On new Species of the Coleopterous Genus O'ides. 453 



L. — Descriptions of neto Species of the Coleopterous Genus 

 Oides (Gralerucidse). By C. J. Gahan, M.A., British 

 Museum (Natural History). 



In the course of arranging the species of O'ides in the British 

 Museum collection, some apparently new forms have come 

 under my notice. These are described in the present paper. 

 One of them (0. assimilis) is exceptional with regard to the 

 characters of the epipleura of the elytra. 



Chapuis, in his characterization of the genus, has not men- 

 tioned any sexual differences. I have noticed that in the 

 male the last ventral abdominal segment is emarginate or 

 notched on each side at the apex, and that the median lobe 

 thus cut off is usually bent inwards (or upwards). In the 

 female the apical margin of the last ventral segment is gene- 

 rally entire, but is sometimes feebly emarginate or sinuate in 

 the middle. 



Oides bivittata, sp. n. 



Ovata, testaceo-flava ; capite supra lougitudinaliter lineatim impresso, 

 inter oculos transversim impresso ; prothorace quam longiori plus 

 duplo latiori, sat dense punctulato, disco antice transversim de- 

 presso ; elytris dense tenuiter punctulatis, singulis vitta lata 

 submarginali piceo-nigra, basi et apice angustiore ; antennis sub- 

 gracilibus, articulis tribus vel quatuor basalibus flavis, ceteris 

 fuscis, articulo tertio quarto sequali. 



Long. 8-9 a mm. 



Hob. Celebes? {Baly Coll.), Aru Islands {Wallace). 



This species is nearly allied to 0. Clarkii, Jac. It may 

 be distinguished from the latter by the absence of a dark 

 sutural band from tlie elytra and by its having a single vitta 

 on each side. In those specimens of Clarkii that I have seen 

 the third joint of the antennae is rather shorter than the 

 fourth ; in the present species the third joint is quite equal 

 in length to the fourth, The species has a superficial resem- 

 blance to 0. linteata, Blanch., to which it was referred by 

 Mr. Baly. It may be very easily distinguished from that 

 species by its much slenderer antennas. 



Oides yuadrivittata, sp. n. 



Brcviter ovata, fiava ; antennis (basi excepta) fuscis ; elytris singulis 

 vittis duabus nigris — una submarginali, altera prope suturam 

 apicem non attingente ; metasterno piceo ; prothorace quam lon- 



Ann. & Mag. N. Hist. Ser. 6. Vol. vii. 31 



