ECONOMY OF THE ICHNEUMONID MONOBLASTUS PALUSTRIS. 87 



It should be added that T. nebulosa and T. risi appear to be 

 widely distributed in Continental Europe. 



In connection with this paper I have to express my tha.nks 

 to my ever-obliging friend, Dr. Fr. Ris, of Eheinau, who in the 

 midst of much more important work kindly took the trouble to 

 make preparations of a series of wings, and to photograph 

 them. To British entomologists wishing to identify any speci- 

 mens of Tceniopterijx they may meet with, these wing-photo- 

 graphs cannot fail to prove most useful aids. 



EXPLANATION OF PLATES. 

 Plate II. 

 Fig. 1. — Tcsniopteryx trifasciata. Pict. (Klap.), from Vienna. 

 ,, 2. — T, braaeri, Klap., from Karlin, Prague, Bohemia. 

 ,, 3. — T. putata, Newman, from Scotland. 

 ,, 4. — T. kempnyi, Klap., from Dietikon, Switzerland. 

 ,, 5. — T. risi, Morton, from Scotland. 



In each case, apex of abdomen of S' from above. 

 *a. Apex of dorsal appendage of supra-anal lobus, from 

 above, more enlarged. 5 6. One of the cerci of T. risi, 

 from above (more enlarged), from another specimen. 

 ,, 6. — T. 7iebulosa, Linn., from Scotland ; apex of abdomen of male 



from above. 

 ,, 7. — T. nebulosa, from Lower Austria ; apical process of valvula 

 sub-analis (?). 



Plate III. 

 Fore loings of Male. — Fig. 1. T. nebulosa (micropterous form) (nat. 

 length, 4-8 mm.). 2. T. risi (nat. length, 10-7 mm. i. 3. T. putata (nat. 

 length, 6*7 mm.). 



Fore wings of Female. — Fig. 1. T. nebulosa (nat. length, 12-1 mm.). 

 2. T. risi (nat. length, 11-4 mm.). 3. T.piUata (nat. length, 13"1 mm.). 



* "a" accidentally dropped from smaller fig. 5. 



ON THE ECONOMY OF THE ICHNEUMONID 

 MONOBLASTUS PALUSTRIS, Illgr. 



By Rupert Stenton, F.E.S. 



On June 10th of last year a female was brought to me 

 of the above Tryphonid, which had been observed by its captor 

 to oviposit in a larva of Emphytus cinctus, L. On a supply of 

 these sawfiy larvae being obtained — an easy matter, as they are a 

 serious pest in this Heme Hill district to those possessing valued 

 varieties of roses — and one of them being introduced to the 

 ichneumon, parasitization almost instantly followed. This was 

 effected close behind the head, the operation occupying a few 

 seconds, the larva not making the slightest outward show of 

 objection, though this was certainly exceptional I afterwards 

 found, because a considerable number of larvae were parasitized 

 by this and another female of the same species during the next 



