118 PROCEEDINGS OF THE NATIONAL MUSEUM. 



TABLE OF TRIBES. 



Hind tibial spurs very s/tort, much less than half the length of the basal joint of tarsi; 



ovipositor very long, longer than body Tribe I. Macrocentrini. 



Hind tibial spurs very long, the inner spur being half as long as the basal joint of 



tarsi (or even longer); ovipositor short, usually mu(;h shorter than the abdomen. 



Tribe II. Zelim. 



Tribe I. MACROCENTRINI. 



The totally different shape of the abdomen, the longer ovipositor, 

 and the very short hind tibial spurs, readily distinguish this tribe. 



Five genera have been recognized, one — the tirst — being found only 

 in Africa; the others in the European and American faunas. 



TABLE OF GENERA. 



Radius with only two abscissa' 5 



Radius with three abscissie. 

 Palpi very long; second joint of hind trochanters usually crowned with minute 

 spines 2 



Palpi much shorter; second joint of hind trochanters normal, without minute 

 spines 4 



2. Median and submedian veins normal, the marginal cell not abnormally large, 



the radius not extended to apex of the wings 3 



Median and submedian veins incrassated before the transverse median nervure, 

 the marginal cell abnormally large, the radius extending to the apex of 

 thawing; first discoidal cell petiolate. (Africa.) 



(924) Dicritnoneura Krieehbaumer. 

 ?,. Submedian cell in front wings not longer than the median, the transverse median 



nervure interstitial 4 



Submedian cell in front wings always longer than the median. 

 First discoidal cell sessile; radius in- the hind wings distinct. 



(925) Macrocfnlrus Curtis. 

 First discoidal cell petiolate; radius in the hind wings absent. 



(926) AmicopUdea Ashmead, new genus. 

 (Type, Zele pallidiventrix Provancher. ) 



4. First discoidal cell sessile; second cubital cell scarcely half as wide at apex as at 



base; radius in the hind wings distinct (927) Amicoplus Forster. 



5. The second cubital cell triangular; median and submedian cells of an ecjuai 



length (928 ) Micro! i/]>us Ratzeburg. 



Tribe II. ZELINI. 



The very much longer hind tibial spurs, tlie compressed or subcom- 

 pressed abdomen, and the short ovipositor readily distinguish this 

 tribe. 



The compressed shape of the abdomen cause these insects to be fre- 

 quently mistaken for Ophionines, in the tribe Paniscini, although the 

 venation is quite distinct. I often find our larger species, belonging 

 to the genus Zele, confused in collections with Panwciis. 



