PROC. ENT. soc. WASH., VOL. 22, NO. 4, APRIL, 1920 77 



Kriechbaumer is obviously the Australian and Oriental proto- 

 type of Apechoneura. 



In the position of the abdomen Apechoneura is more like Labena, 

 in fact, in some species at least, is more extreme in this respect 

 than is Labena ; but in the general form of the body, especially of 

 the abdomen, it is exceedingly like the Rhyssini. 



The position of the abdomen in Labena is subject to an appre- 

 ciable degree of variation within a species. Five specimens of 

 Labena grallator measured with a micrometer showed a variation 

 in the distance of the lower margin of the abdominal foramen 

 above the upper margin of the coxal foramen compared with the 

 dorsal length of the propodeum of from 1 : 3.7 to 1 : 6.2. It should 

 be noted that the Rhyssini have the abdomen inserted somewhat 

 higher than is common among the Ichneimonidae, and it is 

 not especially remarkable that one or more genera should go 

 to the extreme in this respect. The occurrence of such extreme 

 characters as this in two or more groups is not particularly 

 rare. As examples may be cited the toothed hind femora of 

 Odontomerus and Prislomerus, genera not at all closely related 

 to each other but closely related to other genera without 

 toothed femora; the carapace form of abdomen which occurs 

 in several widely separated places in the Braconidae and Ichneu- 

 monidae ; the strongly convergent eyes found in widely separated 

 genera of Ichneumonidae; and the wingless and ant like form 

 of the female in the Gelini and in the Stilpinine genera 

 Thaumatotypus and Thaumatotypidea. 



The general shape of the head is perhaps more like that of the 

 Labenini, especially Grotea, but the resemblance is largely super- 

 ficial, for the clypeus and the immargined occiput are Rhyssine 

 and the position of the junction of the occipital and gular carinae 

 is more nearly that of the Rhyssini than that of the Labenini. 

 The tooth on the lower posterior side of the head is not homologous 

 with that of Grotea, for while in Grotea it is formed at the junction 

 of the two carinae, in Apechoneura it is in the area between the 

 carinae. 



Apechoneura has the mesoscutum and scutellum distinctly 

 Rhyssine in character, while those sclerites in Grotea are very 

 similar to those of Labena. 



The venation of the wings in Apechoneura has some features in 

 common with both the Labenini and the Rhyssini. The form of 

 the areolet is about midway between Labena and Megarhyssa. 

 According to Morley's key 1 at least one of the species of Apecho- 

 neura has the discoidella originating almost at the top of nervellus 



1 Rev. Ichn., Part II, 1913, p. 23. 



