3&o Records of the Indian Museum. [Vol. XXIV, 



The female of H. nietneri has not been described. In this sex 

 the colouring of the head is, as in the male, largely black, with a 

 pair of yellow spots at the base of the upper lip, the bases of the 

 mandibles marked with yellow, and a yellow line across the frons 

 from eye to eye. The frons, as in Macrogomphus, is flattened so 

 that there is not the usual distinction between a vertical and a hori- 

 zontal part. Behind the ocelli the vertex bears a pair of small 

 conical tubercles. The occiput is depressed. 



The prothorax has the yellow markings more extensive than in 

 the male. 



The synthorax has a small superior juxta-humeral spot not 

 found in the mature male, in addition to the dorsal band, other- 

 wise as in the male. 



Abdomen. First segment entirely yellow, the remainder black, 

 marked with yellow as follows : — Dorsum of 2-8 with longitudinal 

 band, broader on the second segment than on the others, and from 

 2-7 occupying the whole length of the segment, on 8 only the 

 basal third. A broad lateral band, including the well-developed 

 auricles, along the second segment, a narrower and partly inter- 

 rupted band on the third. Basal triangular spots on 4-7. Anal 

 appendages whitish-yellow. Tenth segment extremely reduced 

 (? shrivelled) not one-quarter the length of the ninth. Vulvar 

 scale small, about one-third the length of the ninth segment, 

 shaped like a truncated triangle, only slightly bifid. 



Length of hinder-wing of a>28 mm., of abdomen 29-}- 1 mm. ; 

 length of hinder-wing of 2 31 mm., of abdomen 32 mm. 



Genus Microgomphus Selys. 



Genotype : M. chelifer Selys. 



Species examined : M. iorquatus (Selys). 



No basal antenodal nervure of 2nd series. Only one row of cells 

 between Cu 2 and the hinder margin of the fore-wing. Only one row 

 of cells between M t and M la at level of distal end of ptero- 

 stigma. Proximal angle of triangle of fore-wing as far distant 

 from the arculus as the length of the proximal side of the sub- 

 triangle. Sectors of arculus approximated after their origin. 

 Forking of M^ and M 3 unsymmetrical in fore and hinder-wings. 

 Pterostigma unbraced or feebly braced. Upper anal appendages 

 of male chelate. Vesicle of penis large, ninth segment of abdo- 

 men shorter than eighth. Size small, colouring brilliant. 



In this definition there is little to separate Microgomphus 

 from Heliogomphus, and I think the two genera are related. 

 Microgomphus differs mainly in its smaller size, more reduced vena- 

 tion, chelate upper anal appendages of the male, and in its richer 

 colouring. 



Microgomphus torquatus (Selys). 



Cyclogoniphits torquatus, Selys, Mon. Cow ph. 

 7 & (?, 4? $. Poona. K. C. leaser. 



