158 Mr. R. MacLachlan's Monograjih of 



Prothorax covered with small wart-like tubercles ; 

 black above ; the anterior margin narrowly yellowish, 

 the posterior margin broadly reddish ; an indistinct 

 reddish lanceolate mark in the middle posteriorly, and 

 another on each side ; margins of the deflexed pronotum 

 reddish-gray ; the triangular portion of the pro-sternum 

 seen posteriorly black. Mesonotum black, with a trian- 

 gular yellowish space in front. Metanotum wholly black. 

 Meso- and Meta-sterna black, with a yellow oblique line 

 on each side. 



Abdomen pitchy-black above ; the sides with a yellow 

 line, which dilates on the anterior portion of each 

 segment, a lateral yellow line extending from the base 

 to the antepenultimate segment ; beneath, the two basal 

 segments are spotted with yellow, afterwards the 

 posterior margin of each segment is broadly yellow. 

 Penultimate dorsal segment much swollen, nearly quad- 

 rate, the sides rounded ; terminal segment forming a 

 transverse yellow plate, the anterior margin of which 

 is excised (PL VIII. fig. 4 a) . After death the 

 sides of this segment collapse, and then the plate 

 assumes the form represented by fig. 4 c. Beneath the 

 deflexed lateral margins of the penultimate segment are 

 blackish with a gray spot, provided with a long, thin, 

 curved, pointed, reddish-testaceous crotchet, extending 

 nearly to the apex of the terminal segment ; and at the 

 base of this crotchet is a shorter one, the curved apex 

 of which is directed outwardly; jienis with a greatly 

 dilated yellow apex, with a black corneous line in the 

 middle, which is dilated near the base (PI. VIII. fig. 

 4 &) . In the female the last ventral segment appears nearly 

 quadrate, slightly transverse, the apex truncated. 



Legs yellowish ; the femora (especially the posterior) 

 and terminal tarsal joint fuscous. 



Wings (PI. VIII. fig. 4) narrow; the costal margin 

 nearly regularly rounded ; pterostigma long, very pale 

 yellow, with one transverse veinlet commencing and 

 ending almost at the same points as the cellule below it ; 

 suhcosta joining the costa slightly before the ptero- 

 stigma ; six to seven costal veinlets ; three discoidal 

 areoles ; first apical vein forked, not starting from the 

 edge of the pterostigma ; terminal veins mostly once 

 forked at the apical, and simple on the dorsal margin ; 

 neuration black, the base of the longitudinal veins 

 yellowish. 



