64 THE REPORT OF THE No. 33 



Mandibles. The mandibles are situated laterad of the clypeus and labrum ; 

 they are of a dark brown colour, present a rough surface, and are distinctly 

 elevated. 



Antenna. The antennae are pectinate and reach to the tip of the tibia 

 of the second paid of legs. 



Labium. The labium approaches a rectangle in shape. The palps are 

 triangular and very distinct. 



Maxilla. The maxillae are subtriangular and the tips meet about on the 

 same level as those of the labial palps. The lateral extensions are folded and 

 are blunt at the apex. 



The Thorax 



Prothorax. The prothorax is short, has a distinct pronotum which is 

 quadrangular in shape and is bisected by a longitudinal ridge. The patagia 

 are subtriangular. 



Prothoracic Legs. The coxae are exposed. They are located caudad to 

 the maxillae and are contiguous to same. The articulation between the tibiae 

 and tarsi is indistinct. 



Mesothorax. The mesothorax is four times as long as the pronotum. The 

 caudal margin of the mesothoracic spiracle appears as a rugosity situated under 

 the posterior edge of the patagia. 



Mesothoracic Legs. The coxae are caudad to those of the prothoracic legs; 

 the femora are not exposed, the joint between the tibiae and tarsi is located 

 near the tip of the prothoracic legs. The tarsi do not quite reach the apex of 

 theforewings, which extend to and cover the anterior part of the third abdominal 

 segment. 



Metathorax. The length of the metathorax is about that of the pronotum. 

 There is a longitudinal ridge on the meson. The greater part of the meta- 

 thoracic legs is not exposed except a small portion of the coxae appearing near 

 the tips of the prothoracic legs and a few of the tarsal joints projecting beyond 

 the wing covers. 



Only a small part of the hind wings is visible on the dorsum; ventrally, 

 they are covered by forewings. 



Abdomen 



The abdomen is slightly curved toward the posterior end. The curvature 

 is determined by the fixed segments, these beginning at segment 7 in the 

 female and 8 in the male. 



The segments support an armature of large and small processes which assist 

 jthe pupa to reach the exterior. They are divided into three areas, as follows: 



1. The first, or anterior, area is a flanged plate thickly chitinized, and has 

 a row of prominent flattened spear-shaped spines across its posterior border. 

 Under the high power of the microscope, small fine depressions can be seen on 

 its surface. 



2. The second, or median, area is of a thinner chitin. It has a row of fine 

 toothed spines on its posterior border. The surface markings are somewhat 

 elongated and suggest a fibrous structure. 



3. The third, or posterior, area is thinly chitinized and covered with a 

 fine reticulation which may provide for any expansion or contraction of the 

 pupal case. 



