TEN NEW FIREFLIES FROM JAMAICA—BUCK 61 
seen extruded. On both lateral and median lobes accessory structures 
such as hooks, knobs, and teeth may be present. By “length of lateral 
lobe’’ is meant the distance from its apex (posterior end) to the nearest 
part of the basal piece. 
It is difficult to make generic generalizations concerning the aedea- 
gus, but Photinus seems to differ from Diphotus in. having lateral 
lobes that in dorsal aspect are close together only in their basal third 
or less and are usually widely separated distally except at their apices, 
which curve evenly close together. In Diphotus, on the other hand, 
the lateral lobes are generally rather straight-sided in both margins 
and are usually close to each other dorsally throughout most of their 
lengths. In Photinus the functional orifice of the median lobe is 
dorsal; in Diphotus it is ventral. 
All the drawings of aedeagi were made under a 16-mm. objective 
with a camera lucida at magnifications of 130 to 200 diameters. Re- 
produced sizes can be judged from the }-millimeter scale lines in- 
cluded with each set of drawings. 
In regard to color I use ‘‘white’’ to include also very pale gray or 
very light yellow (in contrast to ‘ight brown,” implying straw, pale 
tan, or khaki), and “black’”’ to include also very dark brown (in 
distinction to ‘‘dark brown,’’ which I use to include chocolate, rich 
brown, or sepia). 
Properties of the chitinous surface are described with considerable 
reservation because the decisions as to whether a surface is studded 
with minute elevations or with minute depressions, or whether it is 
glossy or dull, often rests solely on the type of illumination used and 
is further obscured by the degree of pubescence of the surface, which 
is itself difficult to determine and describe accurately. 
Length measurements always precede width. Length of the insect 
as a whole is always given as from the apex of the pronotum to the 
apices of the elytra and is ordinarily obtained by measuring pronotum 
and elytra separately, then adding, because the body is often flexed 
at the promesothoracic joint in pinned specimens. 
The terms ‘‘sternites”’ and “‘tergites’’ as used herein refer always to 
the abdomen. In the Lampyridae the first sternite is vestigial or 
obsolete, sternite 2 being the first visible. In the male, sternite 9 
is reduced in size and hidden beneath tergite 8, the pygidium, forming 
part of the sheath of the aedeagus. Likewise tergites 9 and 10 are 
reduced, fused, and usually hidden under the pygidium as part of the 
aedeagal sheath. 
Head and eye dimensions were measured at 40 diameters with a 
micrometer ocular, the eye in the anteroposterior axis (though firefly 
eyes are nearly always round in lateral aspect) and the head from the 
front (i. e., the greatest distance from the most lateral surface of one 
