172 Mr. R. McLachlan on new Odonata. 



Wings hyaline, scarcely tinged with yellowish ; veins 

 all black, excepting the first and fourth ante-cubital, and 

 the costal vein over the pterostigma ; pterostigma yellow, 

 surmounting 2^ cellules, dusky at its inner end. Anterior 

 wiiKjs with seven li\ad reddish-brown costal spots, arranged 

 as follows: — (1) a long space at the base, extending 

 nearly to the second ante-cubital, occupying the width 

 of the costal and subcostal areas, and continued obliquely 

 into the basal area, where it changes to blackish; (2) a 

 spot between the fifth and seventh ante-cubitals, rounded 

 above, but occupying the breadth of the subcostal area 

 beneath, giving ofi" a second spot united to it, and smaller, 

 placed below it more towards the base ; (3) a very small 

 spot in the sub-costal area, rather more than halfway 

 between the base and nodus, and continued as a triangular 

 point into the cellule in the costal area above (in one 

 wing there is a still smaller spot beloAV this) ; (4) a very 

 large quadrate spot enclosing the nodus, and extending 

 from the costa to the subnodal sector; (5) a smaller 

 quadrate spot half-way from the nodus to the pterostigma, 

 extending to the nodal sector, but only continued as the 

 point of a triangle to the costa ; (6) an irregular spot on 

 the inner side of the pterostigma; (7) an elongate spot 

 from the outer side of the pterostigma to the ajiex, where 

 it is abrupt, not continued round the margin (these two 

 last spots may be considered as one, divided by the 

 pterostigma), and scarcely extending beneath the principal 

 sector. Fosterior wings with spots similar to those on 

 the anterior, only that the small spot, No. 3, is altogether 

 absent. ( $ .) 



Anterior wings — IQ ante-cubitals, 14 post-cubitals ; 

 posterior wings — 11 ante-cubitals, 14 post-cubitals. Dis- 

 coidal cellules commencing in 3, continued in 2, again in 

 3, and finally in 4-5, rows. 



Length of body, 38 lines ( = 80 mill.). Expanse of 

 wings, 47 lines ( = 98 mill.). 



Hah.— ChiM (Reade) . 



My single exam])le has evidently been placed between 

 the leaves of a book, or in a letter, and both the form 

 and colours of the body are somewhat injured. 



