Commentary. According to Nicander, the hæmorrhus is about a foot in length, of a black or fiery colour, with two horns on its head, and eyes like those of locusts. The symptoms brought on by its bite, as described by Nicander, appear to have been very similar to those of the disease called purpura hæmorrhagica, namely, a discharge of blood from the gums, nose, ears, bladder, bowels, or any open sore. Ælian gives exactly the same account of it. (H. A. xv, 13.)
It appears from Dioscorides that the dipsas was also sometimes called prester and causon. (vi.) See also Ælian (H. A. vi, 51.) Lucian and Isidorus, however, make a distinction between the dipsas and prester. Lucian says that it resembles the viper de dipsadibus. In fact the dipsas seems to have belonged to the viper kind. (See Bochart, Hieroz. ii, 367.) Galen states that he was informed by the Marsi, who made a living in Rome by dealing in serpents, that the dipsades were not a peculiar species of serpents, but a variety of the viper found on the sea-shores of Africa. (De Simpl. x.) Isidorus thus defines them: “Hæmorrhois aspis nuncupatur, eo quod sanguinem sudet qui ab eo morsus fuerit: ita ut dissolutis venis, quicquid vitæ est per sanguinem evocat.” “Dipsas genus est aspidis quæ Latine situla quia quem memorderit siti perit.” (Orig. xii, 4.) The effects produced upon the system by the sting of the dipsas seem to have been of a highly inflammatory nature. According to Nicander, it kindles a flame in the heart, the lips become parched, and the person is seized with an unquenchable thirst. These symptoms are strongly portrayed by Lucan:
“Ecce subit virus tacitum, carpitque medullas
Ignis edax, calidâque accendit viscera tabe.
Ebibit humorem circum vitalia fusum
Pestis, et in sicco linguam torrere palato
Cæpit....
Ille vel in Tanaim missus, Rhodanumque, Padumque,
Arderet, Nilumque bibens per rura vagantem.
Accessit morti Libye, factique[1] minorem