( Ixxv ) 



Sesia, etc. There is no trace of real spines on the first tergite, or on the 

 parai)leurae. The latter are always simple, flat, not raised in front to a flap ; 

 in short, there is nothing recalling the special structures of some other 

 Heterocerons families. In front of the parapleura we iiud the first abdominal 

 stigma (sfi) : it lies free in the membrane. The stigma of the species in which 

 the abdomen is pressed closely against the breast is not visible without separating 

 the abdomen from the metanotum. The second to sixth tergites are essentially 

 of the same strnctnre, the spines of the posterior ones becoming stronger, however, 

 as said above. The seventh tergite is longer, with the sides more strongly 

 converging anad in most species ; it has a quadrangular shape in Sesia, ^[acro- 

 glossum, etc., or becomes more or less conical or elongate-trapeziform (most 

 genera). The eighth tergite is small, and jiartly (c?) or completely (?) concealed 

 by the seventh. This segment will be described below. The parapleurae of 

 segments 2 to 8 are membranaceous and bear the stigmata. The second 

 stigma, however, is situated upon the tergite (PI. LXIII. f. 1), and the third one 

 half upon the tergite and half upon the parapleura. The eighth segment and 

 following have no stigmata. 



The sternite of the first segment is absent, or perhaps vestigial and merged 

 together with that of the second. In the special part of this Revision we 

 understand under second, third, etc., sternite, the sternite of the second, third, 

 etc., segment. In Sphingidae, as well as other families, the structure and shape 

 of the sternites of the first and last segments require special attention, as they 

 undergo sometimes remarkable modifications. The second (= basal) sternite of 

 Sphingidae touches the merum of the hindcoxa, with which it is connected 

 by a short membrane. In by far the larger unmber of species it is slanting 

 (PI. LXIII. f. 1), transversely impressed in front, the impression ending at 

 each side in a small but often deep groove, and is mesially carinate in front, 

 the carina fitting in between the coxae. The sternite of Macroglossum differs 

 from the normal type in the narrower frontal part being vertical, and the main 

 portion of the plate on a level with the following segments and with the 

 posterior trochanters ; the low mesial carina is found on the vertical portion 

 of the segment, and the anterior edge of the horizontal portion is smooth and 

 evenly curved. Haemorrkagia, Cephonodes, and a few allied genera have the 

 frontal part of the segment also vertical, and so incurved that the edge of the 

 horizontal part projects forward. This edge is not simple as in Macroglossum, 

 but is mesially produced into a conical obtuse tubercle, which fits in between 

 the posterior pair of trochanters (PI. LXIII. f 2 ; in this figure the interspace 

 between abdomen and coxa is purposely drawn too wide, in order to show the 

 process of the sternite). 



The sternite of the seventh segment appears in the female sex of Spliingidae 

 in two principal types. Tiie ordinary type is that illustrated by PI. XIX. f. 11 

 and PI. LXIII. f. 3 and 4. Here the apical portion of the sternite is more 

 or less broadly membranaceous ; the stronger chitinised plate is short, broadly 

 rounded, or sometimes elongate-trapeziform, with the apex faintly sinuate. The 



