MESSRS. R. E. TURNER AXD J. WATERSTOX ON THE 



tarsi, and the strongly bent recurrent nervure. In one or two 

 abei'rant species one or more of these characters may be only 

 feebly developed, but the long labrum is always present. The 

 best account of the genus is given b}- Cameron, but his description 

 of the generic characters is founded on a single species, and one 

 or two characters given are merely specific. Thus the petiolar 

 area and a,reola are usually separated, not confluent, and the 

 nervulus is often more or less postfurca.1, as noticed by Morley. 

 Cameron is inclined to place the genus in the Ichieitmonhice, as 

 a separate tribe; the great objection to this placing is in the 

 position of the spiracles on the petiole only a. little behind the 

 middle, and much neai-er to each other tha.n to the apex of 

 the segment. It seems, however, on the whole, a more natural 

 position than either among the Tryphonince, with which it was 

 placed by Brulle, or \ienv Banchus, where Morlej' is inclined to 



Text-fisrure 1. 



Litbitnn nioiitivii(/iuii Tuni. & \\'ti>t. Thorax, pruj.OLkoii, and pctiulc 

 ill p.olile. 



place it. We give a full account of the sculpture of the median 

 segment (text-tigs. 1, 3, and 10), as far as it is common to all the 

 species : carina between the short basal ai-ea and areola usually 

 indicated by short lateral stumps ; areola and petiolar ai-ea, some- 

 times confluent : pleural and juxta-coxal arefe confluent anteriorly, 

 but separated up to ^ or beyond posteriorly. The surface of the 

 basal area and areola is smooth, more or less rugulose round the 

 sides ; of the external area smooth or finely punct\ii-ed : the an- 

 terior part of the spiraculai- area is a.lso punctured, generally rather 

 strongly so. The other arefe vary in sculpture, the juxta-coxal 

 always showing some strong ridges, indicabetl at least anteriorlv. 

 Sculpture of the male usually coarser than in ihe female. The 

 sculpture of the area? is liable to considerable individual variation 

 in intensity. 



Species of Thynnidpe of the genera Eironc and Tuchi/noviyia 



