of the Subfamily iEschninai 411 



antenodals and 7 to 9 postnodals in the anterior and 10 or 11 

 and 8 to 10 in the posterior ; 5 (rarely 6) cellules in the 

 principal triangle in anterior and 4 (rarely 5) in posterior, 2 

 (rarely 1) in the inner triangle; 2 to 4 supra-trigonals, 3 or 4 

 in the median area ; anal triangle 3-celled. 



Length of abdomen [cum append.) 49 millitn. ; length of 

 posterior wing 44 millim., greatest breadth 14 millim. 



llab. Delagoa Bay, two males. 



This insect is clearly an Anaciceschna (distinct from A. jas- 

 jndea), but the lateral impressions on the sides of the abdo- 

 men are very faintly indicated *. 



Gynacantha f khasiaca, sp. n. 



<$ . Face dingy yellowish, almost fumose, a strongly defined 

 black T-spot on the top of the front, which is otherwise con- 

 spicuously pale (yellowish) ; occiput minute, blackish, its 

 margin raised; back of head yellowish, eye-margins blackish. 

 Thorax dark greenish above, dorsal crest black ; sides some- 

 what more yellowish, with indications of two narrow blackish 

 bands, one on the humeral suture, the other on the interalar 

 suture. Legs pitchy black ; anterior coxte and trochanters and 

 anterior femora internally brownish. Abdomen moderate, the 

 basal portion short and much inflated, considerably constricted 

 at the third segment ; oreilettes large, rounded, black, the edge 

 with five or six coarse teeth; general colour black above, 

 venter brownish on a portion of the third to seventh seg- 

 ments, the sides of segments 1 and 2 varied with greenish ; 

 tenth segment with a tine, slightly raised, longitudinal dorsal 

 carina not quite reaching the apical margin, which is finely 

 denticulate and slightly notched in the middle, the apical 

 portion of the segment transversely excavated, and at the 



* As a modification of Dr. Karsch's system I think it will prove 

 preferable to cause Anaciaschna to follow instead of precede Gynacantha 

 &C Probably undue importance has been placed on the presence of 

 lateral imp -essions on the abdomen, and I show that in the species above 

 described they are virtually absent. 



t Gynacantha is here applied in the sense indicated by de Selys in 

 1883. Mr. Kirby, in his Catalogue, retains the term for species placed 

 in Triacanthayyna by de Selys, and substitutes Acanthayyna for Gyna- 

 cantha. Dr. Karsch has objected to this on the ground that, according 

 to him, there was no necessity for de Selys's subdivisions. I think, how- 

 ever, that these subdivisions mil be maintained (and others probably be 

 found necessary;. My objection to the change made by Kirby is that 

 the type or types of Gynacantha and Triacanthygina were first indicated- 

 by de Selys when he subdivided the former in 1883 (Kirby's catalogue 

 was published in 1890) ; he indicated no type of Gynacantha in 1857, as 

 Kirby seems to imply. 



29* 



