OBSERVATIONS, ETC. 41 



the only apterous males that I have seen are those of P. 

 agilis and P. instahilis. I have little doubt of many male 

 Pezomachi being included amongst the species of the genus 

 Hemeteles, the neuration of the wings of the two genera 

 being nearly identical. Ratzeburg mentions the male of 

 Pezomachus fasciatus having been bred from spider's eggs, 

 but I believe it has not been obtained in this country by 

 any one previously. It is a fact worthy of recording, that 

 in June, 1858, I collected an equal number of the spider's 

 nests, but did not succeed in getting a single male of the 

 parasite, although thirty females were developed. 



Pezomachus vulpinus and P. rnicroptems were both 

 found in the nest o^ Formica riifa,xiot reared from cocoons; 

 it is therefore undecided whether they were parasitic on the 

 ant, or merely stragglers in the nest. 



Species of the genus PezomacJius are occasionally parasitic 

 upon the larvae of Lepidopterous insects ; an apparently new 

 species was bred by Mr. Scott from Coleophora saturatella ; 

 and I reared myself, during the past season, the Pezomachus 

 agilis from the larva of a species of Noctua. 



In July last I bred the Chalcididous parasite, 3Ionodon- 

 tomerus dentipes, from the cells of Anthophora acervorumf 

 and also from those of Colletes Daviesana; on several previous 

 occasions I reared them from the cells of Gsmia riifa ; this is 

 another instance corroborative of the opinion, that an Ich- 

 neumon by no means confines its attack to a particular 

 species. 



In addition to the above parasite I also bred Chrysis 

 ignita from the cells of Colletes Daviesana^ having pre- 

 viously obtained it from the nest of Odynerus spinipesy 

 Osmia riifa and Vespa rufa. I also bred Epeolus variegatus 

 from the cells of Colletes. 



Coelioxys simplex has been reared from cells of the leaf- 

 cutting bee Megachile ligniseca, by Mr. B. Newcomb. 



