M1MESA. 137 



origin of the anal nervure. Legs short, pilose ; the tibiae without spines. The poste- 

 rior spurs rather long, the outer spur curved, and, compared with the inner one, 

 thicker at the base ; they are pure white, and reach to the middle of the metatarsus. 



The male has the antennae longer, of more uniform thickness, and with the third 

 joint not much longer than the fourth, and the puncturing on the thorax coarser. 



The punctuation varies in strength, and in one example the antennae are entirely 

 black. 



sy 4. Mimesa longiventris. (Tab. vm. fig. 18, ? .) 



Nigra, mesonoto et scutello striolatis ; tarsis testaceis ; abdomine quam thorax duplo longiore, dense piloso ; 



alis hyalinis, brevibus. $ . 

 Long. 12 millim. 



Hab. Mexico, Atoyac in Vera Cruz (H. H. Smith). 



Head shining, punctured on the front, the vertex almost impunctate ; below the 

 antennae densely covered with silvery, above more sparsely with long erect fuscous, 

 hair. Ocelli laterally and behind surrounded by a deep and wide furrow ; a narrow 

 keel runs down from the anterior ocellus. Clypeus moderately convex, the apex 

 broadly rounded. Eyes a little diverging on the lower side ; the ocelli almost forming 

 a triangle. Antennae not much thickened towards the apex, covered with a white 

 microscopic pile; the third joint as long as the first, and about one quarter longer 

 than the fourth. Mesonotum and scutellum coarsely and longitudinally striolate, the 

 latter not so strongly as the former ; median segment coarsely reticulated, and with a 

 large fovea in the basal area, which is not clearly defined ; mesopleurae smooth and 

 shining ; the longitudinal furrow wide and deep. Petiole scarcely half the length of 

 the rest of the abdomen ; the abdominal segments broadly covered with a silvery 

 pubescence at the apex ; pygidial area obsolete. There is a fringe of greyish-silvery 

 pubescence on the pronotum, and a denser and longer fringe on the sides of the 

 scutellum and metanotum ; the apex of the median segment bears long silvery hair. 

 Wings short, only reaching to the middle of the abdomen ; the second cubital cellule 

 at the top about one-third of the length of the third cellule, and shorter than the 

 space bounded by the recurrent nervures ; the first and second transverse cubital 

 nervures are straight; the first recurrent nervure is received somewhat beyond the 

 basal third, the second at about half that distance from the apex. 



v 5. Mimesa monticola. (Tab. Vlil. fig. 19, $ .) 



Nigra, basi tibiarum posticarum late testacea; clypeo late inciso; mesonoto punctato, scutello striolato; petiolo 



quam abdomen fere longiore ; alis longis. $ . 

 Long. 11 millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 



Head shining, strongly punctured ; a depression behind the ocelli ; clypeus projecting, 

 biol. CENTE.-AMEK., Hymenopt., Vol. II., April 1891. tt 





