EXPLANATION OF THE PLATES, 383 



TAB. V. 



Fig. 



1. Male of Ibla Cumingii, magnified thirty-two times. 



(«.) Mouth. 



(b.) A slight double fold, formed by the basal edge 

 of the labrum, and by a lower fold, which at (//) 

 becomes well developed ; the latter is a rudi- 

 mentary representation of the double membrane 

 and valves forming the capitulum. 



(c.) Eye. 



(d, d.) Torn membrane from the sack of the 

 female, constricted round the body of the male. 



(e.) Terminal or basal point, with the prehensile 

 larval antennae, represented on rather too large 

 a scale. 



(/.) The imbedded portion of the male. 



(</.) Two pairs of cirri. 



(h.) The fold above alluded to, concealing a small 

 portion of the slightly retracted thorax. 



2. The male of Ibla Cumingii, viewed from vertically 



above; magnified about sixty times. The 

 dotted lower portion, represents the outline of 

 the thorax and the positions of the cirri, which, 

 from standing below the mouth, could not be 

 well seen, when the summit of the mouth was 

 in the proper focus. 



(a.) Labium, largely bullate. 



(b.) Palpi. 



(c.) Mandibles. 



(d.) Maxillae. 



(e.) Outer maxillae ; between which and the crest 

 of the labrum, the orifice of the oesophagus can 

 be obscurely seen. 



(/.) Anus. 



(g.) Rudimentary caudal appendages, under which 

 is the pore leading from the vesiculae seminales- 



(//.) Posterior cirrus, (i.) Anterior cirrus. 



