102 HYMENOPTEBA. 



The species from our region belong to Bembecinus, Costa, sec. Patton. They chiefly 

 differ from typical Stizus, Patton, in two of the terminal joints of the male antennae 

 being spined, and in the " submedial cell of the posterior wings " being " narrow," 

 «* extending no more than its own breadth beyond the origin of the transverse medial 

 nervure." There are two North-American species of Bembecinus, while the section is 

 also known in Europe, the type being the well-known Stizus tridens, Fabr. Three of 

 our species have the second cubital cellule appendiculate. 



I A. Second cubital cellule appendiculate. 



1. StizUS agilis. (Stizus godmani, Tab. V. figg. 8, head from in front, 8 a, 

 antenna, 6 ; 8 b, head from in front, 8 c } antenna, $ .) 

 Larra agilis, Smith, Ann. & Mag. Nat. Hist. 4th ser. xii. p. 402 (1873) \ 



Hab. Mexico, Presidio (Forrer), Atoyac in Vera Cruz (Schumann), Teapa in Tabasco 

 (H. H. Smith) ; Guatemala, Teleman in Vera Paz (Champion).— Bkazil, Ega 1 . 



Antennae thickened beyond the middle ; the scape bright yellow beneath ; the 

 flagellum brownish beneath and microscopically pilose ; the third joint a little longer 

 than the fourth ; the spine on the antepenultimate joint thin, straight, that on the 

 terminal joint much broader, stouter, and slightly curved. Head with scattered shallow 

 punctures; the vertex and occiput bearing long pale hair; the front and clypeus 

 densely covered with silvery pubescence; eyes large, converging beneath; clypeus 

 broadly onvex, the apex roundly and shallowly curved ; labrum broadly rounded ; the 

 inner orbits, and the head below the antennae, yellow, the clypeus with a broad black 

 line in the centre. Thorax closely punctured, more strongly so on the median seg- 

 ment ; covered with pale hair, the hair especially thick and long on the median 

 segment; the sides with a silky pubescence; a line on the pronotum above, the 

 tegulee, a short line along them on the mesonotum, a broad mark on each side of the 

 scutellum, the postscutellum, and the teeth on the median segment, bright clear 

 yellow ; there is an oblique fine furrow on either side of the median segment, which 

 slopes down from it to the teeth rather abruptly. Abdomen shining, with a bluish 

 tinge ; sparsely and finely punctured ; covered with pale white hair, the hair longest 

 on the sides and apical segments ; the segments banded with yellow at the apices ; 

 the last segment strongly punctured, rufous at the apex ; the ventral segments densely 

 covered with pale hair and edged with yellow. Legs black ; the knees, a line on the 

 femora behind, a line on the anterior four tibiae in front and on the posterior tibiae 

 behind, the spines and spurs, and the tarsi (except a line on the basal joint behind), 

 yellow ; the tarsi inclining to rufous at the apex. 



The example from Presidio has the clypeus black, except at the sides, and there is a 

 short black line below the antennae, but the scutellum is not marked with yellow 



