112 PIMPLINE ICHNEUMONIDAE 



The lack of definite sutures separating the plates of the head, 

 necessitates the establishment of artificial boundaries. The 

 vertex will be considered as extending from a line drawn through 

 the posterior ocelli, back to a line from the ends of the sutures 

 separating the genae from the occiput. The lateral limits of 

 the vertex can be definitely fixed, but will be considered as 

 extending to the compound eyes. 



The portion of the head behind the compound eyes, extending 

 from the vertex to the clypeus and back to the occiput, will 

 be considered as the genae. The greatest width of the genae 

 is at the lower border of the compound eyes. They gradually 

 become narrower towards the top of the head. 



The labrum is attached to the clypeus between the front 

 borders of the mandibles. Being attached to the lower and 

 inner side of the clypeus, it leaves the anterior borders of the 

 latter clearly defined. The labrum bears a thick row of long 

 spines on its outer edge. 



The mandibles are situated on either side of the labrum. 

 They are broad at the base, taper gradually toward the apex 

 and the tip is slightly incurved. They have two teeth, the 

 anterior one being blunt, while the posterior one is produced 

 to a point. The maxillae lie behind the mandibles and each 

 has a five-segmented palpus. The labium is so well concealed 

 by the maxillae that it was impossible to separate it for careful 

 study in the time at my disposal. 



The antennae are filiform, long, slender and composed of about 

 forty segments. They are covered by a large number of minute 

 spines. The main portion of the scape is bluntly spindle-shaped 

 when viewed from the mid line of the body, or from somewhat 

 below the point of attachment. From this angle, the fact that 

 the upper, outer side of this spindle has quite a deep, oval exca- 

 vation from which the pedicel arises, is not perceptible. At 

 its widest part, the scape is about twice as wide as the other 

 segments. The bulb below the constriction enlarges so that 

 its outline is triangular. The first segment of the antenna is 

 globular and very much differentiated from the others. It is 

 broader than long and about one-fifth the length of the second 

 segment. The remaining segments are cylindrical and a gradual 

 decrease in size appears on the outer half of the antenna. The 



