CLASSIFICATION 01? THE ASCALAPHI DJK. 



253 



Genus Acmonotus, n. g. 



Wings very narrow ; the extreme base of the inner margin of the 

 anterior pair with a slight excision, followed by a rather di- 

 lated angulation, but not appendiculate : posterior wings still 

 narrower than the anterior, especially in the basal portion ; inner 

 margin longly and shallowly excised to the base: transverse 

 branch of the lower cubitus confluent with the postcosta in 

 all the wings ; the postcosta rudimentary, scarcely extending 

 beyond the point of junction : network open. 



Antenna much shorter than the wings, straight ; club suborbicular. 



Eyes with the divisions nearly equal. 



Abdomen longer than the wings, slender, gradually attenuated to 

 the apex, provided with a pair of short, slightly divaricate, 

 cylindrical terminal appendices in the 6 ; first segment above 

 elevated into an enormous conical hump, the front side of which 

 is straight, the hinder side convex, notched at the apex. 

 Legs with the spurs nearly equalling the first two tarsal joints. 

 Hab. West Australia. 



A very singular genus, founded on the species described below ; 

 the formation of the 6 abdomen is without a parallel ; but it is 

 uncertain if the $ presents similar characters, though it is pro- 

 bable that somewhat similar peculiarities are present in that sex 

 also. 



Species. 



1. A. incusifer, nov. sp. Frons cinereo-villosus ; clypeo labroque 

 flavis. Vertex fusco-villosus. Antennae flavo-albidae, late nigro-an- 

 nulatae ; clava infra nigra, supra albo-flava, tenuiter pallide annulata. 

 Thorax niger, maculis tribus elongatis, quarum duae longitudinales, 

 una transversa postica, rufis, signatus. Pedes rufo-flavi ; femoribus 

 (apicibus exceptis), tibiis subtus omnino, supra semicinctis duobus, 

 articulorum tarsorum apicibusque, nigris. Abdomen nigrum ; infra 

 macula elongata utrinque atl basin, marginibusque posterioribus seg- 

 mentorum ad latera, rufescentibus : appendices dimidio basali nigro, 

 apicali flavo, nigro tuberculato. Alae hyalinae ; venis venulis ptero- 

 stigmateque nigris; humeris flavescentibus ( c? )• Long. corp. 15"'; 

 exp. alar, antic. 26"', postic. 22"'. 



Hab. West Australia. In Brit. Mus. 



Grenus Suphalasca, Lefebvre (restricted). 

 Wings elongate, narrow, the costal and inner margins nearly 

 parallel ; network rather open ; the transverse branch of the 



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