106 AMERICAN HYMENOPTERA. 



genus by Spinola), and find the palpi 6-jointed. The male of rufi- 

 collis also has two raised lamiuse or keels on the last ventral segment, 

 as in some of our species of Synhalonia. It also appears that La- 

 trielle, in his original account of Macroeera, said the maxillary palpi 

 were 6-jointed, though the sixth joint was not very noticeable. I 

 am quite unable to see that T. ruficollis Brulle, and T. Incasi Gri 

 bodo (the only Palsearctic species I possess) are not veritable Syn- 

 haloiiia and I therefore substitute Tetralonia for Synhalonia in the 

 check-list. It follows from the above that Tetralonia is not the 

 proper name for T. gabbi and kindred species referred there by 

 American authors. These insects really do appear to have 5 jointed 

 maxillary palpi, and the general appearance is not that of Synha- 

 lonia. Their affinity is rather with Xenoglossa, and with Svastra 

 Holmberg, which Ashmead makes a synonym of Xenoglossa. In 

 the maxillary palpi, Svastra resembles rather that group or subgenus 

 of Xenoglossa which Robertson has named Peponapis, not typical 

 Xenoglossa of Smith ; but I hardly think that these should be geu- 

 erically separated. The palpi of Tetralonia exquisita differ from 

 those of Svastra in the longer terminal joint, and the shorter second 

 joint. All things considered, I think it best to refer T. gabbi and 

 its allies to Xenoglossa in the check list, with the remark that they 

 may hereafter prove separable. 



(18) Synhalonia fitscipes (Rob., 1900) becomes a homonym, be- 

 cause of Tetralonia fuscipes Moraw, 1894. It is not given a new 

 name, however, because it is very likely the female of S. illinoensis. 



(19) The Pennsylvania record of Cerno lo bus ipo7n(ne iKoh.) is 

 based on a specimen from Lehigh Gap, collected in 1902 by Mr. 

 Rehn. 



(20) The Maine record of Melissodes perplexa is from Mr. Lovell. 



(21) The tribe Entechniini is separated on the peculiar mouth- 

 parts. 



