STUDIES IN THE FOSSORIAL WASPS. 725 



males being placed in Anthohosca in the Thynnidse, and the 

 females in Cosila among the Scoliidas. Guerin used both 

 names in the same work, but although he placed Cosila 

 chilensis correctly, with the Scoliidpe, he failed to see the 

 relationship to Anthobosca australasice which he had described 

 in an earlier portion of the same work and classed with the 

 Thynnidse. 8mith in 1868 placed a single male in his 

 genus Bimorphoptera, which is a synonym of Cosila, but both 

 before and after placed other males in Anthohosca among the 

 ThynnidjB. He also described both sexes of A, albomaculata Sm,, 

 wliich were taken coupled by Bates, as Myzine, but this work was 

 published after his death and without his revision. Burmeister 

 also in 1876 correctly associated the sexes, but placed his species 

 in Myzine. Although three or four males had been correctly 

 associated with the females, they do not appear to have been 

 connected in any way with the males described in the genus 

 Anthohosca till my revision of the Australian species of the 

 genus appeared in 1907. The best work on the genus was done 

 by Saussiu'e in 1892; but he treated the males as unknown, 

 except in the case of chilensis^ and did not connect Cosila with 

 Anthohosca. In Dalla Torre's great Catalogue, published in 

 1897, there is much confusion in regard to this genus, species 

 appearing under the genera Thywuus, Myzine, and Cosila. There 

 is much confusion over the genus in the receub papers of Cameron 

 on South African Hymenoptera. Ashmead treats the group as a 

 family, Cosilidfe, not as a subfamily of the Scoliidse, which I 

 consider the more natural course. But he places Anthohosca in 

 the Thynnidaa and Dimorphop>tera in his family Myzinidte. H© 

 includes in his family Cosilidaa several genera of dovibtful 

 affinities, of which, in my opinion, Nursea should be treated as 

 an aberrant genus of the Sphecoidea, whilst Maurillus belongs to 

 the Pompilidpe. The position of Sierolomorpha and Ditrogenium 

 seems to me very doubtful, but I have not seen specimens. I am 

 compelled to look on Anthohosca as the only genus which can 

 be placed in the subfamily Anthoboscime with any certainty. 

 Ashmead states that the intermediate coxse in his Cosilidfe are 

 contiguous or nearly so ; but this is quite incorrect as to the 

 females, and even in the males the separation is quite distinct. 

 In my key to the species I have included several species which I 

 liave not seen, one or two of which may possibly not belong to 

 the genus. 



The females are distinguished from other Scoliidse by the 

 absence of a deep groove between the two basal ventral segments 

 of the abdomen. The hind coxee are separated as in Tiphia, 

 not contiguous as in Elis ; but the intermediate coxae are less 

 widely separated than in either of those groups, though very little 

 less so than in Elis. The males are distinguished from all other 

 Scoliidfe by the imarmed rounded hypopygium — in this character 

 approaching most nearly to the Thynnidas of the genus Eirone. 



