620 M. Charles Janet on the Relations of 



northern and soutliern relatives. And, lastly, they present 

 some features of their own. As an obvious conclusion, we 

 must expect that at some future date ir will be possible 

 to show that canadensis, annectens, and enhydris are but 

 subspecies of a single species. 



]\Ieasurements of the skull of the type ( c? ) in millimetres : — 



Basal length 106*2 ; greatest breadth 79-8 ; cranial breadth 

 63*5; breadth between upper canines 30 ; interorbital breadtli 

 26 ; greatest posterior breadth 77-2 ; palate length 48*7. 



Hah. Terro Tepic, Kio de Tepic, .TaHsco, Mexico. Coll. 

 Dr. A. C. Bullen, Jan. 1891. 



Type Brit. Mus. no. 92. 3. 17. 8. 



LXIV. — On the Relations o/" Antennophorus Uhlmanni, 

 Ealler, to Lasius mixtus, Nyl. By M. Charles Janet *. 



AifTENNOPHORvs UsLMANNi is au Acarid which was described 

 in 1877 by Haller from specimens found in Switzerland in a 

 nest of Lasius niger. Since that time this species has been 

 found by Karpeller in Hungary in a nest of Lasius umhratus. 

 These two references arc the only ones with which I am 

 acquainted. No observations have been made up to the 

 ])resent on the habits of this creature. 



I have found it in abundance in the garden of the Villa des 

 Eoses, near Beauvais, in a splendid nest of Lasius niixtus, 

 and I took advantage of the opportunity to set up a nest for 

 observation, which has enabled mc to ascertain the relations 

 of this parasite with its host. 



Antennoj)horus Uhlmanni lives as an epizoon upon Lasius. 

 It fixes itself on the lower surface of the head or on the sides 

 of the abdomen of its host by means of the carunculaj in 

 which its feet terminate, and wiiich are furnished with a 

 very adhesive sticky substance. 



I'liese parasites are blind, but the first pair of feet is trans- 

 formed into long antcnniform ajipendagcs provided with very 

 sensitive oltactory organs. They do not wander about in the 

 galleries of the nest, but walk over the bodies of the ants, 

 passing from one to another. When an AntennophoruSy 

 detached from the body of an ant, lies upon the soil in one of 

 the galleries of the nest, it raises and stretches forward its 

 first pair of ambulatory feet, and at the same time explores 

 the space around it with its long antennit'orm feet. These 



• ' Comptes Rendus,' 1897, t. cxxiv. pp. 583-586. 



