458 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 54. 



enceSj should be changed from " Hylechthridae " and " Hylechthrus "' 

 to " Hylecthridae " and " Hylecthrus " to agree with the original 

 spelling. The original description cites the Greek origin of the 

 word, which should have properly been spelled Hylechthrus. 



13. Genus HYLECTHRUS Saunders. 



LIST OF SPECIES. 



1. H, rubi Saunders; parasite of Prosopis inibicola Saunders; 

 Epirus. 



2. H. quercus Saunders; parasite of Prosopis gibha Saunders; 

 Epirus. 



3. E. sieboldii Saunders ; parasite of Prosopis variegata Fabricius, 

 Epirus. 



1. HYLECTHRUS RUBI Saunders. 



Errata : Gen. Insect., p. 18, line 23, add " PI. 1, numbered figure." 



VIII. Family XENIDAE Semenov. 



Tahle of subfamilies. 



1. Male nietathoracic scutellum broadly truncate in frorit, not pedunculate; 



postlumbium more than half as long as wide. Parasites of Apoidea 2. 



Male nietathoracic scutellum pedunculate anteriorly, postlumbium short 

 and transverse ; maxillae two-jointed ; oedeagns inflated at basal angle, 

 sharply angulate at apical third. Female with four median genital tubes 

 entering brood canal 3. Xeninae Pierce. 



2. Male maxillae simple, two-.iointed ; oedeagus not conspicuously inflated at 



basal angle, sharply angulate at apical third. Female with five median 



genital tubes entering brood canal 1. Halictoxeninae Pierce. 



Male maxillae three-jointed ; oedeagus beginning as a slender tube, then 



• gi'eatly inflated, bent at right angles and produced as a very slender 



process 2. Cbawfordinae Pierce. 



1. Subfamily Halictoxeninae Pierce. 

 7' able of genera. 



Male maxillae with first joint longer than second ; oedeagus strongly arcuate 

 beneath at middle 14. Halictoxenos Pierce. 



Male maxillae with first joint shorter than second, oedeagus not strongly 

 ai'cuate beneath at middle; wings with two detached branches of radius 

 and two of raedius, between radius and medius 15. Apractelytra Pierce. 



14. Genus HALICTOXENOS Pierce. 



Table of subgenera. 



Female cephalotliorax triangular, narrowly and roundingly truncate at apex, 

 obviously constricted at base of head ; breadth of cephalothorax at widest 

 point 1.9 to 2.3 times as wide as breadth of head at base. Parasites 

 of Chloralictus 1. Halictoxenos Pierce. 



Female cephalothorax less apparently triangular, broadly and evenly rounded 

 to apex, with very slight sinuations at sides ; breadth of cephalothorax at 

 widest point 1.4 times as wide as breadth of head at base. Parasites 

 of Evylaeus 2. Halictophihis Pierce. 



