Length 4–4½ mm. Dull black, sparsely clothed with very short, light-colored hair; eyes widely separated in both sexes, naked; antennae entirely in front of the eyes; front produced more in the female than in the male, posterior orbits present in both sexes, widest in the female; thorax nearly equally four-sided, scutellum without spines, wings hyaline, veins bounding costal, basal, marginal, and first and second sub-marginal cells heavy and dark colored; discal cell rather small emitting four posterior veins; legs black, knees and tarsi lighter colored than the other parts; abdomen short and wide. Five males and four females taken at Hawkins, near Akron, Ohio, May 21, 1899. This is so distinct from species of _Nemotelus_ in general appearance, and structure of the head, especially in the male, that it seems best to make it the type of a new genus. CHRYSOCHROMA NIGRICORNIS Loew. This is a common species in southern Ohio. Specimens may be found resting on the upper side of leaves and are easily approached. In the female the white fronted line which Loew mentions is very conspicuous and extends from one eye to the other above the antennae. In some specimens the white lateral, thoracic lines are very easily seen, but in others these lines are brownish. The male has much the appearance of the female, the eyes are broadly contiguous, leaving a small vertical triangle which is largely occupied by the ocelli; the lateral thoracic lines in this sex are dark brown and therefore are not such a contrast to the bright green thorax as in the female. I had some trouble in locating the genus of this species by Dr. Williston’s key. The species is not elongate, but of much the same form as _Microcrysa polita_. A comparison was made with the type. OHIO BATRACHIA IN THE ZOOLOGICAL MUSEUM OF THE O. S. U. MAX MORSE. Fam. PROTEIDÆ. _Necturus maculatus_ Rafin. University Lake, Olentangy River, and Lake Erie. Near Sandusky, on both the Lake and Bay shore, decaying specimens of the mud-puppy, mostly young, were found in numbers in 1900. Almost all were covered with a fungus—probably _Saprolegnia_. Fam. CRYPTOBRANCHIDÆ. _Cryptobranchus alleganiensis_ (Daudin.) Columbus. Fam. AMBLYSTOMATIDÆ. _Amblystoma opacum_ (Gravenh). Portsmouth and Sugar Grove. _Amblystoma tigrinum_ (Green). Columbus. This salamander appears early in the Spring and is often found in small pools. Individuals are taken nearly every Autumn in the basement of the Biological Hall while they are seeking shelter. A specimen taken thus had many characteristics in common with _xiphias_ Cope and it is doubtful how valid _xiphias_ is, as a species. _Amblystoma microstomum_ (Cope). Columbus and New London. Fam. PLETHODONTIDÆ. _Plethodon cinereus cinereus_ (Green). Sugar Grove.