534 M. W. R. de V. GRAHAM 



tibialis. 2. E. aethiops $. 3. idem 6 $. 4 E. albipes Lyngen ". I think that the type 

 of albipes is probably a male of Habrocytus dolichurus Thomson. 



Pteromalus excrescentiutn Ratzeburg. Types presumed destroyed. The original 

 description suggests that the species is identical with dolichurus Thomson, parti- 

 cularly the fact that one of the syntypic males was reared with " Eulophus 

 Tischbeinii " [=Pnigalio nemati Westw.] from galls of " Nematus Saliceti " [=Pon- 

 tania proximo, LeP.] on willow leaves. Thomson (1878 : 122) considered that 

 excrescentium was probably the same as capreae (L.) ; but Ratzeburg's description 

 of the female of excrescentium states that the female gaster is one and a quarter 

 times as long as the head and thorax, which agrees better with the female of 

 dolichurvis Thomson, the female of capreae having a relatively much longer gaster. 



Habrocytus dolichurus Thomson. Syntypes on 18 pins. LECTOTYPE, a female 

 labelled " L-d " [Lund], bearing also a tiny pale blue ticket and a label " dolichurus 

 Ths.". 



Britain, Sweden, ? Germany. 



Biology. Recorded (under the name capreae Thomson) by Carleton (1939) as a 

 common parasite of Pontania proxima (LeP.) on Salix triandra L. and S. viminalis 

 L. ; I have seen some of these specimens, which are dolichurus Thomson. Carleton 

 stated that there are probably two broods in the year, emerging from a week to a 

 fortnight after the host. I have reared dolichurus from galls of Pontania proxima 

 on Salix fragilis L. in England, Berkshire, Wytham, 10.vii.1960 ; and from galls of 

 P. bridgmanii (Cam.) on 5. cinerea L., Scotland, Isle of Rhum, 14.viii.1962. I 

 have also swept specimens from foliage of Salix aurita L. and S. purpurea L. ; 

 galls of Pontania viminalis (L.) were common on the latter plant, and the Habrocytus 

 may have been parasitizing that insect. Imagines chiefly July-Sept, (occasionally 

 June). 



Otten (1940 : 186) recorded " Pteromalus excrescentium Ratzeburg as a parasite 

 of Pontania viminalis (L.) in Germany ; his records very probably refer to Habrocytus 

 dolichurus Thomson. 



Habrocytus chlorogaster Thomson 



Habrocytus chlorogaster Thomson, 1878 : 119, 6* ?• 



Type material. Syntypes mounted on 4 pins. The first pin carries a female 

 and a male and bears labels reading " Lund " and " chlorogaster Ths " ; the female 

 is designated LECTOTYPE. 



The lectotype of chlorogaster differs only slightly from females of dolichurus 

 Thomson. It has the median area of the propodeum slightly more transverse 

 (length 20, breadth 38) and the nucha more delicately reticulate, the spiracular 

 sulci deeper, and very strongly punctate ; the scutellum relatively broader (length 

 46, breadth 50) ; the gaster, which is slightly longer than head plus thorax, is rather 

 less acuminate, with the last tergite relatively shorter (length 33, basal breadth 31). 

 These differences are small, but I think chlorogaster may be a valid species. On 



