434 ^Ir. G. J. Arrow on new 



pointed ; front tibia3 simple and unarmed in the male, biden- 

 tate in the female ; iiind tibise of the male strongly curved, 

 with a thick fringe at the inner edge of the posterior part; 

 those of the female simple. 



I omitted to include in my description on p. 350 any reference 

 to the sexes of the new species Macronota gracilis. This is a 

 form allied to M. antennata, Wallace, and was described 

 from a specimen of each sex. These differ very little, but 

 the male has the prothorax rather narrower than that of the 

 female, and the basal lobe more pronounced, and the front 

 tibire are rather slenderer and their teeth more equal. 



The sexes in this genus often differ considerably both in 

 form and colouring, and have in several cases been described 

 as different species. I am not aware that it has yet been 

 recorded that J/acronota scalplicolUs, Thorns., is the female 

 cf M. '^-vittata, Schaum, although the insect is common in 

 Ceylon and the fact has long been recognized. Still more 

 dissimilar are the sexes of M. Oherthuri, Lansb., of which 

 M. humilis^ Lansb., described at the same time and from the 

 same place, is the female. I have seen the two forms 

 together in various collections, the male being silky black 

 with white markings, and the female dull ashy brown. It is 

 not common, but I associate the two forms without any 

 hesitation because the closely-allied M. crucicollis, Lansb. 

 [=flavosparsa, Wat.), of which I have seen a large number, 

 has an exactly similar female. Li a work in preparation I 

 hope to give the sexual distinctions of all the Indian species 

 of this genus. 



Another genus in which marked differences between the 

 sexes occur, but have not hitherto been noticed, is Glycyphana^ 

 in which also several so-called species have to be eliminated 

 in consequence. In his description of G. hinolata, G. & P., 

 Burmeister noted that his examples were females, and all 

 that I have seen of that form are of the same sex. It occurs, 

 however, in conjunction with another form generally regarded 

 (perhaps wrongly) as G. torquata, F., and of this our 

 specimens are all males. The two differ only in their 

 coloration, the males having a row of four spots (instead of 

 only two) across the middle of the elytra, while the lateral 

 patches upon the pygidium are generally yellow instead of 

 blood-red. 



A still greater difference occurs between the two sexes of 

 G. recjcdis, VoU., o£ which the female {G. cekbensis. Wall.) 

 has the pygidium entirely black, while in the male it is 

 entirely orange, and the elytra have two large lateral patches 



