4. B. centrátus. Black; tarsi and tip of the tibiæ

obscure piceous.

Inhabits Indiana.

Body black, polished, with scattered hairs: antenna with an obsolete piceous tint, excepting the basal joint: metathorax with discoidal punctures and lineations: wings hyaline; two brachial cellules; a simple, short, oblique rectilinear inflection of the tip of the radial nervure pointing towards the centre of the wing: nervures pale: tergum polished: tibiæ and tarsi obscure piceous; the latter blackish at tip.

Length less than three twentieths of an inch.

This species is considerably larger than the preceding and differs in the color of the antennæ and of the feet.

COPTERA, Nob.

ARTIFICIAL CHARACTER.

Wings without nervures; superior wings folded and with a fissure at tip; abdomen of two segments.

NATURAL CHARACTER.

Body moderately slender: head longitudinally oblong, truncate or a little excavated before, over the insertion of the antennæ eyes lateral, rounded, entire: stemmata three antennæ submoniliform, gradully enlarging a little towards the tip; basal joint longest and dilated: wings without obvious nervures; superior wings large, folded longitudinally in two, and at the tip of the fold with a profound fissure; inferior wings rather slender: abdomen composed of but two segments, of which the basal one is somewhat petioliform: feet moderate.

OBSERVATIONS.

This new genus differs from all others with which I am acquainted, that have nerveless wings, by having the superior wings doubled, by an equal fold, and at their tips a deep and obvious fissure. I have, as yet, seen only the male.

SPECIES.

C. polita. Black; feet honey-yellow.
Inhabits Indiana.

Body polished, black head anteriorly rugose and biangulated: antennæ at base, excepting the first joint, piceous thorax with two impressed lines: wings with short hairs and ciliate: abdomen oblong-oval, basal segment with elevated lines.

Length about one twelfth of an inch.
Taken on the window July 20.

PSILUS, Jur.

1. P. terminatus. Black; feet and base of the antennæ honey-yellow.

Inhabits Indiana.

Body black, polished, with a few, rather long, scattered hairs: antenna thirteen-jointed, elongated, geniculate between the second and third joints, honey-yellow; first joint in a frontal groove; second joint elongated, subfusiform, third joint cyathiform; remaining joints moniliform, equal to the eleventh joint, which is abruptly dilated and with the twelfth equal, subquadrate, black; thirteenth joint subequal to the preceding, globose-ovate, black wings with short ciliæ, and with short hairs;

nervures none; stigma triangular, black: abdomen dull honey-yellow at base; first segment half as long as the thorax feet honey-yellow.

Length over one twentieth of an inch.

Although the wings entitle this species to a place in Jurine's PSILUS, yet the antennæ are entirely different from those of the type P. élegans, resembling considerably those of his P. antennàtus.

2. P. abdominalis. Antennæ clavate, as long as the body; black, abdomen whitish.

Inhabits Indiana.

Body black antennæ broken at the second joint; first joint one fourth the whole length, whitish; second joint obconic; terminal joint ovate-fusiform, longer than the three preceding joints together: wings very deeply ciliated abdomen whitish, particularly at base: tarsi whitish.

Length about one fortieth of an inch.

3. P. apicàlis. Antennæ at the tip of the head, which is a little prominent.

Inhabits Indiana.

Body black, polished: antennæ as long as the body, fuscous, with subquadrately moniliform joints; basal long joint honey-yellow; terminal joint not much longer than the preceding one; inserted at the tip of the head; beneath the antennæ is a rather broad prominence; costal nervure but little less than half the length of the wing, triangular and black at its tip: feet honey-yellow: petiole distinct.

Length one twenty-fifth of an inch.

It is probable that the present insect is related to the P. cornutus of Panzer, but I have not the means of comparing.

4. P. colon.

middle.

Inhabits Indiana.

Wings with a dusky dot before the

Body black, polished: antennæ nearly as long as the body; terminal joint as long as the first and equal to the four preceding joints together: wings hyaline; an oval, dusky spot a little beyond the tip of the costal nervure and extending nearly across the wing; costal nervure with its terminal half more dilated than the basal portion and blackish: tarsi and anterior pair of tibiæ honeyyellow.

Length one twenty-fifth of an inch.

Readily distinguished by the dusky wing-spot.

ANTEON, Jur.

A. tibialis. Black; tibiæ and tarsi dull yellowish.
Inhabits Indiana.

Body polished, black: metathorax punctured and with longitudinal slightly elevated lines: tergum towards the tip with a few, rather long black hairs: tibiæ and tarsi dull yellowish-white.

Length about one tenth of an inch.

1. H. obsolètum.

HEDYCHRUM, Latr.

g Thorax on the disk very slightly punctured; abdomen entire at tip.

Inhabits Indiana.

Body green, varied with purplish: thorax on the disk tinged with purple, and with sparse, slightly impressed punctures: wings fuliginous: metathorax and pleura with discoidal punctures, and a confluent blackish, double, in

dented spot behind: tergum with a purple reflection, less obvious on the posterior segment; punctures slightly impressed, more obvious each side and on the terminal segment; terminal segment about equal to the preceding, perfectly entire at tip: venter bronze: tarsi brown.

Length less than one fourth of an inch.

Differs from ventrale, Nob., which has the terminal segment slightly longer than the preceding one and very obtusely and slightly emarginate at tip, and the thoracic punctures are not sparse on the disk; the sinuosum, Nob. has a deep and acute emargination at tip of the terminal segment of the tergum.

2. H. spéculum. Green; tergum and disk of the thorax impunctured.

Inhabits Indiana.

Body green, varied with purplish: antennæ, excepting the first and second joints, blackish: head with discoidal punctures, vertex and posterior margin impunctured: thorax impunctured, polished, with an impressed, abbreviated line each side of the middle: metathorax with discoidal punctures: wings fuliginous: tergum impunctured, polished; terminal segment hardly half as long as the preceding one, obsoletely punctured each side, at tip obtusely emarginate: tarsi pale honey-yellow: venter brassy.

Length less than three twentieths of an inch.

The smallest species I have yet met with in this country.

PYRIA, Lepel. & Serv.

P. tridens, L. & P. Encyc. Meth. CHRYSIS carinata, Nob. Contrib. Macl. Lyc. p. 82.