368 DR. G. A. K. MARSHALL ON THE SPECIES 



In spite of certain obvious diversities I liave preferred to retain 

 all the species here described within tlie genus Balaninus in its 

 broad sense. The ventral structure in B. hryanti and the sepa- 

 ration of the front coxa? in B. discreticoxis are notable departures 

 from the normal ; but in a group of which we admittedly know 

 extremely little, undue haste in erecting new genera on single 

 species is by no means desirable. 



The strong sinuation of the lateral margin of the elytra, which 

 has been used in the key for the primary division of the genus, 

 will no doubt be treated by some anthors as of generic value. 

 But in the writer's opinion it does not present the features of a 

 satisfactory generic character ; it is not correlated with any other 

 structural difference, and the two divisions created by it are no 

 more homogeneous among themselves than is the whole undivided 

 series. It seems not unlikely that this sinuation is in the nature 

 of a late adaptation ; for it will proba1)ly be found to be correlated 

 with a greater activity in flight, the cutting away of the elytral 

 margin allowing greater freedom in the use of .the membranous 

 wings. 



In the following descriptions no reference is made to the 

 scnlptui-ing of the elytra, except in B. glabncollis, because it is 

 practically similar in all the other species. In these the punctate 

 strife are deep and broad throughout, but narrower than the 

 intervals, which bear transverse granular rugosities, these being- 

 coarsest near the base and becoming gradually finer behind. 



I have pleasure in exjDressing my tlianks to Miss 0. F. Tassart 

 for the great care and trouble she has taken in the pi'eparation of 

 her excellent drawings. 



Mr. Bryant has now generously presented the whole of his fine 

 collection of Curculionida? to the British Museum, in which will 

 be found the tvpes of all the following species, unless otherwise 

 indicated. 



A Kpji to the Borneau tS'penes o/" Balaninus. 



1. (24.) Mavgo elytrorum Irtternlis in-ofniule simiatus supra metepi- 



sternum latissimum. 



2. (3.) Segmeiitum ventris secuiHluni aiigulo lateral! posteriore valde 



producto fere usque ad basin segiiienti c|uarti, segvaeiitis primo 

 et secuiido pone coxas brevissimis, siiiiul suiniitis ibi tertio noii 

 longioribus ; elytra nigra, tertia parte apicali testaeea ; S tibiis 

 posticis intus et feniorilnis anticis su'ntus longe fimbriatis, 

 tibiis anticis intiis dente lato armatis. 1. Iryanti, sp. n., $ 9 • 



3. (2.) Segmentum ventris secundum angulo laterali posteriore non aiit 



perparum producto; elytronim integumentuni concolor; S 

 pedibus simplicibus. 



4. (5.) Pronotuni laeve nitiduni, punctis parvis sejunctis ; articulus 



funiculi primus quatuor sequentibus simul sumptis fere 

 icqualis. 2. glahricollis, sp. n., $ . 



5. (4.) Pronotuni opacum, punctis maguis reticixlatim approximatis, 



nonnnmquam confluentibus ; articulus funiculi primus trilius 

 sequentibus simul sumptis brevior. 



6. (21.) Segmentum ventris primum pone coxas secundo non longius. 



7. (20.) Articulus funiculi primus secundo longior; prouotum regu- 



lariter reticulato-i3unctatum. 



