135 



Xesoprosojti-'i was separated hy ])i'. Perkins largely on the 

 character of the eight sternite of the 6 and this does not seem 

 to nie to he so strongly different from some species still re- 

 maining in the rild geims l^romjiix. 



He supplements this character l)y rlie hick of enclosure of 

 the basal area of the propodenm. Most of the species have 

 ahsolntely no clear line bounding this area. However the 

 area is clearly defined in some of the species such as X. 

 fiiscipennis (Smith) and iV. pubescens Perkins. 



I am inclined in studyiug the Tlylaeidae to give con-idcr- 

 idile importance to the structure of the snpraclypeal area and its 

 extension above between the antennae. While frequently it is 

 not easy to describe this structure, it seems to be very charac- 

 teristic in the different groups. In this character Xcsopi-o.-^opis 

 differs from Hi/Iaeus in the more limited sense which I should 

 use it. In Nesoprosopis this area is convex between the anten- 

 nae and narrowed, rounding down at the sides to the rest of 

 the surface without angles, ridges or carinae; it is also not 

 narrowed in the middle nor expanded and elevated at its sum- 

 mit, but is sub-triangnilar in form, and with a fine shallow 

 channel leading from near its smninit near to the anterior 

 ocellus. 



The sides of the propodenm are separated from the poste- 

 rior face by a sharp angle not rouii<le(l off nor on the other hand 

 surrounded by earinae as in many species described as /*r()sopi.s. 

 This structure is identical with that of typical Jli/Jtictis. 



IS. Hvi-AKUs Falti'icins (Latreille enu'iid). 



The species of Europe and Xorth America described nuiin- 

 ly as Prosopis may perhaps some of them be broken off into 

 se])arate sul)genera but generally speaking, those which 1 have 

 seen seem congeiierii'. 1 have not been able to examine many 

 of the Euro])ean species, but those which I have do not seem 

 readily separable. Generally speaking the species show little 

 differentiation in the character of the edeagus. ^lore variation 



