surface of tibia; 20, ventral view of 
posterior part of abdomen of male of Presbyolampis immigrans showing 
photogenic organs (O, cross-lined) on sternites 6 and 7, posterior projection 
of sternite 8, and pygidium (P). 
PLATE 3 
Detailed Structure 
{See note under Plate 2] 
21, Part of pronotum (PR) and elytra (EL) of Photinus elisabethae, new species, 
showing the mesonotal plates (MP) and their relation to the scutellum (SC); 
22, aedeagus of Diphotus dahlgreni, new species; 23, aedeagus of Diphotus 
darlingtoni, new species; 24, aedeagus of Microdiphot barberi, new species; 25, 
aedeagus of Presbyolampis immigrans, new genus and species; 26, aedeagus of 
Diphotus masti, new species; 27, aedeagus of Diphotus darlingtoni reproduced 
to same scale as that of D. masti (fig. 26) to show the enormous absolute size 
difference possible in diphotids of about the same over-all size; 28, aedeagus of 
78 
