86 On a neiv Genus and Species o/Agrionidae. 



its origin, tlie principal sector rising from the subno'lal 

 five or six spaces further on, the nodal sector running from 

 the continuation of the nodal vein ; the median radius and 

 upper sector of the triangle of the usual form ; the nervure 

 closing the lower basal cell very irregular, it commences on 

 the lower sector of the arculus, curves down to the lower 

 extremity of the lower basal cell, and forms nearly a right 

 angle outwards, throwing off the upper sector of the triangle 

 at this point, and then curves inwards and downwards, turning 

 outwards again as it approaches the inner margin. All the 

 nervures are curved as they ajiproach the hind margins, and 

 between most of the principal nervures there are two long 

 accessory nervures, and between each of these again two 

 shorter ones as they approach the margins of the wing. 

 Within the curve of the nervure closing the lower basal cell 

 is a series of short semicircular accessory nervures on all the 

 wings, as in the African genus Sapho, which Archineura 

 perhaps most nearly resembles in neuration, though Sapho 

 differs essentially in having the basal cell untraversed, and the 

 pterostigma much shorter. 



ArcMneura hasilactea, sp. n. 

 Exp. al. 105 millini. ; long, pter, 5 millim. ; long. corp. 

 80 millim. 



Head and body metallic green, head and thorax with bra?sy 

 reflections above ; antenna?, legs, and anal appendages black. 

 Face and under surface of abdomen blackish ; a short white 

 line beneath each antenna ; septa white ; thorax white be- 

 neath, with a broad oblique black band; anal appendages 

 conspicuous, upper appendages about as long as the ninth 

 segment, curved inwards and downwards, and slightly thick- 

 ened beyond the middle, with five small teeth on the upper- 

 side ; lower appendages incurved, rather shorter, with one 

 or two very small teeth on the inside towards the tip, the 

 largest at the tip ; legs with spines of moderate length. 

 AVings yellowish hyaline, with rufous nervures; costal 

 nervure blackish ; costal area of a deeper yellow ; basal third 

 of all the wings below the }irincipnl radius sufluscd with 

 milky white. 



JJah. Foo Chow. 



Described from a single male spociuKii. 



Another interesting dragonfly in the same collection appears 

 to be the female of the rare Ji/n/ot/itmis spIenJida, Eamb. ; but 

 1 have not enough specimens to be positive. It does not 

 agree with the description of li. impcratru; Do JSclys, 

 described from " Loo Choo." 



