Longicorn Genus Glenea, Newm. 477 



clifFerences are observable in three of the species. The males 

 of G. grisea are somewhat larger than the others, just as the 

 females are also larger. In the males of G. falvomaculata 

 the deflexed sides of the eljtra are not pubescent like the 

 dorsal surface, but, being naked, lay bare the metallic-blue 

 colour of the derm. This character, however, is uncertain, 

 as it maj possibly have been due to rubbing. In the males 

 of arouensis the pronotum exhibits four faint black marks — 

 two near the anterior border and two at the base — in 

 positions exactly corresponding to those occupied by the 

 distinct black marks on the pronotum of the females. 



The next example of sexual dimorphism to which I wish 

 to direct attention is furnished by Glenea viridipustidata., 

 Thoms. The female is black, with two bands on the top of 

 the head^ three on the prothorax, the posterior half of the 

 elytral suture, the apex, and five spots on each elytron, all of 

 a bright silvery-green colour ; and the tip of the third 

 antennal joint is of a bluish-green colour. The male, 

 described by Thomson as a distinct species under the name 

 of G. conjusa, Th., is scarcely to be distinguished from the 

 male of G. venusta, Gu^r. It differs from the female of 

 viridipustulata in having the antennai entirely black, and 

 the whole of the elytral suture bordered with green, while, 

 instead of five spots on each elytron, there is a long dorso- 

 lateral green vitta, and a short mid-dorsal vitta, near the end 

 of which is placed a green spot. In the males the femora 

 are as a rule yellowish testaceous in colour ; but females also 

 occur (these have been described by Thomson as a distinct 

 species — G. sparsa, Th.) in which the femora are entirely 

 testaceous. 



The female of G. venusta, Guer., is described by Pascoe 

 under the name of G. viridinotata, Blanch. It differs but 

 slightly in markings from the male ; the third antennal joint 

 is circled with blue at the tip, and the green sutural vitta of 

 the elytra does not extend to the base. Here again we 

 seem to have as a result of evolution a clear differentiation in 

 the markings of the females of two species, while the males 

 have remained almost exactly alike. I must confess that in 

 separating the males of the two species — G. viridipustulata^ 

 Thoms., and G. venusta, Guer. — I have been guided chiefly 

 by the locality of the specimens, and not by any observed 

 differences in their structure or marking. The s[>ecimeiis of 

 the first species in the British Museum collection, including 

 both males and females, are from the islands Batchian, 

 Kaioa, Gilolo, and Morty ; those of the second from the 

 Aru and Ke Is., Dorey, Mysol, Waigiou, and Solomon Is. 



