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. YV. Ellacombe. It has the 

 coloration and facies of Mechanics polymnia, of which it is 

 no doubt a homoeochromatic associate. 



Napeogenes eunonria, sp. n. 



Alis diaphanis, venis et margiuibus nigris, punctis submarginalibua 

 albis; posticis marginem internum versus pallide sulphureo tinctis : 

 subtus ut supra, sed punctis submarginalibus albis. 



JJab. N. Peru (Krause). 



I have a single male specimen from Bates's collection 

 which has for a long time remained unnamed. In general 

 coloration it resembles Ceratiniaf rater, but the black margins 

 are narrower and the venation is quite different. 



Napeogenes amara, sp. n. 



Napeogenes tolosa, G. & S. Biol. Centr.-Am., Rhop. i. p. 27, tab. iii. 

 tig. 4 (partim). 



A r . tolosa' similis, sed colore nigro apieali basin versus magis extenso 

 maculisque ai>icalibus flavis minoribus. 



JJab. Nicaragua, Costa Rica, Chiriqui. 



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

 of this insect has been received from Guatemala and Chiriqui. 

 The authors pointed out that specimens from southern 

 localities were darter 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 Niearaguan and southern form as distinct, and I have 

 therefore named it A 7 , amara. 



X X 1 1 1 . — On the probable Mi de 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 opinion are the causes which must have brought 

 about the fusion of the trochanter and the femur in the 

 Phasmidse. The explanation that I am about to give may, I 



* Translated by E. E. Austen from tbe ' Comptes Eendus Hebdo- 

 mndaires des Stances de la Soci6t6 de Biologie,' t. v. no. 28, 5 aout, 1898, 

 pp. 8139-842 : from a separate impression communicated by the Author. 



