54 THAXTER. 



RiCKIA LiSPINI Th. 



This species, which was first recorded from the Argentine, has now 

 been obtained from the Amazon region. No. 2231; from Guatemala, 

 No. 1625; from California, No. 2757 and from Kamerun, No. 2606. 

 It shows little variation, from these diverse regions, except in size, 

 the largest, measuring 150 m in length, being included in the material 

 from the Amazon. The host is in all cases a Lispimis, or belongs to 

 a closely allied genus. 



