This afternoon, Elizabeth Compston of Wells Gardens, valued member of this chatline and tireless advocate of name-tag wearing, asked me to photograph some unusual small ants she had discovered in her cactus garden. The ants appeared to have made a coffee-cup-size nest of fine plant material, matted together, at the base of a cactus plant, They were about 3mm long excluding antennae. Most (not all) had an unusually large abdomen by comparison with the normal run of picnic ant. I said to Elizabeth: “Someone is bound to know about these chaps” … (?)