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XI . Descriptions of a new cjenns and four new species of 

 Calopterygidae, and of a neiv genus and species of 

 GomphidsB. By R. McLachlan, F.L.S., Sec. Ent. 

 Soc. 



[Bead 2nd May, 1870.] 



In the course of an arrangement, which I have recently 

 completed, of the Odonata belonging to the family Calop- 

 terygidce in the collection of the British Museum (with 

 which is incorporated that of Mr. Wilson Saunders), I 

 found, among others, the four new species herein de- 

 scribed, one of which forms the type of a new genus. 

 And I have added a remarkable new form of Gomphidce, 

 from my own collection, pertaining to the singular genus 

 Petalia, taken in its broad sense. The species described 

 are as under: — 



Calopterygid^. 



Psolodesmus (n. g.) mandarinus . . Amoy. 

 Euphcea compar ..... Amoy. 

 Mieromerus bisignatus . . . . Celebes. 



Chalcopteryx scintillans . . Upper Amazons. 



GOMPHID^. 



Hypopetalia (n. g.) pestilens . . . Chili. 



Fam. CALOPTERYGID^. 



Psolodesmus, n. g. 



Belonging to the "Legion" Calopteryx (De Selys). 

 Form of Calopteryx (sens, strict.) . All the wings pro- 

 vided with a. large, subquadrate, dilated pterostigma ; 

 quadrilateral slightly convex on its upper margin, and 

 slightly dilated at its extremity ; basal space empty ; 

 arculus angulate; inferior branch of the second sector 

 of the triangle running obliquely into the inner margin 

 in an unbroken line ; all the sectors much ramified and 

 curved at their extremities (in other words, there are 

 5-6 supplementary sectors between each leading one) . 

 First joint of antennae very short. Legs with very long 

 spines. {S ■) 



TRANS. ENT. SOC. 1870. — PART II. (jUNE.) 



