( 147 ) 



transverse snbajiical sulcus; globosities ill defiued, except the mesial one. Scntellnm 

 ronnded. Elytra quite straight at base, with the shoulders acute, prominent, but not 

 projecting forward ; almost gradually narrowing from shoulders to near apex, 

 punctured from base to near apex, shoulders granulose ; an inconspicuous short basal 

 snbmesial carina ending iu a tooth-like tubercle ; apex rounded. Femora without 

 large punctures. Hairs at end of abdomen aud at apices of tibiae ochraceous. 



Length, 19 mm. ; elytra, 13 mm. ; breadth, 8J mm. 



Hab. Batanga, Cameroons (tijpe), and Benito, French Congo. 



One jmir. 



3.5. Monochamus melaleuca spec. nov. 



c?. Closely allied to omias, but very different in pattern and iu the structure of 

 the head and prothorax. 



Black. Frons, cheek, a mesial vitta on occiput, a broader one on pronotum, sides 

 of thorax (excepting spine aud a patch below it), scutellum, numerous more or less 

 confluent spots ou elytra, and sides of under surface, white ; legs and scape of 

 antenna grey, being thinly pubescent. 



Head and pronotum scarcely with any punctures. Frons slightly convex, 

 mesial line thin but distinct ; lower lobe of e}'e little over half the width of the 

 cheek. Antenna three times the length of the body ; scape thicker than in omias, 

 rather finely punctured. Pronotum without distinct dorsal tubercles and grooves ; 

 lateral spine very broad at base, but short. Scutellum rounded. Elytra as in 

 omias, the punctures more regularly seriate near suture. Femora without 

 punctures. 



Length, 15 mm. ; elytra, 10 mm. ; breadth, 5 mm. 



Hob. Benito, French Congo. 



Two $S. 



The hind femora reach to near end of abdomen in omias and melaleuca, and 

 the apices of the elytra are almost rounded together. 



36. Monochamus distigma spec. nov. 



$ ?. Brown-black, tibiae, abdomen and antenna rufescent in some specimens ; 

 underside evenly pubescent, clayish olive ; upperside tawny-olive, indistinctly 

 irrorated with brown, the tawny-olive pubescence interrupted by the large punctures. 

 Scutellum buif. A velvety black discal postmedian spot on each elytrum, 

 irregularly transverse or ovate, seldom only vest'.gial. 



Head punctured all over, the punctures large and deep, but not very close 

 together ; frons with faintly raised mesial line. Lower lobe of eye not so wide as 

 cheek. Antenna of (J three times the length of the body, of ? half as long again 

 as the body ; scape short, with small punctures ; segments 3 to 11 grey at bases in 

 ? . Prothorax with large punctures all over the upperside, except the feeble discal 

 callosities, and also on the underside beneath the side-spine ; as long as basally 

 broad ; no distinct subapical sulcus above, no distinctly limited mesial impression ; 

 antebasal mesial callosity feebly impressed. Elytra with rectangular, very slightly 

 receding shoulders, coarsely punctured from base to apex, conspicuously granulate 

 at base, the granules highest on the somewhat raised mesial part of base ; apex 

 truncate, with the angles rounded. Mesosternal episternum with some large 

 punctures. Femora not piuictnred. 



11 



