hymenoptera. 293 



63. Larrada tenuicornis. B.M. 



Female. Length 6 lines. — Jet-black and sbining, not pubes- 

 cent ; the head and mesothorax very closely punctured ; the 

 anterior margin of the clypeus highly polished, and with a few 

 large punctures ; the antennas slender and elongate, longer than 

 the head and thorax ; the metathorax transversely strigose, and 

 having a central longitudinal slightly impressed line, which ex- 

 pands into a broad shallow fovea at the verge of the truncation ; 

 the latter obhque, with a large fovea above, from which emanates 

 a narrower impressed line, which runs down to the base ; wings 

 dark brown ; the apical joints of the tarsi obscure rufo-testaceous. 

 Abdomen elongate, very acute at the apex. 



Hab. California. 



64. Larrada arcuata. B.M. 



Female. Length Ah lines. — Black : the face with silvery pubes- 

 cence; the mesothorax subopake; the scutellum shining and 

 finely punctured ; the metathorax with an arcuate striation, the 

 striation curving forwards, interrupted in the middle by a longi- 

 tudinal carina which runs to the verge of the truncation; the 

 latter has a small triangular shape crossed by coarse arcuate 

 striae, in the middle of ivhich is a deep fovea"; from the fovea 

 a carina nms downwards to the base; on each side of the 

 carina the truncation is smooth, and covered with silvery-white 

 pubescence ; wings subhyaline, with a faint cloud at their apical 

 margins ; the two apical joints of the tarsi obscure rufo-testaceous. 

 Abdomen smooth and shining, with the apical segment rugose. 



Hab. Canada. 



Genus 2. LARRAXENA. 

 Larraxena, Smith, Ann. Sf Mag. Nat. Hist. ser. 2. vii. 30 (1851). 



L Larraxena princeps. B.M. 



Larraxena princeps. Smith, Ann. Sf Mag. Nat. Hist. 2ndser.vii. 30. 

 Hab. Brazil. 



Genus 3. MORPHOTA. 



Head compressed, a little wider than the thorax; antennfe 

 filiform, inserted at the base of the clypeus ; the vertex slightly 

 convex, the ocelli ])laced in a triangle forward on the vertex ; 

 eyes large, oval, lateral, their inner orbit straight ; the mandibles 



