166 Rev. T. A. Marshall's monograph of 



(7) 4. Posterior angles of the metathorax not 



produced or dentiform. 



(6) 5. Legs flavo-testaceous ; hind femora not 



infuscated 2. riijicornis, Nees. 



(5) 6. Legs rufo-testaceous ; hind femora in- 

 fuscated before the apex . . . . 3. viaculipes, Wesm. 



(4) 7. Posterior angles of the metathorax more 

 or less produced and dentiform. 



(9) 8. Antenna J 19-jointed ; ^ 22-jointed 4. trijmdians, Hal. 



(8) 9. Antennas J 17-jointed ; ^ 19—20- (rarely 



21-) jointed. 



(11) 10. Length, 1 line or less ; the smallest 



species . . . . . . . . . . 5. Jtumilis, Nees. 



(10) 11. Length, 1| — 1^ lines, which is the usual 

 size. 



(13) 12. Radial areolet about twice as long as 



its greatest breadth ; terebra J ^ 



longer than the abdomen .. ..6. hastatus, Ha}. 



(12) 13. Eadial areolet about three times as long 



as its greatest breadth; terebra J 

 much shorter than the abdomen. 

 (15) 14. ^ . Anterior angle of the praediscoidal 

 areolet complete, not being cut off by 

 the parastigma. J antennaj not 

 longer than the head and thorax, 

 and not incrassated at the apex . . 7. paganns, Hal. 



(14) 15. (J. Anterior angle of the praediscoidal 



areolet cut off by the enlarged para- 

 stigma. J antenna3 rather longer 

 than the head and thorax, incras- 

 sated towards the apex . . . . 8. trivialia, Hal. 

 (1) 16. Wings abbreviated ; females only. 



(18) 17. Antemiffi 18-jointed . . . . . . 9. aptenodytes, n. s. 



(17) 18. Antenna; 20-jointed. 



(20) 19. Hind femora annulated with fuscous 

 before the apex ; terebra as long as 

 the abdomen . . . . . . . . 10. amhulans, Hal. 



(19) 20. Hind femora unicolorous ; terebra 



shorter than J of the abdomen . . 2. ruficornis, var. 



1. Blacus tuherculatns, Wesm. 



Blacus tuber culatuSy Wesm., Nouv. Mem. Ac. Brux., 



1835, p. 98; Euthe, Bed. ent. Zeit., 1861, 



p. 132, <? 2 . 

 Ganychorus pallipcs, Hal., Ent. Mag., iii., 41, (? ? . 

 Bracon barynoti and otiorhynchi, Boudier, Ann. Soc. 



Fr., 1834, pp. 333, 334, pi. xi. 

 ? Blacus Floras, Gonreau, Ann. Soc. Fr., 1851, p. 137, 



?. 



