78 ENTOMOLOGICAL SOCIETY 



Family IV. HvLECHTHRiDyE Pierce. 



Wings having seven primary veins from base, with two distal un- 

 attached veins between the third and fourth, and one between 



the fourth and fifth Hylechthrus Saunders, 1850. 



Type of genus, Hylechthrus rubi Saunders, 1850, parasitic on 



Prosopis ruhicola Saund., Epirus. 

 Described species : 



quercus Saunders, 1850, parasitic on Prosopis gibba Saund., 



Epirus. 

 sicboldii Saunders, 1852, parasitic on Prosopis 7'aricgata Saund., 



Epirus. 

 rubi pustulatus Saunders, 1872. 



Family V. Xenid^ Semenov, 1902. 



1. Maxillas unilobed 2 



Maxillae bilobed 3 



2. Maxillae two-jointed Xeninse, n. subfam., 4 



Maxillas three-jointed Homilopinae, n. subfam., 12 



3. First lobe of maxillae three-jointed, second one- jointed, 



Crawfordina?, n. subfam., 13 



Subfamily Xeninae Pierce. 



4. Wings having eight primary veins from base 5 



Wings having seven primary veins from base 11 



5. Wings having two distal unattached veins between the third and 



fourth primaries 6 



Wings having two distal unattached veins between the third and 

 fourth primaries, and one unattached vein between the fourth and 

 fifth primaries 10 



6. No distinct node on costal margin 7 



Distinct node, or notch, on costal margin 9 



7. Antennae tapering to tips of ramae, short, hardly longer than head, 



ramae equal, deflexed, compressed, somewhat ensiform; 

 wings having eight primary veins from base, with two distal 

 unattached veins between the third and fourth ; oedeagus 

 arising between two reflexed claws, broad at base, strongly 



reflexed toward apex, apically acute Xenos Rossi, 1790. 



Type of genus, Xenos vespariim Rossi, 1790, parasitic on 



Polistes galliciis, Italy. 

 Described species : 



rossii Kirby, 1813 = vesparum Rossi, 1790. 

 jurinei Saunders, 1872, n. nom. pro vesparum Jurine, 1818, 

 parasitic on Polistes galliciis, Switzerland. 

 Antennas foliaceous, bluntly rounded at tips of ramae (oedeagus not 



