MICROCENTRTJM. 361 



c? . Pronoti canthi paulo magis rotundati, verticis apex primo articulo antennarum duplo latior. Cerci apice 



curvato, acufco. Lamina infra -genitalis stylis teretibus longiusculis instrueta. 

 2 . Long. eorp. 24 ; pronot. 6 ; elytr. 35, lat. 13 ; femor. post. 17 ; ovipos. 6 millim. 

 d . Long. corp. 21 ; pronot. 6; elytr. 31, lat. 11 ; femor. ? millim. 



Hab. Panama, Chiriqui (Champion : 6 ). — Guiana, Cayenne (Prudhomme : 2 ). 



7. Microcentrum laurifolium, Linn. (Tab. XVII. figg. 3-5, $ .) 



Gryllus laurifulius, Liiiu. Syst. Nat. ed. 10, p. 429 (1758) ; Mus. Lud. Ulr. p. 126. 



Locusta laurijolia, Fabr. Ent. Syst. ii. p. 34. 



Phylloptera (Orophus) rhombifolia, Sauss. Rev. et Mag. Zool. (2) xi. p. 204 (1859). 



Microcentrum laurifolium, StaL, Recens. Orthopt. 2, p. 42 ; Brunn. v. W. Monogr. der Phaneropt. 



p. 339. 8. 

 Microcentrum affiliatum, Scudd. Bost. Journ. Nat. Hist. vii. p. 447, fig. 5 (1862). 



Var. a. Minor. Pronoti margo anterior sinuatus, in medio hand produetus. Lamina? infra- genitalis styli 

 gracillimi, breves. — h. Pronoti margo anterior sinuatus, in medio haud produetus. — c. $ . Lamina infra- 

 genitalis leviter incisa. (Mazatlan.) — cl. <$ . Lamina infra-genitalis vix incisa, stylis brevissimis instrueta. 

 — e. <$ . Styli paulo longiores, cylindrici. (Puente de Ixtla.) 



Figuees : — Pig. 3, pronotum, elytron, and wing of the female : — Fig. 4, head and pronotum from above, 

 magnified. — Fig. 4 a, ditto, natural size. — Fig. 5, the head from in front, magnified. 



Hab. Noeth America, Georgia, Texas. — Mexico (Mus. Genavense% Durango and 

 Presidio de Mazatlan (Forrer), Tierra Colorada in Guerrero, Puente de Ixtla in 

 Morelos, Atoyac in Vera Cruz, Teapa in Tabasco (II. H. Smith) ; Guatemala, San 

 Geronimo (Champion) ; Panama, Yolcan de Chiriqui (Champion). 



In this species the tympanal field of the left elytron of the male has three transverse 

 veins, and the postaxillary triangle is membranaceous and reticulated on its inner side. 



Specimens of the variety b, of median size, may be easily confounded with M. reti- 

 nerve, as they have the middle of the anterior margin of the pronotum not or scarcely 

 produced. Nevertheless, it is not difficult to distinguish them from that species, the 

 females having the inferior valve of the ovipositor truncate at the tip and the males 

 having very slender and short styli, while in M. retinerve they are long and thicker ; 

 moreover, in both sexes, the pronotum is flat, with the lateral ridges very slightly 

 interrupted by the anterior sulcus, while in M. retinerve the superior face of the 

 pronotum is transversely canaliculated by two wide shallow sulci, and the lateral ridges 

 are rather strongly cut by the anterior sulcus. 



8. Microcentrum retinerve, Burm. (Tab. XVII. figg. 6-8.) 



Phylloptera retinervis, Burm. Handb. d. Ent. ii. p. 692 (1838). 



Microcentrum retinervis, Scudd. Bost. Journ. Nat. Hist. vii. p. 446 (1862) ; Brunn. v. W. Monogr. 



der Phaneropt. p. 339. 9. 

 Phylloptera salicifolia, Sauss. Rev. et Mag. Zool. (2) xi. p. 204 (1859). 

 Phylloptera totonaca, Sauss. loc. cit. 



biol. cente.-amer., Orthopt., January 1898. 3 Aa 



