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APPENDIX.
MONEDULA, Latr.
1. M. 4-fasciata.  Black, obscurely iridescent; tergum with four bands, interrupted and narrowed in the middle.
Inhabits Pennsylvania.
Jlntennze with the basal joint beneath yellow; orbits anteriorly, hypostoma and labrum, yellow; the latter margined each side with piceous, and the hypostoma has a more or less dilated black spot above; mandibles blackish-piceous; thorax with a capillary line before; wings hyaline, slightly fuliginous, nervures fuscous; metathorax at tip each side compressed and yellow; pleura with a whitish spot over the anterior feet, and from one to three yellowish approximate spots above the middle; feet pale yellowish; thighs black on the basal two-thirds, those of the anterior feet black only on the exterior side; tergum with four yellow bands, dilated on the sides, and gradually narrowing to the middle of the back, where they are slightly interrupted, the terminal one widely interrupted; two terminal segments with large punctures each side and at base; venter with three small yellow spots each side near the middle ; % with an obsolete spot each side on the two segments beyond the bands, and the anus is three-spined, of which the lateral ones are curved, and 2 with an obsolete, yellowish line before the wings on each side.
Length % three-fifths, ? nearly seven-tenths of an inch. This species is in the collection of Mr. William W. Wood. The hypostoma of the male specimen is occupied by the black basal spot, excepting on its anterior margin. The bands of the abdomen in this species are not at all dentated.
2. M. ventralis.   Black, obscurely iridescent; tergum