532 Mr. R. C. L. Perkins on Hawaiian Ophioninae. 



etc., though in all the species of the former that I have seen 

 the angulation of the transverse median nervure of the 

 hind-wings is in an entirely different position from that of 

 Enicospilus. In the figure by Mr. Rupert Stenton in 

 Morley's work the angulation is figured as being far above 

 the middle. 



The variability of many of the Hawaiian Ophionini is 

 so excessive, that if similar variation occurs in other tropi- 

 cal countries, the group may well prove one of the most 

 difficult of entomological studies. In Enicospilus these 

 variations have to some extent been alluded to in the table 

 of species and for the tribe, as represented in Hawaii they 

 may be classed as follows : — 



(1) Size extremely variable, so that smaller individuals of a species 



(of course of the same sex) may be from J to | the size of 

 the largest. This variability occurs in species of Enicospilus, 

 Athyreodon and Eremotyloides and possibly in other genera. 



(2) Colour often very variable, so much so that possibly nearly 



black forms of all the ferruginous Enicospilus and ferrugi- 

 nous ones of those usually black may occur. It is possible 

 that Ashmead's E. mauicola {dimidiatus. P.) is only a melano- 

 chroic form of E. lineatus. Cam. In fact the actual type 

 of the former is of a somewhat intermediate character and 

 does not agree with his description. Possibly Eremotyloides 

 orbitalis may also have a pale form as in some examples the 

 thorax is red and all the legs pale, while others are blackish- 

 fuscous insects with dark legs, intermediates occurring. 



(3) Neuration very variable in detail, even in points considered 



of importance (though much overrated in this respect, both 

 in parasitic and aculeate Hymenoptera). This variation is 

 sufficiently alluded to above. 



(4) Chitinous thickened spots of the front-wings very variable in 



some species, well-developed in some examples of a single 

 species or totally absent or in all stages of degeneration in 

 other specimens. The glabrous area itself is more constant 

 in its character. 



(5) Sculpture variable in many species, especially the propodeal 



transverse carina. Sometimes this is normally present in 

 one sex, absent in the other, but examples of these are 

 found in which the conditions are reversed. In other cases 

 the carina may be seen in all stages of obsolescence, from 

 strong and complete to total absence. 



(6) Dorsal fovea of 1st abdominal segment very variable, obsolete 



