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 A HISTORY OF ESSEX common. A. furcata, which forms its cells in decaying posts, though far from common, may often be heard even before it is seen busily engaged among the flowers of Stacbys syhatica and other labiates. The velvet coated humble bees and their parasites of the genus Psitbyrus, which so closely resemble them, may be met with in all parts of the county during the warmer portion of the year ; but two species are very rare. Of Bombus lapponicus only a single specimen, which was cap- tured on a sea holly flower at St. Osyth, has been found ; it is a moun- tain species, and as far as can be ascertained no other specimen has been recorded from the south of England. B. cullumanus has only been found at Southend, where the late Mr. Frederick Smith took six examples many years ago. A LIST OF THE ACULEATE HYMENOPTERA OCCURRING IN THE COUNTY HETEROGYNA FORMICIDJE Formica, L. rufa, L. fiisca, Latr. race i. cunicularia, Latr. Lasius, Fabr. fiiliginosus, Latr. niger, L. race i. alienus, Forst flavus, De Geer PONERID.* Ponera, Latr. punctatissima, Rog. MYRMICID.S: Leptothorax, Mayr. tuberum, Fabr. race Nylanderi, Ffirst Myrmica, Latr. rubra, L. race laevinodis, Nyl. ,, ruginodis, Nyl. scabrinodis, Nyl. lobicornis, Nyl. Solenopsis, Westw. fugax, Latr. Monomorium pharaonis, L. FOSSORES MUTILLID.S Mutilla, L. europaea, L. rufipes, Latr. Myrmosa, Latr. melanocephala, Fabr. Methoca, Latr. ichneumon ides, Fabr. Southend (F. Smith) TlPHIID-ffi Tiphia, Fabr. femorata, Fabr. Colchester, Southend SAPYGID.*: Sapyga, Latr. quinque punctata, Fabr. POMPILID^ Pompilus, Fabr. unicolor, Spin. bicolor, Lep. rufipes, L. cinctellus, Spin. plumbeus, Fabr. consobrinus, Dahlb. minutulus, Dahlb. spissus, Schiodte chalybeatus, SchiSdte gibbus, Fabr. unguicularis, Thorns. wesmaeli, Thorns. pectinipes, V. de Lind. Salius, Fabr. fuscus, L. afBnis, V. de Lind. Soutbend (F. Smith) exaltatus, Fabr. pusillus, Schiodte. parvulus, Dahlb. Calicurgus, Lep. hyalinatus, Fabr. Pseudagenia, Kohl. carbonaria, Scop. Agenia, Schiodte. hircana, Fabr. Ceropales, Latr. maculata, Fabr. SPHEGID^E Astatus, Latr. boops, Schr. Tachytes, Pz. unicolor, Pz. pectinipes, L. 102