( 1-18) 



Length, 13—15 mm.; elytra, 9—11 mm.; broadtli, 4—5 mm. 

 ILib. Benito, Freucli Congo. 

 Two c?cJ,foni' ? ?. 



37. Monochamus isochrous spec. nov. 



6 ?. Brown, covered with a very dense tomentnm of an olivaceous raw-umber 

 colour, which is rather jialer below and at sides of prothorax than above ; longer 

 pubescence of tibiae and the soles silky ochraceous ; a thin basal mesial line on 

 pronotum iind the scutelhim cream-colour ; the scntellura especially conspicuous ; 

 no otlier markings. 



Head with a very deep mesial sulcus from clyjieus to pronotum ; frons 

 irregular, bearing au additional longitudinal groove between middle and eye, no 

 jmcpturation; antennal tubercles large, somewhat rngose, with a longitudinal groove 

 at bai-e on inner surface, the interanteunal depression not appearing triangular but 

 (piadrangnlar, which is esjjccially obvious in a view from behind ; on occij)nt an 

 obliciue submesial groove behind upper lobe of eye, no punctures except a few on 

 the fold limited by this groove. Antenna of c? half as long again as, of ? a little 

 longer tliau, the body ; third segment as long as, or shorter than, i)rothorax. The 

 latter broader than long ; side-s])ine large and acute ; snbapical transverse groove 

 deep, curving backwards in middle ; immediately behind it a trapezoidal depression, 

 bordered laterally by a flat tubercle, which is sharply limited behind by a groove 

 that extends indistinctly to basal constriction ; a few small punctures on side-spine 

 and posteriorly at sides of disc. Scntellum evenly rounded. Elytra irregnhirly 

 depressed in several places, each rounded at apex, minutely and dispersedly punctured 

 from base to beyond middle, then smooth, feebly but distinctly granulose behind 

 shoulders. Underside not punctured except at apices of tibiae ; sliort flat grey 

 hairs, which are longer than the hairs composing the briglit umber-brown pubes- 

 cence, dispersed over legs and underside of body; intercoxal processes of pro- and 

 mesosternum sulcate. 



Length, 28 mm.; elytra, 19 mm. ; breadth, 9 mm. 



Hah. Abetifi, Aslianti {tjjpe), and Portuguese (Jongo. 



One (?, two ¥ ?. 



The structure of the frons and antennal tubercles distinguishes this species 

 from all the other African Monochamus. 



38. Monochamus homoeus si)ec. nov. 



(J?. Close to the preceding, but head normal. Pubescence slightly brighter, 

 esjiecially at sides of prothorax and on underside ; bristles at apices of tibiae more 

 or less tawny ; scutellum centrally of the ground-colour, marginally ochraceous. 



Frons with thin mesial groove, no lateral grooves, antennal tubercles normal, 

 smc}oth, but the busal grooves found in isochrous indicated behind in Jiomoeus. 

 Third antennal segment slightly longer, and subapical sulcus of pronotum not so 

 deep mesially ; elytra more even, less undulate, dispersedly punctured from base to 

 apex, the punctures minute behind, larger than in isochrous at base, their anterior 

 edges not raised to distinct granules laterally behind shoulder. 



Antenna one-fifth (cJ) or very little (?) longer than the body. Prosternal 

 l)roces8 very feebly sulcate. 



Length, 23 — 27 mm. ; elytra, 16—19 mm. ; breadth, 7 — 9 mm. 



