THE CANADIAN ENTOMOLOGIST. 207 



a single larva. In view of the recent work on polyembryony in several 

 HymenopteroLis parasites, it is interesting to note that this does not occur 

 in the development of Apanteles glomeratiis. 



Seurat observed what he considered the moulting of these larvse while 

 still within their host, but Kulagin, '92 (Zoologischer Anzeiger, Vol. XV, 

 pp. 85-87), who studied their embryological development, states that they 

 do not moult till they emerge from their host. In none of the sections 

 which I examined, did I find any indications which would go to show 

 that they moulted while within the host. 



At time of emergence from the host the stigmatic trunks, with the 



exception of the second pair, open to the exterior. About two days later 



they moult inside the cocoons, changing to the pupal state. The pupal 

 period lasts from five to ten days, varying in length according to weather 

 conditions, being longer when the temperature is low. Tiie adults emerge 

 by cutting a circular lid at one end of the cocoon and pushing it oft'. They 

 live, in all probability, only a sliort time. Those reared in confinement 

 lived only a {t\'^ days, in most cases all would be dead on the sixth day 

 after emergence. 



This parasite is, undoubtedly, of great economic importance in 

 destroying large numbers of the larvae of the cabbage butterfly. Chittenden 

 records in Bull. 54 of the U. S. Dept. of Agriculture a case of complete 

 parasitization in a large number of Pieris larvae examined. During the 

 summer of 1906 I visited several small cabbage fields at various intervals 

 from June till the last of October. During the early part of the season 

 the number of caterpillars parasitized was very small, but later, in July 

 and August, sometimes neaily 50 per cent, of those brought in would be 

 parasitized. In September and October the majority of the lirvte 

 examined were parasitized, probably on the average between 60 and 75 

 per cent, at that season of the year. 



A xNEWPHORIl) GENUS WITH HORNY OVIPOSITOR, 



BV D. W. COQUII.LETT, WASHINGTON, D. C. 



Among the Dipterous family Phoridse is a small group, characterized 

 by the females having a large, exserted, horny ovipositor. This group is 

 represented on this continent by two described genera, Apocephalus from 

 North America, and Melaloncha from South America. To these is now 



June, 1907 



