216 [September, 1916. 



extend on to the middle third of the width of the segment, the 

 3rd segment with much smaller spots, still more widely separated, 

 only visible as minute lateral spots when the abdomen is viewed from 

 above; antennae unusually long and slender, the flagellum with a 

 sparse bvit very noticeable fringe of erect hairs behind, obviously 

 more developed than in any of the following. (Abdominal markings 

 identical with those of many $ N. ochrostoma) ...N. lateralis Sm. 



6 (5) Abdomen hardly ever coloured as above ; if somewhat similar, the 



antennae are shorter and the hair-fringe less developed. 



7 (8) 2nd abdominal segment with a wide unbroken yellow band ; the first 



black at base followed by a brown median band, which in front 

 is occupied by two yellow spots, forming a more or less interrupted 

 band ; propodeum with erect conspicuous, usually trilobate, yellow 

 maculae on either side of the middle ; mesonotal red lines not wide, 

 together not occupying half the area of the mesonotum... 



N. signata Panz. 



8 (7) 2nd abdominal segment rarely with an unbroken yellow band, this 



being usually interrupted, at least slightly, medially, and often 

 broken into two yellow spots ; if entire, the mesonotal lines are wide, 

 often confluent, or the propodeal markings are red, not largely yellow. 



9 (10) Average size larger, wings with notable yellowish tint, antennae 



with entirely pale flagellar joints, not even the more apical ones 

 appearing more or less darkened or brownish above. 



(Pubescence on each side of propodevim just above the 

 abdominal insertion and also that on the hind coxae flavescent in 

 fresh examples, not white or silvery) flava Panz. 



10 (9) Average size smaller, wings not distinctly yellowish, bvit i-ather 



greyish and usually with deeper inf uscations than in the above ; 

 flagellar joints often entirely brownish or suffused above (or in front) 

 or at least with some of the joints that precede the apical one 

 evidently darker above (or in front) than they are beneath (or 

 behind). 



(Pubescence on each side of propodeum nearly always white 

 or silvery as also that on the hind coxae) ruficornis L. 



Before tabulating the c? c? of the above, a few remarks on some 

 of these $ $ are necessary. 



For the separation of the diiferent forms I have chiefly relied on 

 colour distinctions, though I believe that most, if not all, are separable 

 by slight structural characters as well. But such slight differences as 

 are to be found in the thickness or length of the antennae, or of the 

 legs, or in the length or density of the pubescence of various parts, 

 are of little use in a table, which is intended to enable collectors to 



