THE CANADIAN ENTOMOLOGIST. 151 



and IV larger, the two latter being greater than a spiracle; on joint 

 ten IVa is as large as IV, and I and II are more quadrately placed 

 than occurs anteriorly; on twelve these are especially large and 

 almost confluent; anal and its preceding plates black, and form a 

 heavy armature to the posterior extremity. 



This instance of a black anal plate becomes a specific feature 

 paralleled only with cerussata. The larval period seems about 

 sixty days. 



The pupa is of the stout, active form normal to the group, 

 with a period of about thirty days. The dates for emergence in a 

 series of fifty-five specimens are Aug. 26 to Sept. 5. 



The male genitalic modifications, noted already by Smith, 

 might be suggestive of departures with the female structures to 

 meet some special requirement in placing the egg, but other than 

 a slightly longer ovipositor, there seems no change from the preva- 

 lent type. This modification exists in the peculiar two pronged 

 clasper, which is unique absolutely. The eggs which are placed 

 in September hibernate and are likely deposited near the extremity 

 of the branches so the emerging larva may be near the food supply. 

 Parasitism has not been observed so far. The sap beetle, Ips 

 quadriguttatus, occurred numerously in the deserted galleries. 



Explanation of Plate IV. 

 Fig. 1 — Papaipema furcala, male. 

 Fig. 2 — Papaipema fiircata, female. 

 Fig. 3— Papaipema furcata, larva, stage IV. 

 Fig. 4 — Papaipema furcata, larva,, mature. 

 Fig. .5 — Papaipema speciosissima, male. 

 Fig. 6 — Papaipema speciosissima, female. 

 Fig. 7 — Papaipema speciosissima, larva, stage IV. 

 Fig. 8 — Papaipema speciosissima, larva, mature. 



