186 Prof. J. O. Westwood's Notes upon a 



tliink, be sufficient to carry a conviction that, altliougli 

 there are some differences noticeable between the general 

 structure of the heads of the pupa of this new parasite and 

 of the older known species, we have here a true Strepsip- 

 terous parasite, but probably one forming the type of a 

 distinct genus, as might, in fact, be reasonably inferred; 

 and that we cannot regard this new parasite as the pupa of 

 a Dipterous insect, which is, indeed, the only other group 

 to which it might be referred, the hard corneous texture 

 of the head preventing us from referring it to the imma- 

 ture state of any of the parasitic Hymenoptera. 



I am inclined to suppose, with reference to the position of 

 the parasitic insect between the dorsal segments of the abdo- 

 men of the Epora, that the present lower surface of the 

 parasite applied to the dorsum of the abdominal segments of 

 the Epora is in fact the ventral surface of the parasite, and 

 that (supposing the latter to produce a winged male ) the par- 

 asitic imago would, on the scaling off of the cephalotheca, 

 creep out belly downwards upon the terminal portion of 

 abdomen of the Epora. This supposition gives, of course, 

 a clue to the true signification of the different parts of the 

 anterior portion of the head-case, which I have endeavoured 

 carefully to dehneate in figures 4, 5 and 6, as seen in 

 different positions. These parts are in nowise detached 

 from each other, and are simply indicated by depressions, 

 ■which give a different idea of their structure when seen in 

 different positions with the light falling differently on them. 

 The eye-covers appear at the sides of the head, of large 

 size and somewhat lunate form ; between them are two 

 somewhat rounded spaces, partially covered Avith minute 

 granules, between which is a transverse impression which 

 may indicate the suture between the upper and lower 

 lips; there are also two small transverse pieces, which, 

 I suppose, represent the mandibles, followed by two 

 small swollen spaces, which may indicate the maxilla. A 

 precise idea of the real structure of these parts can only 

 be obtained by the actual dissection and examination of 

 more specimens, enabling us to investigate the internal 

 structure of the head-case, as was done by Sir S. Saunders 

 and myself in some of the other species represented in the 

 figures in our " Transactions " above referred to. 



Although unable to give a scientific diagnosis of this 

 new parasite it may be useful to suggest a name for it, 

 which, in reference to its habits, may be called Colacina 

 insidiator. 



