526 Mr. G. J. Arrow o)i 



Avith tliat <;tMius tliiui witli any other. Tlie occurrence of a 

 hairy olutliin^ and of white chalky patclics, the shape of the 

 scutelluin, acutely pointed but not concave at the sides, the 

 more slender front tibia and 5»;roovcd abdomen of the male, 

 are features shared with tliat f>enus, and the shar[)ly 

 bidentate clypeus, although not of the form characteristic 

 of Giiathocera, may be considered to be the more primitive 

 type from which that of Giidthncera has been derived. The 

 broad flat sternal process and the very feeble excision of the 

 outer margins of the elytra suggest relationship to the Cera- 

 torrhhia group with horned males, but the form of the 

 female, even more than that of the male, precludes that 

 conclusion; while affinity with Porphyronota and allied 

 genera is negatived by the strongly accentuated sexual 

 difl'erences. 



Perhaps the most distinctive of the many peculiar features 

 of the new genus is the elongation and flattening of the 

 extremities of the elytra, which entirely conceal the abdo- 

 men from above. The outer margins are minutely serrated 

 on their posterior half and uniformly rounded to the sutural 

 angle, which is shar() but not spiniform. In the angle there 

 IS a tuft of the })alc-coloured settc, which are extremely fine 

 and scanty upon the remainder of the upper surface. The 

 elongation of the elytra is more pronounced in the female 

 than in the male. In addition to this the pygidium of the 

 female is very oblicjue, the abdomen very convex, the tibije 

 much stouter than those of the male, and the tarsi much 

 shorter. The chalky-white patches are not pi'esent in the 

 only female examined. 



Gnathocera nigrul'uteata, sp. n. (PI. VIII. fig. 3.) 



Xigra, nitida, pedibus abdominequo rufis, albo-tomeiitosa, capitis 

 medio, pronoti inargiiiibus et lineis duabus longitiidinalibus 

 elevatis, scutcllo, linea mediana excepta, elytronim niargiiiibus 

 et lineis duabus elevatis postice coiijuiictis, pygidii apice et linea 

 mediana, corporis subtus linea mediana, femoribus partim, tiljiis 

 tarsisque totis niidis, capite prouotocpie setis nonnullis niinutissi- 

 rais instractis, thorace subtns femoribusquo sat parce fulvo- 

 vestitis, abdomiiie nudo, processu stornali gracili, curvato. 



Long. 16 mm. ; lat. max. S-o mm. 



French Guinea : Kondia. 



A single female specimen of this species was taken upon 

 a termites' nest by Prof. F. Silvestri, by whom it has been 

 presented to the British Museum. 



It is a very distinct species, resembling no other ut 

 present known in the black and white striping of the elytra. 



