120 



1. Head of larval céphalothorax with a constriction in front of 

 the transverse genital slit. Mandibles marginal with one apical 

 tooth. Spiracles ventral not visible on the lateral edge. The 

 dark band on the first ventral abdominal segment is half 

 circle shaped. All tarsi of the triungulinid larva acute. 



.... H. Nassonovi Pierce 

 (Germany). 



l**. Head without constriction in front of the transverse genital 

 slit. Mandibles bilobate. Spiracles lateral. The black band 

 on the first abdominal segment ventrally is square with two 

 emarginations at posterior angles. The four fore tarsi of the 

 triungulinids larva flattened and slightly expanded to the 

 rounded end. 



.... H. nitidiusculus m. n. sp. 

 (England, Czechoslovakia, Poland, S. W. Russia). 



Genus Pseudoxenos Saunders. 



Pseudoxenos shaumii Saunders. 



This species known as yet from one male specimen described 

 by Saunders from Corcyra is a parasite of Odynerus (Ancistro- 

 cerus) parietum L. 1 received one male of Ancistrocerus parietum. L. 

 taken by Mr. J. Noskiewicz at Mielnica 20. VIII. 1922, which 

 contains four male puparia, one female adult larva (strongly da- 

 maged) and one damaged skin of triungulinid larva. 



Male. L. 2,1 mm. The third and forth antennal joints densely 

 covered with cylinder- shaped sensillae and among these with 

 triungular scales, which are apically produced in a long spine. 

 PI. 111. Fig. 6. A. B. C. D. Length of antennal joints respectivelly : 

 0,07 mm. ; 0,04 ; 0,54; 0,54. Br. of antennal joints respectivelly: 

 0,09 mm. ; 0,08; 0,1 ; 0,09. The second antennal joint, which is the 

 shortest, is twice as broad as long. Third joint equal to fourth. 

 Mandibles slightly curved, ensiform, flattened, brownish black 

 at the base yellow and translucide at the apex. L. 0,23 mm. Br. 

 at the base 0,058 mm. at the middle 0,029 mm. Fig. 5 C. 



Maxilla f as long as the palpus ; brownish, densely covered 

 with minute hairs. L. 0,131 mm. Br. 0,058 mm. Palpus slender 

 subcylindrical. L. 0,182 mm. Br. 0,043 mm. PI. 111. Fig. 5 D. Head 

 transverse produced in front, this production is divided in three 



