156 [July. 



yellow bands are usually narrower (linear) and that on segment 4 

 entire in both sexes. Its surface is much duller (opaque ! ) and 

 its general appearance darker, though the tegulse (as well as the 

 hind tarsi) are not black, but yellowish or reddish. In the upper 

 wings a long and conspicuous dusky streak rims first along (under) 

 the subcosta, then crosses the base of the cubital ai-ea, and then follows 

 the radius up to tlie ajiex of the ^ving. (The meiapleurse are marked 

 with yellow, but the wiesopleiu'se are immaculate.) 10-13 mm. long... 



A. vespa, Retz. 

 (^= tricinctus, F.) 



— A much smaller species than vespa, about 9 mm. long. Abdomen, with the 



three segments following the propodeum, black, the fourth entirely 

 yellow, and the fifth black. The tegulse and the two basal joints of 

 the antennae are bright yellow. (The metapleurse immaculate ! ) Head 

 and thorax as in vespa, opaque, coarsely and rugosely punctixred. Hind 

 tarsi and apex of tibia reddish in the 9 . (I do not know the J and 

 can find no description of it) A. zona, Klug. 



12. Sviperficially very like zona, but at once separable from it by the smooth 



and shining head and mesonotiun. Tegulse entirely yellow. Antennae 

 with the scape only yellow, and even that is genei-ally marked behind 

 with black. Stigma parti-colovired, the base yellow, the apex fuscovis. 

 In both sexes, as in zo7ia, the three segments following the propodeum 

 are black, and the fourth entirely yellow. The apical segments are en- 

 tirely black in the S , marked with yellow in the ? . In both sexes, 

 rather more than the apical half of the hind femur is black, as are also 

 the apices of the tibiae and tarsi A. distinguendus, v. Stein. 



— Tegulae only edged with yellow. Closely related to distinguendus, but 



larger (10-12 mm. long). In the ^ the apex of the abdomen is marked 

 with yellow (in distinguendus it is immaculate). The ? differs fi'om 

 distinguendus in having, like the ? $ of most species, rufescent (not 

 black) apices to the hind tibiae and tarsi, and is luilike that or any 

 other species in the colovir of the fourth abdominal segment after the 

 propodeum, which is (n.b.) yellow at the base and black at the apex ! 

 (In the (? , as in distinguendus, zona, etc., this segment is entirely yellow.) 

 The above characters appear to be constant, but in other points of 



coloration the species is rather variable A. amaenus, Gravenh. 



(= cingulum, Kl.) 



13. Abdomen black, with a broad central yellow band, covering at least the 



whole of one dorsal plate and the sides of that which follows it 14. 



— Abdomen never broadly banded with yellow. (Generally that colour is 



absent altogether, except in faded specimens of originally green species, 

 and in these it never takes the form of a broad transverse band ... 15. 



14. Large species (12-15 mm. long). The abdominal yellow band occupies at 



least two segments in tlie $ and four in the <? , and is continiied across 



