230 ICKNETJMONID^. 



deeply excavated longitudinally at the base ; the ovipositor black, 

 and less than half the length of the abdomen. 



Hah. Costa Eica, Irazu. 



4. Pimpla lineata. 



Female. Length 5| lines. — Pale yellow, the mesothorax with three 

 longitudinal black lines ; the margins of the segments of the abdo- 

 men have narrow black fasciae ; the ovipositor is also black, and 

 scarcely half the length of the abdomen j the insect smooth, shining 

 and impunctate ; the antennae black, with the scape yellow in 

 front ; wings hyaline, the apex of the anterior pair slightly fus- 

 cous ; the posterior tarsi, and the apical joints of the intermediate 

 pair, black. 



Hah. Costa Rica, Irazu. 



THYREODON, Bridle. 

 1. Thyreodon morosus. 



Female. Length 11 lines. — Black, with the wings dark brown, and 

 having a brilliant violet and purple iridescence. The front with a 

 minute tubercle between the antennae ; the face closely punctured ; 

 the scape and two minute joints at the base of the flagellum black, 

 the following two thirds of the flagellum white, the apical portion 

 black ; the mesothorax with two deeply impressed channels that 

 run longitudinally and unite at the scutellum, the channels crenu- 

 lated ; the metathorax with a longitudinal channel, on each side of 

 which it is obliquely striated and pubescent. The abdomen smooth 

 and shining, and having an obscure violet tinge. 



Hob. Costa Rica, Cache. 



2. Thyreodon principalis. 



Female. Length 11-13J lines. — Black, with the third and fourth 

 segments of the abdomen yellow. The clypeus slightly elevated 

 and pointed at the apex ; the mesothorax with two longitudina 

 furrows that are crenulated and unite at the base of the scutel- 

 lum ; the metathorax with a central longitudinal depression, on 

 each side of which it is obliquely striated ; wings dark brown, 

 with a splendid violet and purple iridescence. Abdomen very 

 smooth and shining. 



Hah. Costa Rica, Cache. 



