282 Mr. Kenneth J. Morton on 



sides, and the anterior margin is equally bordered very lightly with 

 black. 



3rd. The little triangle forming the occiput in front is blackish, 

 surmounted with a crest of hairs mixed of blackish and yellowish- 

 grey; this occiput is not vesiculous before or behind; behind it is 

 yellow with a black sunken line. 



4th. The yellow line between the two lateral bands is absent or 

 much interrupted (reduced to an upper spot in the female). 



5th. Although the median yellow rings may be narrow, those on 

 segments 7-8 constantly reach the ventral suture. The 10th seg- 

 ment has a yellow spot on each side ; the 2nd, 3rd and 4th segments 

 have on each side a narrow yellow transverse terminal line, inter- 

 rupted on the dorsal arete, but this vestige is absent on the following 

 segments. 



6th. The superior anal appendages are notabl}' separated from each 

 other and narrower at their base. Besides the internal sub-median 

 tooth which is a little further removed from the base (being almost 

 in the middle) there is towards the first fourth a second external 

 lateral tooth also inclined towards the base, both of these teeth being 

 visible in profile view. 



The inferior appendage is about f as long as the superior, longer 

 than broad, a little constricted at the extremity which is not appre- 

 ciably notched. 



7th. The costal nervure is hardly yellow outwardh^ The ptero- 

 stigma is shorter, the large cellule near the membranule is almost 

 always divided into three, rarely four cellules. In annularis it is 

 ordinarily divided into five. 



$. Differs from anmtlatus — 



1st. (See above, No. 1.) 



2nd. The labrum always broadly bordered with black on all sides, 

 even in front, the virgule reaching the anterior margin and dividing 

 the yellow into two. 



4th. (See above. No. 4.) 



5th. Colours of abdomen as in the c^, but differing from anim- 

 latus in the absence of the yellow spots at the base of tlie vulvar 

 laminae and by the form of tlie yellow ring of the 8th segment, much 

 interrupted and consisting of only two yellow lines. 



6th. The costal nervure is blackish outwardly, or only finely 

 yellowish between the nodus and pterostigma; the latter shorter 

 and blackish. 



c? ? 



Length of abdomen .... 50-56 mm. 55 mm. 



„ forewing .... 42-45 ,, 49 ,, 



„ hindwing .... 42-45 „ 49 „ 



