C(ELIOXYS. 267 



NATIVE SPECIES. 



1. conica, Linnaeus, <$ ? . 4-5 lines. 

 quadridentata, Linnaeus, $ . 

 quadridentata, Kirby, $ . 



2. simplex, Nyland, $ ? . 5 lines. 

 conica, Kirby. 



conica, Curtis, viii. 349. 

 Sponsa, Smith, <$ . 



3. umbrina, Smith, $ ? . 



4. ntfescens, St. Fargeau, r " . 4-6 lines. 



5. vectis, Curtis, <$ ? . 5-6 lilies. (Plate XII. fig. 



!<??-) 



6. inermis, Kirby. 



GENERAL OBSERVATIONS. 



This genus is named from tcoiXia, belly, ot;v<t, acute, 

 in application to the conical abdomen of the female. 

 The insects of this genus are parasitical upon the genera 

 Megachile and Saropoda. Thus, C. simplex infests M. 

 circumcincta ; C. rufescens, M. Willuyhbiella ; C. vectis, 

 M. maritima ; and C. umbrina is parasitical on Saropoda 

 bi/naculata. Linnseus, from the different appearance of 

 the two sexes made two species of them, and from the cir- 

 cumstance of his having described first the male as Apis 

 quadridentata, this, by the law of priority, supersedes the 

 name of C. conica as the name of the species, which is it? 

 female, and which he next described, and thus that sex, 

 whose form Latreille adopted as typical of the genus, is in 

 the series of species totally superseded and reduced to a 

 synonym. The species of this genus are extremely dif- 

 ficult to separate from each other, no tangible character 

 presenting itself conspicuously, although the Swedish 



