158 M. Edmond Bordage on the Fusion between the 



A distinct species, of which I have one male specimen 

 obtained in Surinam by Mr. C. W. Ellacombe. It has the 

 coloration and facies of Mechanitis pohjmnia^ of which it is 

 no doubt a homojochromatic associate. 



Najieogenes eunomia, sp. n. 



Alis diaphanis, venis et margiuibus nigris, puiictis submargiiialibus 

 albis; posticis raargincm internum versus palHde sulphiirco tiiictis : 

 subtus ut supra, sed punctis submarginahbus albis. 



Hah. N. Peru [Krause). 



I liave a single male specimen from Bates's collection 

 which has for a long time remained unnamed. In general 

 coloration it resembles Ceratinta /rater, but the black margins 

 are narrower and the venation is quite ditfcrent. 



Napeogenes amara, sp. n. 



Napeoc/enes iolosci, G. & S. Biol. Ceiitr.-Am,, lihop. i. p. 27, tab. iii. 

 fig. 4 (parti m). 



N. ioloscp similis, sed colore nigro apicali basin versus magis extenso 

 maculisque apicalibus fiavis minoribiis, 



IJab. Nicaragua, Costa Eica, Cliiriqui. 



Since writing on N. tolosa in the * Biologia ' a large series 

 of this insect has been received from Guatemala and Cliiriqui. 

 The authors pointed out that specimens from southern 

 localities were darker than those from Mexico and Guatemala, 

 but with the material then available they hesitated to separate 

 them. The large series 1 now have leads me to think the 

 differences are sufficiently great to warrant me in describing 

 the Nicaraguan and southern foim as distinct, and I have 

 therefore named it N. amara. 



XX]]]. — On the probable Mtde of Formation of the Fusion 

 between the Femur and Trochanter in Arthropods, By 

 Edmond Bordage *. 



In the present communication it is my intention to show 

 what in my o})inion are the causes which must have brought 

 about the iusion of the trochanter and the femur in the 

 Phasmid^e. The explanation that I am about to give may, I 



* Tiaiislatfd by E. E. Austen from tlie ' Comples Iveiidus Ilcbdo- 

 madaires des Stances de la Socit5t6 de Jiiologie,' t. v. no. t'S, 5 aout, 1898, 

 pp. 8o9-842 : from a separate impression communicated bv the Author. 



