THE CANADIAN ENTOMOLOGIST 121 



4  



in intense light but its suture, even in caustic potasii mounts, is 

 not apparent. 



Thorax. — A hea\'y chitinous plate on the dorsal side of each 

 segment and a narrow semicircular piece of heavy chitin above 

 each coxa; the ventral surface is weakly chitini^ed; the legs are 

 robust and heavily chitinized; there is a well-developed tooth at 

 the base of each tarsal claw. 



Abdomen. — A chitinous plate, fig. 1, on the dorsum of each 

 segment, the plate on the first segment is broader than those of 

 the succeeding segments, the plate on the last segment (not ap- 

 parent in the illustration due to the curling of the abdomen) covers 

 the entire top of the segment, extending shelf-like over the last 

 segment, each plate is armed with several small setcc; the 5th 

 segment has a collar-like projection to which the 4th segment is 

 joined, this projection may be telescoped, as in fig 1, or protruded, 

 in the latter position it may easily be mistaken for a distinct 

 segment, but may be distinguished by the absence of a chitinous 

 plate; on each side of the median line on each segment except the 

 last two and apparently the first there is a small circular spot 

 bearing two setae, a similar spot occurs on each side of the same 

 segm.ents, and also on the next to the last segment. 



Pupa. — Length 33^ mm.; the antennae extend back to the 

 caudal margin of the 3rd abdominal segment; each mandible (fig. 4) 

 is connected on its outer margin by two chitinous rods which run 

 obliquely back toward the eye; behind the base of each antennae 

 there is a semicircular brown mark; the first two thoracic segments 

 bear plate-like marks above; the third thoracic and 1st abdominal 

 segments are marked dorsally by a few narrow, apparently chitinous, 

 lines; the last segment lacks appendages. 



Explanation of Plate HI. 



Fig. 1 — Ithytrichia confusa, larva, dorsum. 



Fig. 2 — Ithytrichia confusa, larva, case. 



Fig. 3 — Ithytrichia confusa, larva, labrum. 



Fig. 4 — Ithytrichia confusa, pupa, mandible. 



Fig. 5 — Ithytrichia confusa, larva, mandible. 



Fig. 6 — Ityhtrichia confusa, larva, drag-hook. 



Fig. 7 — Ithytrichia confusa, pupa, chitinous plates of abdomen. 



