156 HTMENOPTEEA. 



slightly concave. Metathorax coarsely and closely rugose, the apex almost reticulated ; 

 tubercles blunt, inconspicuous ; areae obsolete. Petiole smooth, shining, impunctate ; 

 the apex of the postpetiole with some punctures. Gastrocceli large, moderately deep, 

 longer than broad. Abdomen closely punctured ; the base shining, impunctate ; the 

 apex finely punctured, acuminate ; sheath broad, projecting, issuing from the base of 

 the sixth segment, pilose, the apex black. The head and thorax are sparsely pilose ; 

 the hair on the metathorax is longer than on the mesothorax, that on the abdomen is 

 much closer and longer, especially at the apex. The metathorax is tinged with yellow, 

 as are also the belly, the pronotum, and the legs at the base ; the tubercle beneath 

 the wings is also yellow; the apical joint of the posterior tarsi is black. Wings short; 

 areolet 5-angled ; stigma testaceous ; nervures blackish. 



42. Ichneumon causticus. (Tab. VIII. fig. 3.) 



Rufo-testaceus ; flagello antennarum nigro, medio laete albo, orbitis oculorum flavis ; alis subfumatis, stigmate 



testaceo. $ . 

 Long. 13 millim. 



Hab. Guatemala, Zapote (Champion). 



Antennae semi-involute, thick, the third joint a very little longer than the fourth. 

 Head not buccate, the front but little projecting ; clypeal foveas deep. Head and thorax 

 closely, the pleurae longitudinally, punctured. Scutellum flat on the disc, the sides 

 carinate. Metathorax with a gradual slope ; the arese distinct ; the supramedian area 

 broader than long ; the tubercles blunt. Petiole long, straight, and shining ; postpetiole 

 with a few punctures. The rest of the abdomen shining, and finely punctured. Gas- 

 trocceli shallow. Legs stout ; coxae punctured. Areolet 5-angled, narrower above ; its 

 outer nervure almost obsolete. 



Almost identical in coloration with I. salvini, but a broader and stouter insect. 

 The antennae are stouter, and not compressed and dilated beyond the middle ; the 

 abdomen is shorter and broader ; the petiole is longer ; the metathoracic areae are all 

 distinct ; and the wings have a well-marked smoky hue. 



43. Ichneumon additus. 



Ichneumon additus, Cresson, Proc. Acad. Phil. 1873, p. 114. no. 12 (<?) \ 

 Hab. Mexico, Orizaba x (Sumichrast). 



— - 44. Ichneumon citrinus. 



Ichneumon citrinus, Cresson, Proc. Acad. Phil. 1873, p. 114. no. 13 {SY- 

 Hab. Mexico, Orizaba 1 (Sumichrast). 



45. Ichneumon izucarus. 



Ichneumon izucarus, Cresson, Proc. Acad. Phil. 1873, p. 114. no. 14 ((J, $ Y. 

 Hab. Mexico, Orizaba, Cordova 1 (Sumichrast). 



