NOTES ON HYMENOPTERA. 89 



The most interesting captures made in Suffolk were sty- 

 lopized specimens of Halicius ahdominalis and H. ohovata, 

 — these are the first examples of the larger species of the 

 genus which I have seen so attacked; notwithstanding a most 

 diligent search, I failed to obtain the male of the parasite ; 

 I found two bees from whose bodies it had emerged; 

 and, judging from the size of the pupa cases remaining in 

 the abdomen of the bee, I am satisfied of its being a much 

 larger species than any of those tliat have been captured, 

 and believed to have emerged from species of the genus 

 Halicius, Younger students of Entomology, who have 

 never seen striopiz*ed bees, will readily detect the para- 

 site, if the bees are carefully examined; they will observe 

 a distortion, usually of the fourth upper abdominal seg- 

 ment; not invariably the fourth if thei'e is more than one 

 Stylops subsisting upon the bee; I have seen two under 

 the third and one under the fourth, and possess several ex- 

 amples with one under each of those segments. When the 

 protuberance is small, fiattish, pale-coloured, and scale-like, 

 it is the female of the parasite ; should it be that of a male 

 StylopSf it will be dark-coloured, black, or nearly so, and 

 cylindrical in form; exactly resembling the apical portion 

 of a Lepidopterous pupa case ; of course, a miniature re- 

 semblance. 



Of the stylopized HaUcti, I took two males and four 

 females. I do not, therefore, think the parasite can be rare 

 in the vicinity of Lowestoft. 



Several of the smaller species of HaUcti have been ob- 

 served to be attacked by these parasites : the JEL. nitidiusculus 

 most frequently so; also M. minutusy S. (Bvatus, and H. 

 quachnnotaius ; the genus HalictojjJtagus is supposed to be 

 the parasite of these smaller HaUcti, but no Entomoloo-ist 



