418 Records of the Indian Museum. [Voi,. XXIV, 



Anal appendages yellow. Vulvar scale very small, cleft to 

 its base. 



This species is probably the smallest Gomphine known and is 

 smaller than any individual M. torquatus which I have examined. 



Perissogomphus stevensi Laid. 



I have received several specimens of this species from Darjil- 

 ing and Assam and from an examination of the venation, am able 

 to add the following to the generic characters : — 



(i) Usually I but sometimes 2 rows of cells between M{ and 



M i a at the level of the distal end of stigma. 

 (ii) Triangles of both fore and hindwings of female and also 



hindwings of male frequently traversed by a nervure. 

 Concerning the species, whilst the majority of those received 

 have the ground colour yellowish brown, some specimens are a 

 bright greenish yellow and I am satisfied that the former colour 

 is the effect of decomposition and the latter the true colour 

 during life. 



Davidius sp. 

 A single female from Gopaldhara, Assam, coll. H. Stevens. 



Abdomen 34 mm. Hindwing 32 mm. 



Head glossy black, the bases of mandibles, 2 spots at the base 

 of the labrum and a stripe across the frons citron yellow. Occiput 

 greatly depressed at its centre. 



Prothorax black with a small median spot on the posterior 

 lobe, a geminate spot in front of it, the anterior border and a small 

 spot on each side citron yellow. 



Thorax black on the dorsum marked with a dorsal stripe 

 parallel to the dorsal carina and connected with an interrupted 

 mesothoracic collar ; a triangular spot above and to the outer side 

 of the dorsal stripe; a fine, humeral line separated from the spot, 

 the long axis of the latter being at right angles to it. The sides 

 citron yellow with narrow black stiipes on the lateral sutures. 

 Spots of yellow on tergum and at bases of wings. 



I*egs long and slim, black, the anterior femora yellow out- 

 wardly, the hind with a row of very long, robust, widely separated 

 spines, 6 in number, mid femora with a row of closely set, short 

 spines and a single long one at the distal end. 



Abdomen black, marked with yellow as follows : a triangular, 

 apical spot on segment 1, the base of the triangle at the apex of 

 the segment, 2 with a bilobed spot on its middorsum, 3 to 7 and 

 base of 8th with a fine, middorsal stripe, segments 1 to 3 broadly 

 yellow at the sides. 



Anal appendages small, conical, yellow. 



Wings as for type, triangles of hindwings crossed, the left 

 forewing has 2 basal antenodal nervures of the second series (a 

 very rare occurrence), the other wings with one each. 



