be, and probably are, received by, and interpreted through, the medium of these hairs. For though the Scorpion may not respond to sounds made by curious investigators, it may be that they can perceive notes of a low pitch imperceptible to our ears, such as are made by stridulating organs, as in the case of the Spiders. Perchance certain comb-like structures known as the “pectines” may play a part in mate-hunting. These are placed on either side of the under-surface of the body between the last two pairs of legs. The fact that they are larger in the male, and sometimes strangely modified in the female, seems to show that they have some function in relation to sex. They also appear to serve as sources of information as to the nature of the ground traversed by the animal, since they are long in species which walk with the body raised high off the ground and short in such as adopt a more grovelling posture. That the Scorpions possess but a very limited means of gleaning information of the outer world there can be no doubt. How, then, do they find one another when that insistent desire to mate begins to make itself felt? Are the “pectines” their informants through the sense of smell? Do the hairs scattered over the body act as sound-collectors responding to the notes emitted by the stridulating organs? These are points on which information is much to be desired. [Illustration: Plate 36. Photo by P. H. Fabre. DEATH OF THE MALE SCORPION. But by the time the nuptial rites have been performed the female has thrown off her “sweetness,” and ends by eating her lover! Face page 254.] [Illustration: Plate 37. Photo by Paul H. Fabre. THE FEMALE MANTIS DEVOURING HER MATE. With these insects, as with the spiders and scorpions, the male is often eaten by the female.]