HYMENOPTERA. 



17 



42. ZETHUS VARIEGATUS. 



Zethus variegatus, Sauss. Mon. Guepes Sol. 13. 9 J , 

 Hob. Mexico. 



43. ZETHUS GRACILIS. B.M. 



Male. Length 4- lines. Black : the head and thorax coarsely 

 punctured ; between the antennae a transverse ridge, from the 

 middle of which a carina runs downwards, terminating about 

 the middle of the clypeus ; a line on the scape in front, and an 

 obscure spot at each extremity of the ridge between the antennae, 

 yellow. The metathorax with a deep central longitudinal im- 

 pression, the sides of which are obliquely striated ; the wings 

 hyaline and iridescent, a fuscous stain along the anterior margin 

 of the externo-medial cell, arid the apical half of the marginal 

 cell clouded. Abdomen covered with a beautiful reflective silky 

 pile ; the apical margin of the petiole and also of the following 

 segment with a narrow yellow fascia ; the swollen portion of the 

 petiole with large scattered punctures. 



Hab. Mexico. 



44. ZETHUS L^VINODUS. B.M. 



Female. Length 9 lines. Black : the head strongly punc- 

 tured, the punctures on the vertex scattered ; the clypeus lon- 

 gitudinally rugose-striate, the striations irregular, the anterior 

 margin rounded, slightly notched in the middle ; the mandibles 

 with deep coarse longitudinal grooves. Thorax : shining, with 

 a few fine distant punctures above ; the anterior margin of the 

 prothorax sharply elevated, the lateral angles acute ; the meso- 

 thorax with an abbreviated carina in the middle in front, and on 

 each side with a deeply impressed longitudinal line extending 

 from its anterior margin to the scutellum, the lines towards the 

 scutellum parallel, but diverging towards the anterior margin; a 

 short impressed line over the tegulae; the metathorax opake, 

 the sides rounded and with a deep longitudinal impression in 

 the middle ; covered with silky pubescence ; a spot at the lateral 

 angles of the prothorax, another beneath the wings, and an inter- 

 rupted line on the post-scutellum, yellow ; the wings dark brown, 

 with a rich purple iridescence, the posterior wings paler. Abdo- 

 men very smooth and highly polished. 

 Hab. Mexico. 



