1863.] MR. H. W. BATES ON INSECTS FROM MADAGASCAR. 479 



20. PoLYBOTHRis coLLiciATA, Guerin-M^aeville, Magasia de 

 Zoologie, pi. 27. 



A second species of this group, P. auropicta, was contained in the 

 former collection sent by Mr. Caldwell. The group, formerly con- 

 sidered a genus, comprises fourteen species, all peculiar to Mada- 

 gascar ; it has been reunited by Lacordaire, the latest authority on 

 the subject, to Psiloptera, a widely distributed genus, in consequence 

 of the want of absolute structural characters to distinguish it ; the 

 species, however, may be considered as forming a good subgenus. 



21. Lacon vestitus, Klug, Ins. von Madag. p. 64. 



Peculiar to Madagascar. The genus, however, is a cosmopolitan 

 one. 



22. Macrotoma corticina, Schonh. Syn. Ins. iii. p. 345, n. 54. 



This species is also peculiar to Madagascar; but many closely 

 allied species are known to inhabit the warmer parts of the Old 

 World. 



23. Stellognatha maculata, Oliv. Entom. t. iv. p. 68, n. 87, 

 pi. 7. f. 49 a, b, andf. 174 a, 6. 



Both species and genus of this large and striking Longicorn are 

 peculiar to Madagascar. It belongs to the Sternotomince group, 

 which is peculiarly African. 



Order ORTHOPTERA. 



24. Mantis marginata, Fab. Ent. Syst. Suppl. p. 191. (M.pus- 

 tulata, Stoll, f. 73 ; Serv. Hist. Nat. des Orthop. p. 186). 



This is a common African insect, and is found also in Mauritius. 



25. Mantis caldwellii, n. sp. 



$ . Modice elongata, pallide viridis. Caput robustum, denticulo 

 parvo utrinque inter basin antenncB et oculum. Prothorax la- 

 tiusculus (long. 7^ lin.), supra coxas anticas paulo ampliatus, 

 lateribus leviter denticulatis. Abdomen grossum, prothoraci 

 longitudine cequale, supra rubro maculatum. Elytra abdomine 

 paulo longiora, apice modice attenuata, costa arcuata, area 

 costali tertiam partem latitudinis constituente ; viridi-opaca, 

 stigmate concolore ; utrinque marginem posticam versus hyalina. 

 Ala hyalince, venis roseo tinctis, apicibus viridibus. Pedes sim- 

 plices, modice elongati : coxis anticis supra multi-denticulatis, 

 intus cumfemoribus immaculatis. 



Long. I" 7'"— 1" 9'". 



This species, of which there are two female examples, has no very 

 close relative at present known — the nearest approximation being the 

 group of species allied to M. unimaculata of Stoll, natives of Eastern 

 Africa. 



