INTRODUCTORY REMARKS, 

 (distinction, but one of the terms employed, to my 

 understanding at least, does not convey a clear 

 idea, for I do not perfectly comprehend what is 

 meant by '• Rostrum sursum pUcatum" In genuine 

 jipes the proboscis is folded, as it were, in three 

 lengths, with two elbows, so as, in the act of fold- 

 ing, to form the letter Z {s), the inflected end of 

 the tongue constituting the exterior fold (t), and 

 the lora the interior (w) ; and consequently there is 

 a fold above, or between the middle fold and the 

 head, as well as one beneath it. This is the only 

 sense I can make of it : and, thus understood, it 

 gives a good character of one difference between 

 these genera, but not the best and most obvious : 

 it might, I think, be better expressed sursum et 

 deorsum plicatum. '' Rostrum porrectum" the 

 term employed to express the peculiar character of 

 Nomada, must be understood to signify that the 

 first motion in unfolding the proboscis is to push 

 it forwards beyond the mouth and maxillae (:r), 

 whereas in u4pis it is to unbend the lower fold(?/). 

 I shall hereafter have occasion to employ this term 

 in the same sense. 



Having considered what has been done in this 

 genus by the predecessors of Fabricius, I shall next 

 call my readers attention to the alterations intro- 

 duced into it by that celebrated entomologist, and 

 upon this head I must be more than usually par- 



is) Tab. 13. fig. 2. (0 Ibid. dd,ff, g. (u) Ibid. II>. 

 (x) Tab. 3. it*, b. fig. 1. (y) Tab, 13. fig. 2. dd,ff, g. 



ticular. 



59 



