1886.] 55 



The sides of the sternal plates and basal ventral segments are more or 

 less coarsely punctured. M. obscurus, Chaudoir, which belongs to the 

 same sub-group of the genus, is distinguished by the black basal 

 joints of the antennas, and a puncture at the apex of the first elytral 

 interstice; 11. jylaiyderus {dinoiher allied species) by the truncated 

 base of the elytra and the hind angles of the thorax indicated by an 

 obtuse dentiform prominence. Both M. sculptilis and J/, excisus are 

 distinguished by the remarkably deep sub-apical sinuation of the elytra, 

 the anterior angle of the sinuation, though rounded, being prominent 

 and conspicuous, and also by the large circular, sometimes umbilicated, 

 punctures of the third elytral interstice. 



Megalonychus sWAHiLius, sp. n. — M. rugicolli ajfflnis, sed multo gra- 

 cilior : piceo-niger, pa/pis antennis basi pedibusque piceo-fiilvis (trochanteribus 

 palUdioribus) : thorace angustiori et postice magis angustato angulis posticis 

 obtusissimis sed distinctis margineque ante avgulum leviter sinuato, punctato- 

 rugoso disco fere Icevi : elytris sat anguste ob/ongis, apice oblique et mediomter 

 sinuatis, angulo suturali hated dentato, matyine basali utrinque angulatim 

 sinuato, striis acute incisis crebre crenato-punrtiilatis, i?iterstitiis fere planis, 

 subtiliter alutaccis (S) sed sericeo-nitidis,'6^o btpunctato : prosterno Iwvimeso- 

 et metasternis extus disperse punctul atis . Long., 11 mm., $ . 



Mamboia {Mr. Last). 



Sub-fam. PTEBOSTICRINjE. 



Abacbtus Wakefieldi, sp. n. — Ad. Sect., I, 2, A, b, Chaud. Monogr., 

 pertinet. Magnus, piceo-niger nitidus ; thorace impunctato subrotundato 

 antice et postice fere cequaliter angustato, margine laterali incrassato valde 

 reflexo intus sulco marginato, sulcis basalibus profundis ; elytris oblongis 

 simpliciter sat profunde striatis interstitiis parum convexis ; co7'pore subtus 

 impunctato. Long., 15 mm., <? ? . 



Eibe, near Mombasa {Mr. Wahejleld) . 



The sub-group of Chaudoir' s Monograph of Abacetm, to which 

 this species belongs, contains those species in which the four hinder 

 tarsi are pluri-sulcate, the front tibial spurs and male fore femora 

 simple, and the thorax rounded on the sides. In the present species 

 the sides of the thorax describe an arc, from the anterior to the pos- 

 terior angles, but the latter are distinct though obtuse. In its widest 

 part the thorax is scarcely narrower than the elytra, and its lateral 

 margins form a rim which becomes broader as it approaches the hind 

 angles, and is separated from the disc of the thorax by a broad groove 

 (not widened near the base), separated from the disc by a faint fold, 

 which is continued, at an angle, along the base of the thorax on each 



