Nothing, so far as I am aware, is known of the habits of these singular insects, which, I believe, have been caught only three times in this country and then only the male sex. The first, which is in the collection of the British Museum, was brought by Dr. Leach from Devonshire; the second was caught in the New Forest by the late John Walton, Esq., distinguished for his knowledge of the British _Curculionidæ_, and who kindly presented it to me for my collection when I was at the zenith of my enthusiasm for the Hymenoptera, and with that collection it passed to Mr. Thomas Desvignes, in whose possession it remains; and the third was caught by Mr. Stevens, at Weybridge, in Surrey. Why I enter so particularly into these circumstances is, that the genus is extremely peculiar both for scientific position and for structure. In the latter the male is extremely like the male of _Saropoda_ and its female is more like the female _Scopulipedes_ among the _Apidæ_ than one of the _Andrenidæ_, especially in the form of the abdomen and of the intermediate and posterior legs, as well as in the length of the claws and the low insertion of the posterior joints of the tarsi upon their plantæ, a peculiarity not occurring in another genus of the _Andrenidæ_. I have no doubt, also, that they are very musical in their flight and are, perhaps, as shrill-winged as is _Saropoda_; whereas one of the great characteristic specialities of the _Andrenidæ_ is their silence. This genus, although restrained within the circuit of the subnormal bees by the structure and folding of its tongue, has so much of the habit of one of the true _Apidæ_ that it almost prompts the wish to resuscitate the circular systems and place it within its own circle in analogical juxtaposition to _Saropoda_ in the circle of the _Apidæ_, where they might impinge one upon the other. It is not often that so rare an insect is at the same time so curious and so suggestive. Having been found, there is no reason why it may not be again found with due and patient diligence; my own experience has taught me how easy it is even in well-hunted ground to make rarities common, within almost a stone’s throw of the metropolis, at Hampstead, Highgate, and Battersea, from which localities in the course of my entomological career I have introduced to our fauna many novelties, one of which was certainly a remarkable discovery, from the last spot named, which it is worth recording. A quantity of soil had been removed from the City where an artesian well was being bored, and consequently from varying depths, and carted thence and cast upon the edge of the river-bank at Battersea. The following season, from this soil, a thick and prodigious quantity of the common mustard plant shot up, and when in flower I happened to be collecting near the spot on the day of our gracious Queen’s coronation, when I captured multitudes of a splendid large _Allantus_, entirely new to the British fauna, and a choice addition to collections.