280 On a neiv Species of Vidoythns from West Africa. 



segment trifid, with the middle section pointed in front, as in 

 P. centaurus c? . Front femora and tibiiB hardly curved, 

 the others more or less so ; four hinder tibiie with an oval 

 lamella near the extremity above, which is rudimentary on 

 the front tibia? ; middle femora with a large single or double 

 laminated and rectangular projection near the base ; right- 

 hand tibia with a small tooth on the under surface just beyond 

 the lamella. Tegmina brown, blackish in the middle, with 

 ill-defined white spaces towards the base, and near the middle 

 of the costa. Coriaceous portion of the wings wood-brown, 

 with blackish, occasionally interrupted, lines on the longitu- 

 dinal nervures. Membranous portion of the wing hyaline, 

 nearly the apical third (from about one third of the length on 

 the costal side to about two fifths of the length of the hind 

 margin) reticulated with light brown, and large partly con- 

 nected white spots and markings, irregularly arranged in 

 rows. The inner oblique border of this tessellated area 

 becomes indistinct and irregular, fading into the hyaline 

 portion of the wing. 



I/ab. Bonthe, Sherbro, W. C. Africa. 



This specimen was found by Mr. T. J. Alldridge (after whom 

 I have named it at his request) in his bedroom at Bonthe, and 

 kindly presented by him to the Museum. The male is allied 

 to Falophus centaurus^ Westw., but longer, more slender, and 

 with variegated wings. From P. hippotaurus, Karsch (which, 

 judging from the di scription, I refer to Bactrododema, Stal), 

 which it resembles in wing-coloration, it differs by its unarmed 

 thorax. The males of P. centaurus in the Museum have the 

 tips of the wings only slightly clouded, much less so than in 

 the insect described and figured by Brongniart (Nouv. Arch. 

 Mus. Paris, (3) iii. p. 197, pi. viii., 1892), which has the outer 

 subcostal area of the wings tessellated, and perhajis belongs 

 neither to P. centaurus nor to P. Alldridgei. The exact 

 locality of Brongniart's specimen is not stated. 



Female. — Light greyish brown ; head with an erect double 

 lamellated crest, tridentate above and slightly dentated in 

 front ; behind its base are two rows of raised spines on each 

 side, the front and inner ones longest. Mesothorax with a 

 short black dash on each side about the middle, but asym- 

 metrical. Abdomen with a slight double lamella on the fifth 

 segment. Front femora with a row of undulated lamelloi 

 above and two near the middle on the outer side ; tibiae with 

 three more distinct double ones on the outer and two smaller 

 ones on the iimer side (tarsi wanting). Middle and hind 

 femora and tibire much arched, tiie femora with a large 

 lamella above and below near the base ; tibite with several 



