HEMIPTERA—HOMOPTERA— APHIDES. 273 



dorsuosus and exceeding'ly long, Ijeing nearly half as long- as the wing. 

 The cnbital vein arises at about the middle of the proximal half of the 

 space between the first oblique and stigmatic veins, takes a course in the 

 spaco open to it, a little below the middle, and forks only a little before the 

 stigmatic vein, far from its base and very low down, the inferior branch 

 being short. 



Length of body, 3.5"" ; of fore wing, 7.5™™. 



Named for my friend, George Bowdler Buckton, Esq., whose mono- 

 graph of the British Aphides is a monument of patient work. 



Florissant. Two specimens, Nos. 2067, 14289. 



15. PTEROSTIGMA Buckton. 



Pterostigma Buckt., Mouogr. Brit. Aphides, IV, 178 (1883). 



Head and antennae precisely as in Anconatus, excepting that the basal 

 antennal joints are slenderer, so that the frontal space between the antennae 

 is several times their width.' Fore wings exceptionally narrow, with the 

 straight postcostal vein distant from the convex margin, the stigmatic vein 

 arising before the middle of the long, curving and tapering stigma, so that 

 the cell is nearly two-fifths as long as the wing (it is shorter than would 

 appear from the plate). Cubital vein very feeble, once forked well before 

 the base of the stigmatic vein and at no very great distance from its own 

 origin, which is near the middle of the space between the first oblique and 

 the stigmatic veins. Second oblique vein arising close to the first and 

 many times nearer it than the cubital vein, sinuous and diverging from the 

 straighter first oblique vein at a considerable angle, so that the first discoidal 

 cell between them is about four times broader on the hind margin than at 

 the base. Legs very slender, but not very long. Abdomen pretty regu- 

 larly oval, apically i-ounded. 



Table of the species of Pterostigma. 



Bases of tbesecond oblique and stigmatic veins hardly more distant than the extreme breadth of the 

 wing r. P. reciirriim. 



Bases of the second oblique and stigmatic veins more than half as distant again as the extreme bread tli 

 of the wiug 2. P. nigrum. 



■ What Buckton took for a rostrum of three joints is a broken pare of the right antenna. 

 VOL XIII IS 



