56 Fritz Johansen and I. C. Nielsen. 



Hymenoptera. 



From East Greenland 20 species of wasps were hitherto known, 

 of which only 4 (5) are present in the collections, which further 

 contain two species not previously taken in East Greenland (Praon 

 sp. and Nematiis sp.), and of these the latter is new to the Green- 

 land fauna. 



1. Nematus sp. 



One specimen (Ç). Beginning of July 1908. 



From Greenland we now know in all four species of Chalasto- 

 gastra, of which however only one specimen of each has been 

 brought home, namely, from the w^est coast Nematus obductus Htg. 

 and a species described by Marlati ^ from Disco, N. borealis, of 

 which only the type-specimen is known, and from the east coast 

 two specifically distinct females, both of which probably belong to 

 undescribed species. 



2. Ichneumon groenlandicus Lbck. 

 One specimen. 1. July 1908. 



3. Limneria Deichmanni Nielsen. 



This species seems to be very common and to cause no little 

 destruction among the larvae of Dasychira groenlandica. 



The wasp lays its eggs on the one-year old Dasychira larvae, 

 and these do not increase appreciably in size afterwards; they over- 

 winter as usual, appear next spring and begin to eat, but are then 

 killed by the parasite. I have already mentioned^ that the larva of 

 the parasitic wasp spins cocoons inside in the empty skin of the 

 host larva after boring a hole through the underside of this, and 

 through the hole it attaches the cocoon firmly to some understra- 

 tum, Dryas-plant or grass. Such fast-spun cocoons were collected 

 in the first days of June, and the wasp was hatched out on the 

 14th of the same month. 



4. Microgaster sp. 

 Some empty cocoons. 



5. Praon sp. 



An Aphis was found attached to a stone by means of an empty 

 wasp cocoon, with the form characteristic of the genus Praon, a 

 short cone, on the truncated point of which the skin of the leaf- 

 louse was attached. No species of this genus has hitherto been 

 known from East Greenland; on the other hand, Praon objectiis 



1 Proceedings of the Academ}^ of Science of Philadelphia 18Я2, p. 133. 

 . - I. C. Nielsen: 1. с p. 387. 



