260 HYMENOPTEKA. 



Mesonotal sutures indistinct. Pleural sutures black. First abdominal segment longish, 

 narrow, shining, impunctate ; the other segments finely punctured. The abdomen is 

 longish and rather narrow. Coxae punctured. Areolet 5-angular, the lower side sharply 

 angled, the latter nervures converging at the top, the outer nervure moderately distinct. 

 There is a distinct curved smoky cloud at the stigma, and a fainter and narrower one at 

 the basal nervure, and the apex is also clouded. 



Subfam. PIMPLINSE. 



So far as our present knowledge goes, this subfamily is not very numerously represented 

 in Central America ; although, on the other hand, one or two species of " Pimplinse " 

 appear to be the commonest of all the Ichneumons in that country. Some of the species 

 are difficult of generic location, owing to the characters on which genera have hitherto 

 been grounded varying in such a way as to lead one to conclude that such characters 

 (e. g. the form of the abdomen) cannot be looked upon as of higher than specific rank. 



KHYSSA. 



Rhyssa, Gravenhorst, Ichn. Europ. iii. p. 260. 



This genus contains the largest species of Pimplinse. Our two species have the 

 apex of the clypeus truncated, not produced in the middle, and consequently agree with 

 Thalessa, Holmgren ; but they have also the abdominal segments not incised, and thus 

 differ from the latter. Species of the genus (which, considering its wide distribution, 

 is not a large one) are found in most parts of the world, including New Zealand. 



1. Rhyssa nigritarsis. (Tab. XL fig. 3, $ .) 



Fulvo-testacea ; antennis, mesonoto (medio excepto), linea metanoti, abdomine supra tarsisque, nigris ; alis 



hyalinis, apice fumato. $ . 

 Long. 22 mi'llim. 



Hab. Panama, Volcan de Chiriqui 2000 to 4000 feet (Champion). 



Antennae nearly as long as the body, stout, gradually thickened towards the apex ; 

 the base testaceous on the lower side. Head, if anything, broader than the mesothorax, 

 the face strongly punctured, the clypeus obscurely transversely striated ; with two deep 

 shining black depressions above the antennae, separated by a thin, rather sharp, parti- 

 tion ; vertex punctured in front laterally, behind the ocelli aciculated ; mandibles black 

 at the apex. Pronotum reaching to near the top of the head, rising rather perpendi- 

 cularly in front ; the mesonotum projects a little over it, and rises from the scutellum 

 to the apex, which has a distinct margin; the margin projects upwards in the centre, 

 and is depressed in the middle. Mesonotum transversely striated as usual, and with a 

 longitudinal furrow on each side on the apical three fourths ; scutellum shining, obscurely 



