ON THE INSECTS FROM NEW BRITAIN. 387 



by Dr Wille}' from New Guinea, aud I will take this opportunity of briefly diagnosing 

 it'. The coloration of these insects is very unusual, exhibiting as it does the yellow 

 lines of the South-American Brenthides in a somewhat different form. From a taxo- 

 nomical point of view Cacotrachelus is of considerable interest, as it might almost as well 

 be placed amongst the S. American Brenthides as near Eutrachebis. 



Cacotrachelus sculptipennis, n. sp. Plate XXXV. Fig. 8 j/^ ; 8 a $ , head and thorax 

 from side. 



Nigricans, capite thoraceque metallescentibus, femoribus tibiisque flavo-rufis ; elytris 

 rufis, versus suturam piceis, interstitio tertio fere toto, 5° ad basin flavescentibus, crenato- 

 sulcatis; capite thoraceque canaliculatis, illo ad verticem profunde impresso. Long, cum 

 rostro, 8 mm. 



Male. Rostrum broad and short, not so long as the thorax, thicker at the tip, deeply 

 sulcate along the middle ; head elongate convex, canaliculate, the channel expanding 

 behind into a broad deep depression; separated from the neck by a very deep de- 

 pression ; the back of the head is somewhat depressed, and on each side with a small 

 notch or fovea. Antennae inserted in the middle of the rostrum, thick and short, 

 thicker towards the tip; joints 3 — 10 transverse, 9 and 10 distinctly longer than those 

 preceding them, 11th joint acuminate, rather longer than broad. Prothorax longer than 

 broad, rounded at the side and naiTowed in front, convex, impunctate, very distinctly 

 channelled behind, the channel finer in front, and not reaching the anterior margin. 

 Elytra but little prolonged behind, truncate at the tip, the outer angle slightly obtuse 

 and the lateral margin strongly raised behind ; externally deeply grooved, the gi-ooves 

 very regularly sculptured, the interstices narrow, the first and second striae are fine, 

 and the first, second and third interstices comparatively broad, the sixth interstice 

 is somewhat more prolonged and raised at the extreme base. The legs are short, 

 reddish-yellow, the trochanters and tarsi blackish, the knees a little darker; all the 

 legs provided with strong angular mucro at the tip of the tibia ; tibiae broad 

 compressed, but less so in the middle than at the base and apex. 



Female. Resembling the male, but with the rostrum slender, and only slightly 

 thicker at the tip, the antennae inserted near the base, and the tibial mucros obsolete. 



Ithystenus dehilis, n. sp. Plate XXXV. Fig. 9 ^. 



(/. Niger, opacus, femoribus parte basaii rufa, elytris flavo-lineatis, ad apicem acumi- 

 uibus duobus, brevibus, simplicibus ornatis. Long, cum rostro, 23 mm. 



Allied to the New Guineau /. linearis, but smaller, with the yellow lines of the 

 elytra extending nearly to the tip, and the apical processes, simple points, without lobe 

 or swelling at their bases. The hind tibiae are remarkably short, but the femora extend 



1 Cacotrachelus javamm n. sp. Picescens, pedibus ruBs, piceo-variegatis ; elytris regulariter crenato-sulcatis, 

 dorso deplauato, apice subprolongato, truncate; externe, suturaque nigricantibius, interstitio tertio flavo, latiore, 

 interstitiis 2" 4"iiue vage rufescentibus, 5" iterum llavoscontiore ; antennis crassiusculis, modice elongatis, 

 apicem versus latioribus, articulis ultimis tribus paulo latioribus; tibiis interinediis et poatcrionbus parte 

 supra medium crassiore. Long. <?, cum rostro, 13 mm. Hab. Willis mounttiins, .Java. 



