36 [September, 



marked with black at the base, but otherwise (excepting at the pterostigma) the 

 neuration is entirely pale : on the inner margin (opposite to the pterostigma) is an 

 oblique, pale smoky-grey cloud. 



Length of body, 16 mm. Expanse of wings, 49 mm. Greatest breadth of 

 anterior wings, 11 mm. ; posterior, 8 mm. 



New Gruinea (Ausus, A. B. Meyer, 1873). 



This fine insect belongs to the Dresden Museum, and has been 

 communicated by my friend Baron E. de Selys-Lougchamps, to whom 

 it was forwarded by Dr. Kirsch, of Dresden, for identification. I 

 believe it is a (^ , but the abdomen has been laterally crushed. 



It differs from M. osmyloides in its much larger size, semi-opaque, 

 whitish, non-iridescent wings, the presence of smoky-grey marginal 

 streaks or clouds, the broad claret-coloured vitta of the pronotum, &c. ; 

 and in M. osmyloides, the transverse reticulation is almost entirely 

 black. I believe osmyloides extends into the Malayan islands (although 

 it is typically from Queensland), and I have an example labelled 

 " China," though there may be some doubt as to the correctness 

 of this. 



The two other Australian species, M. sejunctus, Walker, and 



armatus, McLachlan (possiby sexes of one) differ in their very much 



narrower anterior wings and less complicated neuration (the costal 



veinlets being for the most part simple), and also in their remarkable 



genital armature. 



Lewisham, London : 



Qth Auyust, 1877- 



ON SOME NEW AND LITTLE-KNOWN FORMS OF AGRIONINA 



(LEGION PSEUDOSTIGMA, DE SELYS). 



BY R. McLACHLAN, F.R.S. 



The group of tropical American Odonata forming the Legion 

 Pseudostigma of the sub-family Agrionina is of extreme interest, as con- 

 taining the largest of existing Dragon-flies, and on account of the 

 extreme length of the slender abdomen, and the tendency exhibited 

 to run into puzzling local forms. Tlie Legion formed the first in De 

 Selys' "Synopsis des Agrionines " (only just completed), and was 

 worked up by him in 1860. "With the exception of the description by 

 Hagen (in 1869) of a new species, nothing has been written on the 

 group since that time, and as so much has since been done towards 

 the exploration of the regions where these insects occur, it is natural 

 that additional materials should have been obtained. I propose to 

 give here descriptions, &c., of a few remarkable forms existing in my 

 own collection, being prompted thereto by the discovery of a species 

 having a very anomalous neuration. , 



