hymenoptera. 293 



63. Larrada tenuicornis. B.M. 



Female. Length 6 lines. — Jet-black and sinning, 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 antennee 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 4^ 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 which is a deep fovea ; from the fovea 

 a carina runs 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. SfMag. Nat. Hist. ser. 2. vii. 30 (1851). 



1. Larraxena prixceps. B.M. 



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

 Hab. Brazil. 



Genus 3. MORPHOTA. 



Head compressed, a little wider than the thorax; antennge 

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

 convex, the oceUi placed in a triangle forward on the vertex ; 

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



