Indo-Chinese Hymenoptera. 393 



and rather finely punctured. Eyes distinctly convergent 

 towards the vertex, where they are separated by a distance 

 about equal to the combined length of the third and fourth 

 joints of the flagellurn, but a little less than the length of 

 the second joint of the flagellurn. Front with three short, 

 almost parallel, longitudinal carinas, not nearly reaching 

 the anterior ocellus, the space between the carinas in- 

 distinctly obliquely striated ; the front with obscure steely- 

 blue patches. Head broadly rounded behind the eyes ; 

 vertex finely aciculate, opaque, divided by a shallow longi- 

 tudinal groove, which extends almost to the posterior ocelli. 

 Pronotum longer than broad, with a median sulcus, not 

 raised or tuberculate posteriorly, opaque, without distinct 

 sculpture. Mesonotum and scu.tellutu subopaque, almost 

 smooth, pleurae finely and irregularly rugulose. Median 

 segment a little longer than its median breadth, with the 

 usual carinas, the space between the carinas strongly trans- 

 versely striated, the third and fourth carinas convergent at 

 the base, the teeth at the apical angles of the segment very 

 short and blunt. Second tergite a little longer than its 

 greatest breadth ; abdomen smooth and shining. Penulti- 

 mate joint of the hind tarsi not extending as far -as the 

 middle of the apical joint. Fore wing with two cubital cells ; 

 second transverse cubital nervure reaching the radius at a 

 distance from the apex of the radial cell equal to about half 

 the length of the first transverse cubital nervure. 



Hab. Ann am, Kengtrap ; November 27, 1917 ; Xieng 

 Khouang, Ban Sai, December 8, 1918 {type). 



The colouring and the exceedingly elongate clypeus render 

 this species very conspicuous. In colour it is nearest to 

 A. ruficornis, Cam., but differs in the steel-blue colour of 

 the median segment and abdomen, in details of sculpture, 

 and in the much greater size. I doubt if it belongs to the 

 same group as A. ruficornis, both seem to mimic roughly 

 the colouring of Sima rufonigra. 



Subfamily Prilanthinje. 



Cerceris tonkinensis, sp. n. 



cJ . Brunneo-ferrugineus ; capite, mesosterno, coxis basi, femoribua 

 posticis, tibiisque posticis, basi ocbraceis, nigris; vertice, antennis, 

 mandibulis basi, clypeoque apice fusco-ferrugineis ; tegulis, 

 pedibus, segmento mediano macula magna utrinque areaque 

 basali flavo-oohracei3 ; segmento abdominali primo lateribus et 

 subtus, tergitis 1-6 fascia apicali, ster.uito secundo subtus, 



Ann. <& Mag. N. Hist. Ser. 9. Vol. iv. 29 



