384 Records of the Indian Museum. [Vol. XXIV, 



appendages of male rather like those of Gomphus, s. sir. Ninth seg- 

 ment of abdomen shorter than eighth. Legs short, hindermost 

 femora when adpressed barely reaching the end of the first ab- 

 dominal segment ; armed with a number of very small tubercles on 

 the ventral surface, not arranged in definite rows. Vulvar scale of 

 female small, deeply cleft. 



I have found it difficult to make up my mind as to the 

 proper place of this genus. The character of the cross-nerves 

 between M,_ 3 and M 4 shows a certain amount of variability even 

 on the different wings of a single specimen. In some cases there 

 is distinct evidence of a spacing out of the cross-nerves, sug- 

 gesting an approach to the condition found in the Gomphus series ; 

 in other wings there is no evidence of anything of the sort. So 

 that it would, it seems to me, be reasonable to regard this form as 

 a primitive member of the Gomphus series, or as an Epigomphine 

 showing a tendency to specialization in the same direction as the 

 Gomphus series. The presence of two or even sometimes three 

 cross-nerves in the submedian space, the frequent existence of a 

 cross-nerve in the triangle of the hinder-wing of the female are 

 characters that incline me to think the position of the genus 

 should be rather with the Epigomphines. The colouring and so 

 far as I know the other characters of Perissogomphus, do not 

 lend any assistance in settling the question. On the whole I be- 

 lieve the genus is an annectant one and that it will ultimately 

 prove to occupy a position not far from the base of both series. 



Another oriental genus, Merogomphus Martin, known from 

 a single species from Tonkin, seems to me to be, like Perissogom- 

 phus, intermediate between ~the series Epigomphus and the series 

 Gomphus. It has fore- wings similar to those of the former series, 

 hinder- wings with the differentiation of cross- veins characterizing 

 the latter. The pterostigma is well braced. The anal appendages 

 of the male closely resemble those of Heliogomphus. The posi- 

 tion of the genus must be regarded as doubtful at present. 



Perissogomphus stevensi, sp. nov. 



id 1 , 4 2 $. Gopaldhara, Darjiling District. 



2§>? (fragmentary). Darjiling (cc/1060-cc/i 061). 



Male. Head. Lower lip black, upper lip, ante- and post- 

 clypeus brownish-black. Bases of mandibles yellow. Frons 

 pale yellow. Occiput and vertex black, the former with a straight 

 margin, edged with long hairs. 



Prothorax black, with a fine yellow spot on its posterior 

 margin, in the middle line. 



Synthorax yellowish-brown, with a large M -shaped black mark 

 anteriorly. The outer lines of the ft/| run down along the humeral 

 suture on either side from the ante-alar sinuses. The middle part 

 is made up of a median black line running down from the sinuses 

 on either side of the mid-dorsal carina, but not quite reaching 

 the meso thoracic ridge. The carina itself is yellowish-brown. 



