70 Mr. S. Maulik on Variation in the Prothoracic 



Fig. 3. Upper surface nf the three molar teeth. The oblique valleys 



between the cusps are shaded. 

 Fig. 4. The three transverse roots of the hindmost molar. 

 /'///. 5. The outer side of the middle tooth, with the front cusp (a) and 



hind cusp (b). 

 Fig. 6. The inner side of the middle tooth, with the front cusp (a) and 



hind cusp (b). 

 Fig. 7. The two middle cusps (a and b) of the middle tooth seen from 



inner side and partly from above. 



X. — Variation in the Prothoracic Spines of Dactylispa 

 xanthopus, Gestro. By S. MAULIK, B.A. (Cantab.), F.E.S. 



In the ' Terrrieszetrajzi Fuzetek,' vol. xxi. 1898, p. 262, 

 Dr. Gestro described this species from one example which 

 now exists as the type in the National Museum at Budapest. 

 This particular individual was taken at Darjeeling. In 

 examining the collection of Hispinse belonging to the Indian 

 Museum, Calcutta, I have come across a group of seventeen 

 examples collected by Atkinson at Jalapahar, Darjeeling. 

 They were all mounted on one card. Among this lot I find 

 one example that answers Dr. Gestro's description well — 

 viz., the insect is black and shining, the abdominal segments 

 and the legs are yellow, the colour of the basal five joints of 

 the antenna; is different from that of the remaining apical 

 joints, each side of the prothorax has a group of three spines 

 which may be regarded as having a common base. The front 

 margin has a pair of double spines. The other examples of 

 the same lot before me agree with the description in the 

 main — viz., the general form of the insect, the coloration 

 (black, with the abdominal segments, antenna;, legs, and 

 mouth-parts yellow), but differ in the following structures : — 



(1) On the front margin of the prothorax there are a pair 



of triple spines instead of double. 



(2) On each side of the prothorax there is a group of four 



spines instead of three. The latter are arranged in 

 tw r o ways — in some specimens the four spines have a 

 common base, in others the fourth may be regarded 

 as standing separate. 



In a note published in the ' Annales Musei Nationales 

 Hungariei,' 1U07, p. 72, Dr. Gestro identifies the examples 



