Vol. Xxiii] ENTOMOLOGICAL NEWS. II7 



Measurments: Male.— length from apex of vertex to tip of supra- 

 anal plate, 11-13.2 mm.; to end of pronotum, 4-4.5 mm.; to the tip of 

 the tegmina, 11-11.8 mm.; length of the pronotum, 2.3-2.6 mm.; of 

 tegmina, 7 mm. ; of hind femora, 10 mm. ; of cerci, 1.6 mm. 



Female.— Length, 11.2-13.5 mm.; to end of pronotum, 4.2-5.0 mm. ; 

 to tip of tegmina, 9.5-11.4 mm.; to tip of ovipositor, 21.3-24.5 mm.; 

 length of pronotum, 2.6-3.0 mm.; of tegmina, 5.5-6.8 mm.; of posterior 

 femora, 11-12 mm.; of the ovipositor, 12-14 mm. 



Structural Characters: Apparently resembling A. nigropleurum in 

 general form, but smaller and slenderer. Fastigium of the vertex dis- 

 tinctly elevated above the plane of the occiput; viewed from above, its 

 sides are subparallel with the slightest indication of a constriction in 

 the preocular region; in its widest part it is between a fourth and a 

 third as wide as the interspace between the eyes; its front margin is 

 truncate and extends anterior to the eyes a distance equaling three- 

 fourths the antero-posterior diameter of the eyes; viewed in front, the 

 facial protion of the vertex is elongate-trigonal. 



The pronotum is relatively short; its disk with its anterior margin 

 shallowly emarginate, its hind margin rotundo-truncate ; lateral lobes 

 nearly as deep as long, their antero-inferior margins distinctly, though 

 slightly sinuate, their posterior margins with a shallow humeral sinus; 

 the ventral angle slightly projecting. 



Tegmina of male usually reaching the front margin of the penul- 

 timate abdominal segment ; that of the female shorter, covering about 

 five-sevenths of the abdomen and usually reaching the hind edge of 

 the sixth segment, but occasionally extending to the penultimate seg- 

 ment. Tegmina of the male from two and three-fifths to three times 

 the length of the pronotum, those of the females from a little more 

 than twice to two and a third times its length. Tegmina in both 

 sexes surpassing the wings by about a fifth of their length. 



Anterior tibiae with six pairs of spines below. 



Posterior femora long and slender, in all cases so far examined 

 without sub femoral spines. Genicular lobes terminating each in a 

 minute blackish spine with an additional subterminal spine below. 



Supra-anal plate of male with its hind margin mesially produced, 

 reflexed downwards and narrowly incised. Cerci roughly sigmoid, 

 closely similar to those of X. spartinae, but slightly slenderer and 

 with a rather narrower apex (see text-figures 5 and 6). Tooth 

 stout, in the same position as in X. spartinae, but distinctly longer 

 than in the latter. As in spartinae the cerci show a prominent bulbous 

 swelling immediately dorsal of the base of the tooth. When viewed 

 from above the cereal teeth are just barely visible behind the supra- 

 anal plate; below they are hidden from view by the subgenital plate. 



