HYMENOFTERA-ACTLEATA. 407 



Heriades, Spin. — This genus contains but one species, of 

 habits similar to Chelostoma. It is very rare in 

 Britain. 



Ccelioxys, Latr. — Another inquiline genus, usually laying 

 its eggs in the previously excavated and pro- 

 visioned cells of Megachile, to which it is struc- 

 turally nearly related. It also attacks Osmia, 

 Anthophora (on the Continent) and Saropoda. 

 Most of the species appear to be more or less 

 promiscuous (always within the limits of the 

 above genera) in choice of hosts. Our British 

 examples of the genus have, however, been 

 specially noticed to associate with the following, 

 viz. : — 



C. vectis with Megachile maritima. 



C. rufescens „ M. circumcincta and Osmia 

 xanthomelana. 



C. elongata ,, M. Ugnesceca, M. willughbiella, 

 M. circumcincta, and Osmia 

 rufa. 



Upon the Continent, at any rate, the para- 

 sitical Cartioxys is in its turn preyed upon by the 

 Dipteron Anthrax, whose grubs devour its larvae ; 

 and both Ccelioxys and Anthrax again are further 

 attacked by the little Chalcid Monodontomerus, 

 whose grubs are nourished at the expense of the 

 flesh and blood of its hosts. 



C. quadridentata, L. — conica, Thorns. — Reported as 

 numerous at Formby, H.H.H. 



C. elongata, Lep. — symjilex, Nyl., Thorns. — Widely dis- 

 tributed in our district. Specially noted at 

 Leasowe ; along the Cheshire coasi, and at South- 

 port, B.C. ; Formby, H.H.H. ; Higher Bebing- 

 ton, J.T.Gr. ; Ince, lt.I\ . ; Delamere, associated 



