TEN NEW FIREFLIES FROM JAMAICA——-BUCK 71 
“thumb” (pl. 3, figs. 30, 35). Aedeagal characters have already been 
considered, but this additional comment is relevant: Barber, in propos- 
ing the genus in 1941, designated as genotype D. bucki Barber, a 
form in which the aedeagus is greatly elongated and similar only to 
that of D. mast: described below (pl. 3, fig. 26).. However, a survey of 
aedeagal shapes in known diphotids suggests that there may be com- 
plete intergradation between the greatly attenuate lateral and median 
lobes in the two above mentioned species and the short compact 
structures of Microdiphot cavernarum Barber (pl. 3, fig. 28). Some 
idea of the size ranges encountered is given by plate 3, figures 26, 27, 
and 28. 
DIPHOTUS DAHLGRENI, new species 
PuateE 1, Ficgure 6; Puate 2, Figure 17; Puate 3, Figure 22 
Field characters —Length 7.5, width 3.2 mm.; oval; pronotal disc 
and elytra medium brown with broad white borders; abdominal 
sternites and tergites progressively darker to black hind end. 
Male.—Pronotum 1.9 by 2.4 mm.; front margin semicircular, 
lateral margins subparallel in basal third, hind margin nearly straight; 
disc medium to dark brown with wide white border anteriorly and 
laterally, a narrower one along the hind margin. Scutellum and 
mesonotal plates dark brown. Elytron 5.6 by 1.6 mm.; widest at 
middle, lateral margin tapering smoothly in both directions; medium 
red-brown with white lateral border about one-third the elytral 
width, no sutural border. Head width 1.6 mm. Eye length 1.0 
mm. Frons width 0.5 mm., black, deeply concave; interocular 
margins subparallel. Maxillary and labial palpi light brown to 
white. Antennae 3.2 mm., dark brown, segments 6 to 8 each a little 
more than twice as long as wide. Femora, tarsi, coxae, and ventral 
surface of thorax light brown, tibiae dark brown; claws medium 
brown; circlet of about a dozen slender spurs along the distal edge 
of the tibiae (pl. 2, fig. 17). Tergites grading progressively from 
light brown tergite 1 to jet black, semicircular pygidium. Sternites 
progressively darker from light brown (2) to black (7); 8 white, 9 
lost, all with hind margins straight except 7 which resembles that of 
P. immigrans (pl. 2, fig. 20). Aedeagus (pl. 3, fig. 22, a-c) somewhat 
similar to those of D. unicus Mutschler and D. semifuscus Barber; 
lateral lobes white, closely apposed dorsally, internally hollowed, 
tapering posteriorly to slender apices tilted slightly dorsally; at 
apical fourth each lateral lobe has an anteriorly directed hook or 
tooth on its ventral surface in contact with the median lobe; median 
lobe white, cylindrical, lying deeply ventral in its basal two-thirds, 
constricting suddenly at about the level of the apical third of the 
lateral lobes to a laterally compressed thin sclerotized vane, which 
curves dorsally between and just short of the tips of the lateral lobes; 
