Attention is called to some characters used by the writer. The dorso-central bristles are numbered from the anterior edge of the mesonotum designating the bristle in front of the transverse suture as the first dorso-central. Hering (1927) numbers them in the reverse direction calling the bristle in front of the transverse suture the fourth dorso-central. Previous papers on the chaetotaxy of Diptera have not numbered the dorso-central bristles. The number and arrangement of the setae along the lower and hind margin of the cheeks also lend good characters. The writer speaks of the cheeks collectively as the portion between the eyes and the mouth including the gena or wangen arrd the bucca. The term occiput has been used to designate the whole of the back of the head. The color of the occiput has been found valuable especially when the yellow of the cheeks continues back of the eye. In some cases the yellow of the cheeks is interrupted near the vertex by the black of the occiput.

The recent acquisition, through the kindness of Rev. L. M. Stöhr, of exuviae of Gomphus amnicola Walsh, accompanied by adults found emerging, led the writer to examine such specimens of allied forms in the Royal Ontario Museum of Zoology as were available for comparison. As these proved inadequate for the purpose, I appealed to Professor C. H. Kennedy and Mr. E. B. Williamson and, through their kind and prompt response, I obtained sufficient material for the study of those species most nearly related to G. amnicola, viz., the members of the Stylurus group.

The two species described below live in the burrows of the common prairie dog.

Saprinus cynomysi n. sp.

Length (apex of thorax to apex of suture) 6-6.2 mm.; width 5 mm. Black, strongly shining throughout.

Head moderately finely and sparsely punctate, the punctures becoming very fine and sparse at middle of occiput. Supraocular stria distinct, extending across the front.

Neottiglossa tumidifrons n. sp.

Head, with the portion before the vertex concave and bent dorvnwards, closely punctate above and on the sides, the punctations becoming coarse and uneven near the middle of the concavity. Lorver lateral margins of the head carinated, above which the juga are roundly thickened, the thickening extending without interruption to the extremities of the juga, which are contiguous beyond the tip of the tylus.

The following notes are based upon a collection made by Dr. Vasco M. Tanner and associates during the early part of the summer of 1927 in the La Sal Mountains of San Juan County, Utah.

Our knowledge of the crane-flies of Labrador is still very insufficient. The most extensive collections that have yet been made are those of Mr. W. W. Perrett, taken in the years 1922 to 1925, inclusive, at and near Hopedale. This important series is the property of the Canadian National Collection and was kindly loaned to me for examination by Mr. Curran, to whom I would express my sincere gratitude.