A REVISION OF THE CxENUS LOCUSTA, L. 163 



apex triangularl}/ prominent, irregularly denticulate ; hind angles obtusely rounded. 

 Cerci rather large, strongly compressed laterally. Subgenital plate subconical, with 

 the apex attenuate and slightly widened. Penis* short, widely and obliquely truncate 

 posteriorly, with the apex triangular, sharp ; upper genital valves large, united 

 with the penis : lower valves small, lying close to the sides of the penis and covering 

 about half of it laterally, with obtuse upper projections ; they are connected with 

 each other above the penis by a bow-shaped transverse bridge emitting forwards 

 two long, apically narrowed, lateral branches ; epiphallus large, with the two upper 

 apophyses obtusely rounded and projecting inwardly and with lower sharply pointed, 

 beak-shaped teeth, with the inner lobes rounded and minutely and obtusely serrate 

 near the lower angles. 



?.— Supra-anal plate obtusely triangular. Subgenital plate much longer than 

 broad, widened posteriorly, with the lateral margins slightly convex ; apex rounded, 

 bisinuate, with a small projection in the middle. Upper valves of the ovipositor 

 with short, strongly recurved, rather obtuse apices and not very sharp margins. 

 Lower valves with the basal part about as long as broad ; apical part without lateral 

 teeth, with widely rounded lateral angles ; apices feebly decurved, short, acute. 



Genotype : Pachyiylus pardalinus, Walk. 



Key to the Phases of Locustana pardalina. Walk.] (fig. 5). 



1 (2) The average size smaller ; the males much smaller than the females. Pronotum 



more compressed laterally between the shoulders, but less constricted 

 before the middle ; median keel more raised, not lower in prozona than 

 in metazona ; fore margin more or less projecting in the middle ; hind 

 angle sharp. Elytra shorter and narrower, with the margins almost straight 

 and parallel, with the apex obliquely truncate ; discoidal area narrower, 

 parallel-sided, with the false vein straight and not incrassate. Coloration 

 of larvae, as v.^ell as that of the adults, very variable, but the larvae are 

 never coloured black and red. Both larvae and adults occur singly and 

 in loose swarms. . . . . , . . . . , ph. solitaria, n. ph. 



2 (1) The average size larger ; the males only a httle smaller than females. 



Pronotum not compressed laterally between the shoulders, but strongly 

 constricted before the middle ; median keel less raised, in prozona distinctly 

 lower than in the metazona ; fore margin straight ; hind angle rounded. 

 Elytra broader and also longer, with the margins convex, and the apex 

 obliquel}^ rounded ; discoidal area broader, with the sides sinuate, and the 

 false vein distinctly incrassate and sinuate. Coloration of the larvae 

 uniformly black and red. Both larvae and adults occur in dense swarms 



ph. pardalina, Walk. 



* The terminology of the parts of the genitalia adopted here is that of L. Chopard (Recherches 

 sur la conformation et le development des derniers segments abdominaux chez les Orthopteres. — 

 Theses presentees a la Faculte de Sciences de Paris ; Serie A, No. 847, 1920). 



t See the footnote on page 161. 



