14 Silverlock : Some Aculeate Hymenoptera of Halifax. 



family was Pompilus gibbiis, captured on a hard sandy hank 

 near Copley. 



Fam. Sphegidae — four species, Crabro dimidiatus, C. anxius, 

 C. elongatulus and C. palmipes. This is a very small number, 

 but I left Halifax at the end of July, and August is certainly 

 their best month. 



DiPLOPTERA : — 



Fam. Vespidae — these are the true wasps as distinguished 

 from the sand-wasps {Fossores). 



V. vulgaris and Germanica, both equally common ; V. 

 norvegica, only once seen near Copley. 



Anthophila : — 



Fam. Andrenidae : 



Genus Sphecodes : two comparatively rare species — S. retic- 

 ulatus and similis — were taken. More species are no doubt 

 to be found, as their hosts belonging to the genus Andrena 

 are well represented. 



Genus Halictus — leucozonius, cylindricus, ruhicundus and 

 Freygessneri melanea has the sculpturation of the abdomen 

 markedly different from that of the southern type. 



Genus Andrena — well represented by A. albicans, Clarkella, 

 cineraria, lapponica, fucata, rosae (var. trimmerana) , angustior, 

 fiilva, albicrus and minutula. These are nearly all spring bees ; 

 Clarkella being out early in April. Strangely enough, A. 

 lapponica, although only added to the British list fourteen years 

 ago, was taken plentifully on whortleberry. 



Genus Nomada — all species of this genus are parasitic on 

 members of the last-mentioned genus. N. Lathbnriana, Fabri- 

 ciana, ruficornis and bifida were taken ; Lathburiana at Hebden 

 Bridge, the others at Copley. The specific name ' bifida ' has 

 reference to the mandibles which at once distinguish this 

 species from ruficornis, which has the mandibles simple and 

 pointed. 



Fam. Apidae : — 



Genus Bombus — agrorum, hortorum, pratorum, venustus, 

 lapidarius, Derhamellus. 



The species pratorum is partial to the flowers of the bramble, 

 and may always be found near clumps of the latter. 



In conclusion I must thank Mr. Edward Saunders for his 

 kindness in determining doubtful species, and in answering my 

 numerous questions on habits and structure. 



Naturalist 



