76 PROCEEDINGS OF THE NATIONAL MUSEUM VOL, 97 
Mr. Barber and I, however, are agreed that neither of these forms 
belongs in Photuris, and Mr. Barber further thinks, on comparing 
them with samples of Bicellonycha Motschulsky, 1853, in the col- 
lection of the National Museum, that neither belongs there, although 
the cleft claws are a feature of the original description of Bicellonycha. 
Moreover, there is considerable doubt whether the genonym Bicel- 
lonycha is available anyway, because its originally designated genotype, 
Lampyris albilatera Gyllenhal, 1817, is believed by Mr. Barber to be 
properly assigned to the genus at present called Photinus. 
Type of genus: Presbyolampis immigrans, new species, described 
below. 
For the time being I am leaving open the question of whether the 
new Jamaican form and the Honduran one are congeneric, but there 
is sufficient resemblance to open up interesting speculations on the 
possible position of Presbyolampis as a descendant of ancient waif mi- 
grants from the Central American mainland across water gaps, as 
argued by Darlington (1938). 
PRESBYOLAMPIS IMMIGRANS, new species 
PuaTE 1, Figure 10; Puats 2, Figure 20; Piare 3, Figure 25, 31 
Field characters —Length 8.0 to 8.5 mm., width 3.5. Both tarsal 
claws of each foot bifid; photogenic organs occupying only median 
half to third of abdominal sternites 6 and 7; sternite 8 with long slender 
point projecting posteriorly from middle of posterior margin; pronotum 
conspicuously short; elytra uniform dark brown to black. 
Male.—Pronotum about 1.6 by 2.7 mm.; front margin blunt, but 
in two out of three specimens is produced at center to obtuse peak; 
side margins subparallel in basal half; hind margin sinuous, with hind 
angles produced posteriorly to conspicuous acuteness (60°); margins 
slightly uptilted at sides, markedly so in front; disc black, lateral 
borders white, apical border light brown; surface glistening and 
roughly pebbled; vestiture fine, dark, and very sparse. Scutellum 
dark brown centrally, light brown at margins. Mesonotal plates 
black. Elytron about 6.6 by 1.6 mm., uniform dark brown except 
for very narrow lateral white border and even narrower sutural one; 
parallel-sided to apical third where taper begins, mainly in lateral 
margin; surface as in pronotum. Head width 1.75 mm. Eye oval, 
1.1 by 0.9 mm. and projecting from beneath pronotum. Frons width 
0.6 mm.; very concave; medium to dark brown, then suddenly black 
dorsally; interocular margins very divergent (30°). Maxillary and 
labial palpi ight brown to white and of similar subconical shape. 
Antennae 2.8 mm.; medium brown; segments 6 to 8 each two and 
one-half times as long as wide, with rather long vestiture. Tibiae, 
