March, igio.] BrUES : PARASITIC HyMENOPTERA. 15 



and the femora strongly obclavately thickened. The chelate tarsi 

 and the uniformly lo-jointed antennae occur also in a number of 

 fossil species belonging to several genera found in Baltic amber of 

 Oligocene age, but in a new genus from Borneo, here described for 

 the first time, the tarsi are simple as in two other known genera, and 

 the antennae are 12-jointed. While there can be no doubt that it 

 is closely related to the Dryinidge, it approaches in many respects cer- 

 tain Thynnids like Methoca, but I think this resemblance undoubtedly 

 superficial and that the Dryinids have also been derived from an 

 Ampulicid type. 



Another interesting series forms the subfamily Embolemin?e of 

 Ashmead which he places between the Bethylinae and Dryininge ('02). 

 Of this group the rare genus Ampnlicimorpha Ashm. from western 

 North America appears to be the most generalized form yet dis- 

 covered (Fig. 2). As its name suggests it bears a striking resemb- 



FiG. 2. Ampulicimorpha confusa Ashm. ; wing. 



lance to the Ampulicidre also. In spite of this, however, it really 

 shows less similarity to this family than the types previously dis- 

 cussed. The antennas are 13-jointed, inserted high up on the front, 

 and the form of the metathorax is very much like that of Proctotrypes 

 and its allies. This has already been mentioned by Perkins ('05) 

 who writes : " To me the Dryinidae together with the small and little 

 known subfamily Emboleminae of Ashmead (which may probably be 

 merged in one or the other of these) [Dryinidae or Bethylinae] con- 

 stitute a natural group, synthetic between the old Fossorial series of 

 the Aculeata and the true Proctotrypidse." From a study of Ampuli- 

 cimorpha I have been led to the same conclusion with respect to the 

 relationship of Ampulicimorpha and the Proctotrypidse, but as can 

 be seen from the preceding discussion, not in regard to the Bethylidae 

 in general. With the exception of the wings, which have a very 

 much degenerated venation in the Proctotrypidae, the resemblance is 

 very strong, even to the armature of the male genitalia by a pair of 

 spines in both, and I regard Ampulicimorpha as a remnant of a group 



