On new Longicorn Coleo^tera. 47 



VI. — Descriptions of new Longicorn Coleoptera (Prionidfe 

 and Lepturidge) from Madagascar. By Chakles 0. 



Watekhouse. 



Prionidse. 



Macrotoma gracilicornis^ n. sp. 



Elongata, parallela, angusta, brimnea, opaca ; capite thoraceque 

 rugosis, elyti'is dense grauulatis, antenuis gracilibus parce punc- 

 tatis, tibiis baud spinosis. cS . 



Long. 14 liu. 



Tliis is an elongate, narrow, light-brown species. An- 

 tennas slender, scarcely reaching to the apex of the elytra ; 

 the basal joint thick, strongly and closely punctured ; the 

 third joint very long, as long as the fourth, fifth, and nearly 

 half the sixth joints together, nearly cylindrical, sparingly 

 punctured above, more closely at the side ; the fourth to eighth 

 joints sparingly punctured ; the apex of the ninth and all the 

 tenth and eleventh joints opaque and longitudinally finely 

 striate ; the eleventh joint is as long as the tenth and two 

 thirds of the ninth together, it gradually becomes wider to 

 rather beyond the middle, and then narrows to the apex and 

 is unusually acuminate. The head is coarsely rugose, the 

 eyes widely se]:iarated. Thorax closely and coarsely rugose, 

 one third broader than long, moderately convex (with a short 

 slight impression in the middle of the base), slightly nar- 

 rowed anteriorly, the sides very gently arcuate and with the 

 rugosities appearing like irregular crenulations ; the posterior 

 angles furnished with an acute conical short tooth directed 

 outwards and backwards. Elytra sub])arallel, thickly beset 

 with minute slightly shining granules, more distinctly so at 

 the base than at the apex ,• convex at the base, very slightly 

 impressed between the shoulder and the scutellum ; the apical 

 angle with a small acute tooth. Anterior femora moderately 

 asperate, but the asperities are not acute ; the tibiae sparingly 

 punctured, the punctures closer along the margins. Inter- 

 mediate legs smoother. Posterior femora sparingly punc- 

 tured, with a few small acute asperities below; the tibise 

 sparingly and finely punctured. Sterna fuscous. Abdomen 

 ferruginous, with dusky margins to the segments, the apical 

 segment scarcely emarginate. 



Hah. Madagascar, Fianarantsoa. 



The form of the apical joint of the antennae and the 

 scarcely emarginate apical segment of the abdomen will be 

 found useful characters in distinguishing this species. 



