274 Baron E. de Selys-Longchamps oti a ueio Genus of 



posterior lobe subtriangular, rounded. Abdomen slender, cylin- 

 drical, not constricted, becoming narrower from the base to the 

 extremity. Legs slender, ciliated. Anal appendices simple, 

 thrice the length of the tenth segment. 

 ? unknown. 



This species appears to me to belong to the genus Zygonyx, 

 of which the type {Z. Ida^ Selys) comes from Java, and has 

 the base of the second to the eighth segments encircled with 

 yellow. The analogy between the two species is very great, 

 and I think that affinity equally exists ; however, there are three 

 characters which cause me to hesitate as to its definite position : 

 Z. luctifera has a smaller head, it possesses only one nervule in 

 the median basal space, and the lower division of the tarsal 

 claws, although well marked, is shorter than the upper; the 

 equality of the two divisions of the claws is the character on 

 which I founded the genus Zygonyx. 



Z. Iris, Selys, from the Malayan archipelago, forms another 

 section, in Avhich the discoidal triangles are traversed by a 

 nervule, and the divisions of the claws are equal. This con- 

 stitutes the type of the genus, such as it has been adopted by 

 Herr Brauer. 



Genus Allolestes, De Selys, gen. nov. 



Pterostigma thick, oblong, surmounting two to three cellules. 

 Eeticulation rather dense ; the sectors curved near the base, 

 from the short sector [secteur href) to the ultranodal with 

 two supplementary sectors interposed between each. Wings 

 strongly petiolated (as far as the apex of the quadrilateral), the 

 postcostal basal nervule placed under the fii-st antecubital ; 

 quadi'ilateral very long (the upper side one-fourth shorter than 

 the lower), occupying all the space between the second ante- 

 cubital and the nodus ; a single cellule between the quadrila- 

 teral and the vein which descends from the nodus ; postcostal 

 space with a single row of cellules. 



Lower lip oblong, roundly emarginated in its final third, the 

 extremities distant. Antennae with the first joint very short, 

 the second one-half longer, the third slender, equalling the two 

 first united. 



Abdomen moderate, slightly longer than the inferior wings. 



Legs rather long, with long ciliations ; tarsal claws bifid. 



^ unknown ; ? with the tenth segment very short, the ninth 

 shorter than the eighth. 



This genus, which resembles Argiolestes by the pterostigma, 

 the lower lip, the claws, and the strongly pctiohited wings, 

 diftcrs from it by the postcostal space formed of a single row 

 of cellules, and by one supplementary sector less from the short 

 sector Ic tiic iillraiiodal. 



