Head black, with a yellowish spot in the front, and another on the top. Eyes greyish, and shining like polished bell-metal. Antennæ pectinated or combed, and longer than the thorax. Ocelli three. Thorax black, with three small yellowish spots on the posterior part. Abdomen almost black at top, {106}and underneath of a greyish yellow (as are all the legs), having two short setæ or tails at the extremity. Wings membranaceous and transparent; the nerves appearing, when viewed by a magnifier, to be black and white, like the quills of a porcupine. Inferior wings shorter than the superior. Drury has figured the wings as of an uniform colourless appearance, which induces me to consider that it may be distinct from the Linnæan H. pectinicornis, that species being described by the great Swede with "_signaturis_ nervisque fuscis albo subarticulatis." From the paleness of the present species it is evident that the transverse nerves connecting the longitudinal ribs of the wings in the typical species of this genus have been overlooked, especially as the longitudinal nerves are correctly represented. This genus and Corydalis, seem to form a connecting link between Hemerobius and Perla. MYRMELEON AMERICANUM. Plate XLVI. fig. 4. ORDER: Neuroptera. SECTION: Filicornes. FAMILY: Myrmeleonidæ, _Leach_. GENUS. MYRMELEON, _Linn, &c._ MYRMELEON AMERICANUM. Thorace griseo nigro notato, alis hyalinis fusco et luteo punctatis, punctis nonnullis lineam centralem longitudinalem formantibus, abdomine fusco. (Expans. Alar. 5 unc.) SYN. Myrmeleon americanus, _Drury, App. vol._ 2. HABITAT: New York. Head black, front grey and hairy. Mouth with four long palpi. Eyes dark brown, almost black. Antennæ black, and as long as the thorax; being small at the base, and increasing in size to their extremities. Neck yellowish, striped with black, and covered with longish grey hairs. Thorax yellowish, with black stripes, and covered with long grey hairs. Abdomen, which is full an inch and a half long, brownish-coloured, and darker on the sides; being furnished at the extremity with two short hairy tails, seemingly of a horny substance. Wings of equal length, membranaceous and transparent, having a great number of small spots thereon of a dark brown colour; the superior ones being most spotted. Legs black, and covered with grey hairs; each of them being furnished at the tips of the tibiæ with two long spines that bend inwardly towards each other. ---- LIBELLULIDÆ, Pl. 47 & 48.