412 Sir S. S. Saunders on the habits and economy/ 
p. 74), " there is great specific diversity in the form and 
size of the second submarginal petiolated cell, as well as 
in the mode of its receiving the recun-ent nervures ; which 
are sometimes interstitial, inosculating with the transverse 
cubital ner\aires, and sometimes received within it," as in 
Niteliopsis ; while in his subgenus Pisonitus, " the first 
recurrent nervure is received towards the apex of thej'?r5^ 
submarginal cell, and the second recuiTcnt about the 
middle of the second submarginal cell" (1. c. p. 79). 
The antennfe however in Niteliopsis correspond with 
those of Nitela, having the second, third and following 
joints co-equal ; whereas in Pison the second joint is 
considerably shorter than the third. In Pison also the 
eyes are emarginate, but in Niteliopsis, as in Nitela, 
entire. The maxillary and labial palpi also closely cor- 
respond in these latter ; but the mandibles in Niteliopsis 
are simple as in Pison, and not bidentate at the apex, as 
those of Nitela. 
Thus this genus would seem to form a connecting link 
between Pison on the one hand and Nitela on the other ; 
whose affinities, in conjunction with Trypoxylon, had been 
recognized by Latreille as aforesaid ; although later writers 
have removed the genus Pison from these cognate types, 
some to the Nyssonidce and others to the LarridcB. 
The pupa-cases of Niteliopsis are of light clay-coloured 
material, elongo-ovate, rugose and somewhat brittle ; they 
are packed promiscuously amid a quantity of loose refuse 
of all kinds brought from without, and the gallery has no 
cellular separations. 
Those of Nitela are smooth, of a dull cameous tinge, 
darkening towards the anal extremity ; they are loosely 
placed in separate recesses of the pith, but, so far as I 
have noticed, in no regular series. Dr. Giraud, however, 
considers their presence in briars as exceptional, stating 
that they are more fi^-equently to be met with in the trunks 
and branches of decayed trees, although he had also found 
their pupa-cases (which he accurately describes*) occu- 
pying four consecutive cells in a briar from Fontainebleau. 
The transformations of Trypoxylon have been carefully 
recorded by Messrs. Dufour and Perris in an interesting 
Memoire on the Hymenopterous insects reared fi-om briars. 
* Ann. Soc. Ent. Fr. 4« seiic, tome vi. p. 474. 18G6. 
