136 ilr. 0. J'liomas on new 



Dijyloa trideiifi, sp. n. 



Oblongo-ovata, ohesa, fusco-nigra, corpore subtus p\-gidioque rufis, 

 longe fulvo-liirtis, supra undique creberrime puuctato, minute 

 seto.so, cl3peo subquadrato, crebre punctat'^, margine valde 

 reflexo, medio paulo angulato ; prothorace densissime punctato, 

 lateribus sat regulariter arcuatis, aiigulis omnibus obtusis, margine 

 postico leviter trisinuato ; scutello dense punctato ; elytris con- 

 vexis, vage costatis, subtiliter punctato-striatis atque rugoso-punc- 

 tatis, lateribus ubique arcuatis ; pygidio subtiliter rugoso, longe 

 fulvo-hirto ; pedibus piceis, f ulvo-setosis, tibiis anticis acute 

 tridentatis. 



Long. 14'5-17'5 mm. 



Hah. Bihe, Garengaiize. 



This form is identical in its general appearance with 

 T). [Ligyromorphus) rujiventris, Arrow, inhabiting Mashona- 

 land, but close examination reveals differences which are very- 

 slight but sufficient for their separation. The most easilv 

 recognizable is in the armature of the front tibia?, wliich is 

 alike in the two sexes, but constantly differs in the Eastern 

 and Western forms. In D. rujiventris there are two broad 

 and very blunt teeth, and a third is scarcely indicated. In 

 v. tridens there are three well-developed teeth, and all are 

 acutely pointed. The sculpture of the upper surface is rather 

 less rugose in the Angola species. The punctures upon the 

 pronotum are coarse and very dense, but are mostly distinct, 

 not completely coalescing as in the Eastern species, and the 

 sculpturing of the elytra is correspondingly rather less indefi- 

 nite and rugose, producing a rather more shining appearance. 



I described this genus as new in lUOl, having overlooked 

 the previous existence of Diploa, which was placed by its 

 author, Herr Kolbe, in a different subfamily to the genus 

 Myoderma. with which it is undoubtedly nearly related. I 

 have not seen Diplua proles^ Kolbe, but that insect has a 

 bidentate front tibia, and is no doubt very closely allied to 

 D. rujiventris, and possibly identical. 



The genus Xiphoscelis no doubt has some affinity to these 

 forms and should be placed in the Trichiinaj. 



XX. — Descriptions of new MdmmaJs from Mount Ruwenzori. 

 By Oldfield Thomas. 



The first collection sent home by the members of the 

 Ruwenzori Expedition contains examples of the following 

 new sjieciesand subspecies. All were collected on Ruwenzori 

 East, at altitudes from 6000' to lo,00(>'. 



