OF THE HIND WINGS OF HYMENOPTEROUS INSECTS. 131 



In Ntssonid^ both the veiniug and the situation of the hooks vary. 



Stizus (fig. 36 a) has 25 distal hooks, commencing on junction before branching. 

 Gorytes mystaceus (fig. 37 a), 12, commencing on junction after branching. 

 Gorytes Natalensis (fig. 38 a), 25, commencing on junction after branching. 

 Mellinus sabulosus, 14, on costal nerve after branching (no junction). 



Thej^ commence on or immediately before the branching of the costal nerve in Andre- 

 NiD^ and Apid.i;, and are large and recurved. They occasionally differ from the pre- 

 ceding families in increasing in size after they commence at the centre of the wing. 



Apid^. 



Xylocopa 49 ? largest in the centre of the row ; very close together. 



Xylocopa 27, first two or three simple, the rest re-curved, diminishing in size 



towards the apex of the wing. 



Melecta 22, largest in the centre. 



Melecta armata .... 17, diminishing towards the apex. 



Anthidium, tig. 46 . . . 29, largest in the centre, broader and sharper towards the base of 



the wing. 



Anthidium manicatum . . 33 ? the wing too broken to be described. 



Panurgus Banksianus . . 11, diminishing towards apex. 



Chrysanthedra. 



Lestis muscana .... 20, diminishing towards apex. 

 Andrenid^. 



Dasypoda hi?'tipes, fig. 45 a. 15, largest in the centre. 



They commence after the branching in Pormicid^, DoRYLiDiE, and Ceabronid^. 



FOBMlClDiE. 



Formica, 24 ? 

 (Ecodoma, 25. 



DOBYLID.E. 



Doj'ylus, 22. 



Cbabbonid^. 



Pemphredon lugubris, 9. 



Mirnesa unicolor, 9. 



Trypoxylon figulus (fig. 41), 13, in two rows (of 

 7 & 6), growing in a line, with an interval be- 

 tween them of the length of one row. 



In Mutilla, fig. 28 a, they grow on the membrane of the wing, above the costal nerve, 

 which appears to dip down to make room for them. They are 17 in number, and 

 commence before the branching. 



In the Tenthredinid^ and two allied families of Xyphidriid^ and Uroceridj^, they 

 are in a single or a double row (one below the other), commencing on the costal 

 nerve before the first junction with the nerve below, with occasional indications of a 

 third series between the two principal rows. 



They are in a single row in 



XYPHIDBIIDyE. 



Xyphidria, which has 11. 

 Tenthredinidje. 



^ ' ■ j Radiating wrinkles above the base of each hook. 



Pterygophorus (fig. So), 10. J 



82 



