240 MEMOIRS OF THE CARNEGIE MUSEUM 



Hind tarsi much longer than their tibine, the basal joint long 28 



Hind tarsi not longer than their tibia?, the basal joint short 29 



28. First joint of flagellum smaller than the second; mandibles bidentate ; hind tibiaj with several very 



long bristles, the first joint two thirds the length of the tibia Colyostichus Mayr. 



First joint of flagellum much longer than the second ; mandibles unidentate at apex ; hind tibise with- 

 out long bristles Sycoryctes Mayr. 



29. First joint of the flagellum only a little longer than the second and not much longer than thick ; man, 



dibles very long, strong and toothed within ; hind tibiie with short stifl" bristles ; all joints of tarsi 

 slender ; pronotum very large, quadrate, larger than the meso- and metanotum united. 



Goniogaster Mayr. 



30. Head large, sinuate anteriorly and posteriorly, and also with the lateral margins posteriorly incised so 



as to form a tooth just before the hind angles ; wings represented by a pair of thread-like filaments ; 

 antennte lO-jointed, with 2 ring-joints, inserted widely apart or laterly close to the eyes, the scape 

 very large, dilated, quadrate above, rounded basally, and beneath at base deeply incised ; mandibles 

 robust, triangular, curved, the tips bifid, within towards base produced and tridentate. 



Sycobiella Westwood (type S. gaundersii Westw.). 



Head large, transverse ellipsoidal, sinuate anteriorly, rounded posteriorly, the hind angles rounded ; 



wings entirely wanting ; antennae 9-jointed, with 1 ring-joint, inserted on the middle of the face. 



much nearer together than to the inner margin of the eyes, the scape very large, dilated, clavate ; 



mandibles long, porrect, the tips bidentate, dilated towards base, the dilation being tridentate. 



Walkerella Westwood (type W. timeraria Westw.). 



31. Tarsi 4-jointed ; wings represented by thread-like filaments 32 



Tarsi 3-jointed ; wings wanting 33 



32. Head oblong-quadrate, emarginate or sinuate anteriorly and posteriorly ; ocelli absent ; antennifiS-or 



9-jointed, without a ring-joint, inserted far above the middle of the face, the scape large, dilated, 

 clavate ; mandibles large, porrect, nearly as long as the head, curved, the tips bifid, the inner 

 margin armed with a tooth near the middle or sometimes truncate. 



Otetesella Westwood (type 0. digitata Westw.). 



33. Antennae 9- to 11-jointed (the club sometimes 3 joints), with one ring-joint, shorter than the head and 



inserted close together near the mouth, the scape large, depressed, subclavate; mandibles small, 

 acute, slightly curved, withoutieeVa within Sycoscaptella Westwood (type S. affinis Westw.). 



34. Postmarginal vein distinct, well developed 35 



Postmarginal vein wanting or but slightly developed 39 



35 Second joint of the funicle not shorter than the first 36 



Second joint of the funicle very short, annular, much shorter than the first. 



Antennse 12-jointed, with 2 ring-joints ; pronotum long Colyostichus Mayr. 



36. Antennse 11-12-jointed, with 1 or 2 ring-joints, inserted much nearer to the moutli than to the middle 



of the head, the funicle 5-jointed 37 



Antenna} 13-jointed, inserted below the middle of the head, the furrows in the joints of the flagellum 

 not ending in little teeth 38 



37. Postmarginal vein longer than the stigmal ; mandibles not long, falcate, 2- or 3-dentate ; antennae 11- 



12-jointed, the club not much thicker than the funicle ; pronotum subquadrate, a little wider at the 

 middle than before or behind ; scutellum large, subconvex, the parapsidal furrows very fine, but 

 distinct Colyostichus Mayr. 



