TEN NEW FIREFLIES FROM JAMAICA—BUCK 73 
Type.—Museum of Comparative Zoology No. 26747. 
Distribution —Port Antonio, January 4 (no year given), F. C. 
Bowditch collector. 
Named for Dr. P. J. Darlington, Jr., of the Museum of Comparative 
Zoology. 
DIPHOTUS MASTI, new species 
PuaTe 1, Figure 9; PLate 3, Ficures 26, 30, 34-38 
Field characters—Length 8.0, width 3.0 mm. Pronotum with 
dark brown semicircular disc surrounded by white border. Elytra 
nearly parallel-sided, light brown with white borders. Abdomen 
dark brown, increasing to black at apex. 
Male.—Pronotum 1.8 by 2.3 mm.; front margin semicircular, lateral 
margins in one specimen subparallel in basal third, in the other con- 
verging slightly at base; hind margin straight except at hind angles 
which project slightly backward; disc marked with dark brown 
semicircular spot bisected by vague narrow median sagittal light 
brown stripe, bordered apically and laterally by a wide, and basally 
by a narrow white border. Scutellum light brown. Mesonotal 
plates medium brown. Elytron 6.2 by 1.5 mm., nearly parallel-sided 
to apical fourth where it tapers sharply, mainly in lateral margin; 
light to medium brown, darkest at humerus, lateral border white, 
about one-third of elytral width and confluent at apex with narrower 
white sutural border. Head width 1.9 mm. Eye length 1.2 mm., 
projecting beyond pronotum. Frons width 0.5 mm., medium to 
dark brown, deeply concave; interocular margins parallel or slightly 
divergent dorsally. Maxillary and labial palpi white. Antennae 
4.0 mm.; dark brown with basal segment light brown; segments 6 to 
8 each four times as long as wide, and somewhat flattened. Legs 
and ventral surface of thorax light brown; claws medium brown, 
simple but with expanded basal plate or ‘“‘thumb”’ inside the anterior 
claws of the front legs (pl. 3, figs. 30, 35) as in D. bucki Barber and to 
a less extent in D. unicus Mutschler and D. ornicollis Barber; circlet 
of inconspicuous spurs along distal rim of each tibia. Tergites in- 
creasingly dark from medium brown (1) to pygidium, which is brown 
bordered black, very large, ogival to blunt, with slight rounded projec- 
tion from middle of hind margin; 7 and 8 broader than corresponding 
sternites. Sternites increasingly dark from medium brown (2) to 
black (7); 8 and 9 pale with medium brown apical borders; 9 greatly 
elongated and with dark recurved hooks and large muscles on internal 
surface (pl. 3, figs. 36-38) as in D. bucki Barber, suggesting its use as 
aN accessory in mating. Aedeagus (pl. 3, fig. 26, a-c) identical in 
shape, structure, and size with that of D. bucki Barber; lateral lobes 
extremely long and slender, apposed dorsally except briefly at apical 
