1911] Aldrich — North American Species of Hydrophorus 63 



Female. Very like the male and about the same size in some specimens; some 

 unshriveled ones a little longer. 



Seven males and fifteen females: Crawford's, Franconia and 

 Mt. Washington, N. H. (IVIrs. Slosson); New Bedford, Mass., 

 April 20, 1896 (Hough); Provincetown and Eastham, Mass., 

 (C. W. Johnson) ; Montreal, Quebec, Sept. 8, 1901 (G. Beaulieu) ; 

 Battle Creek, Mich. ; Boulder, Colo. 



I at first identified this with glaber Walker, but according to 

 the description that species has yellow halteres. The references 

 in my catalogue under glaber, mentioning its occurrence in Alaska 

 and New Hampshire, are probably this species. 



Hydrophorus phoca sp. nov. (fig. 2). 



Male. A small species with brown dorsum and spotted wings. Occiput greenish 

 with only the usual postvertical bristles; front and vertex sealbrown, not shining; 

 face of moderate width, with brown pollen, which is so thin on the upper half that 

 the green ground color shows through very plainly; this part of the face has deep 

 longitudinal corrugations; palpi dark brown; antennae wholly black, the first joint 

 short, hardly longer than the second; third joint also small; infra-orbital bristles 

 extending down almost to the lower border of the eye, beard yellow, no black 

 bristles below the neck. Thoracic dorsum brown above with two faint rows of 

 lighter spots that intervene between the bristles of the dorsocentral rows; the 

 posterior part of the thorax is damaged by the pin in the described specimen; 

 scutellum rather bright green, with four large bristles; the bristles of the sides of 

 the thoracic disk are much larger than those of the central part; two small humeral 

 bristles; no hairs behind the humerus; propleura with yellow hairs only on its 

 lower part, and above them a rather strong yellowish-brown bristle; no perceptible 

 hypopleural hairs; both halteres missing in the described specimen. Front coxae 

 with yellow hairs, long above, and only two or three small black spines at tip; 

 front femur thick at base, below with yellow hairs near base and in the same region 

 a short row of only four or five black spines; the front tibia not much curved, al- 

 most straight, seemingly with only minute setulse on the inner side, but in the 

 specimen it is impossible to see the structures here very well; middle and hind 

 femora long and slender. Wings slightly brownish, with a distinct brown spot 

 on the hind crossvein and another on the fourth vein a little beyond, both dis- 

 tinctly visible to the naked eye; all the veins black to the base. Abdomen small 

 and short, greenish above, pruinose on the sides and below, bearing pale hairs below 

 and longer ones on the sides of the first segment above; the fourth sternite has 

 a ridge in the middle, which is split from behind forward. 



Length, 3.1 mm.; of wing, 4.4. 



One male, collected by the late Rev. Mr. Livingston, at Corfield, 

 Vancouver Island, B. C, dated 8-7-96; from Professsr Melander. 



