1891] 231 



is very brief, he only says that tlie thoriix is marked by four stripes, stating nothing 

 as to their width. Schiner is the only author who clearly defines the difference 

 between the two species, and as I have specnncns whieli eorrespond to his descrip- 

 tions I shall follow them. 



N. KUDis, Flu. ?, Mgn., Zett. et Sclui. 

 P. consohrina, E,nd. 

 Thorax marked by four narrow black stripes, which are equal in width and 

 placed at equal distances from each other ; external dorso-central thoracic bristles 

 three in number behind the transverse groove ; eyes in the male separated by an 

 interval occupying about one-fifth of the width of the head, those of the female not 

 much wider apart; antenna? black, tinged with red at the junction of the second 

 and third joints, which colour is more marked in the female than in the male ; 

 palpi yellow ; seutellum more or less rufous towards the apex ; abdomen black, sides 

 red in the male, and marked by grey tessellations in both sexes ; wings with the 

 apical cross veins much curved, the outer cross vein a little sinuous, and the little 

 cross veins rather nebulous. Not uncommon. 



N. CONSOBRINA, Mgn. ?, Sch. non End. [2321 



Thorax striped in front by four wide black bands, the central pair of wliich are °'' ' * 

 placed near together ; posterior outer dorso-central bristles three in number ; an- 

 tennae black ; palpi yellow ; seutellum black ; abdomen as in N. rudis ; wings with 

 the apical cross vein rather oblique, and less curved than in N. rudis ; the outer 

 cross vein sinuous, and the little cross vein almost clear. Rare. 



N. IIADICUM, F. 



This, the most common species in the genus, has the antennae and palpi black, 

 the latter being sometimes pale or red at the ends ; the eyes are separated by nearly 

 an equal interval in both sexes ; the thorax has four rather narrow stripes, and three 

 external dorso-central bristles behind the transverse groove or suture ; the seutellum 

 has the apex mostly red ; the abdomen is shiny black, with two well defined broad 

 transverse bands, and has the sides red, and somewhat diaphanous in the males ; 

 the wings are tinged with brown, and have the veins, especially the little cross ones, 

 rather nebulous, and the apical cross veins much curved. Generally distributed. 



N. C^SIA, Fin. 



This closely resembles N. radicum, but is quite distinct ; the thoracic stripes 

 are wider ; there are four instead of three external dorso-centi-al bristles behind the 

 suture ; the third antennal joint is shorter, being scarcely as long as the second ; 

 the abdomen has the sides irregularly tcssellalcd with white, instead of being 

 encircled with white bands ; the wings arc clearer, the little cross veins are un- 

 clouded, and the apical cross veins are more oblique and less curved. Very rare; I 

 have only seen one British specimen, which was in the late F. Walker's collection. 



N. INTERMEDIA, Ztt. 



setosa ?, Mcq. 

 This species is of a bright blue-black colour, with a convex subcylindrical 



