i88;!.i 127- 



TWO NEW SPECIES OF ANAX, WITH NOTES ON OTHER 

 DEAaON-FLIES OF THE SAME GENUS. 



BY ROBERT McLACHLAN, F.R.S., &c. 



AlSTAX "WALSI>rGHAMI, 11. sp. 



Length of abdomen (cam appendic), ^ , 86 mm., ?, 77 mm. Length of pos- 

 terior wing, g , 60 mm., ? , 58 mm. Expanse, ^ , 128 mm., $ , 120 mm. 



Wings hyaline (slightly tinged in the $ ). Neuration black or blackish ; costal 

 nervure yellow externally. Membranule blackish, wMte at the base. Pterostigma 

 narrow, rather short (5 mm.), brown. 19 ante-cubital and 10 post-cubital nervules 

 in the anterior wings in (? , 15 and 8 — 10 in the ? . 



Face and mouth parts wholly yellow (? green in the living insect). Top of 

 front with a circular (or slightly oval) black spot placed in a dusky (or slightly 

 bluish) ring, the anterior portion of which becomes merged in a fine blackish line 

 margining the groove. Vesicle blackish behind, yellowish in front, with a crest of 

 black hairs ; basal joints of antennae black. Occiput vei'y small, yellow, triangular, 

 flat, scarcely emarginate. Back of head yellow, with a narrow blackish margin. 



Thorax uniformly pale yellowish-green (in the dry insect), the double dorsal 

 crest, and crests of the posterior cavities, brownish with black tubercles ; there is a 

 fine clothing of cinereous pubescence. 



Legs black ; femora pitchy-brown merging into black, the anterior yellowish 

 beneath : length of posterior femora, <?, I3J ram., ? , 11^ mm. 



Abdomen slender and very long, slightly depressed in the ^ , shorter and more 

 cylindrical in the $ ; third segment laterally constricted in the (? ; median trans- 

 verse suture on the 2nd segment scarcely complete ; 3rd to 6th segments very long, 

 with the supplementary transverse suture placed considerably behind the base of 

 each : colour greenish (or bluish) in life, with a dorsal longitudinal brown band, 

 which becomes somewhat dilated at the supplementary sutures, and occupies the 

 whole of the posterior portion of each segment from the 3rd, extending in an oblique 

 ruanner along the sides of the segments, so that the pale colour is really indicated by 

 long lateral spots enclosed in dark ground, but on the 3rd segment the sides are nearly 

 wholly pale ; 1st segment brownish at the base ; 2nd with a large triangular pos- 

 terior brown spot, and brown sutures ; 7th to 10th nearly wholly brown, with pale 

 lateral spots. Lateral depressions extending from the 3rd segment to the 9th, but 

 only faintly indicated on the 8rd to 6th in the ^ (more strongly so in the $ ). 9th and 

 10th segments more depressed, and somewhat widened in the S ; lOth segment in the 

 (? slightly broader than long ; sides slightly dilated and rounded ; rather more than 

 the basal half of its upper surface sliglitly elevated, on which portion are three 

 raised sinuate parallel keels, the median sepai-ated from the outer by a deep cavity 

 on either side of it ; beyond this portion there is a depression, but the apical border 

 is raised, shining and blackish, with a faint central keel, the margin being nearly 

 straight. 



Superior appendages in the ^ short (5^ mm.) and broad, brown, flattened and 

 foliaceous, their apices upturned if viewed laterally ; each is narrow at its base, 

 but gradually expands, so that it is widest and sub-truncate at the apex ; the inner 



