1911] Aldrich — North American Species of Hydrophorus 67 



Twelve specimens, both sexes: Beaver Creek, Newport, Oregon, 

 Aug. 13, 1902; Keyport, Wash., Aug. 7, 1905; near Seattle, 

 no date; Bellingham, Wash., July 29; Lyndon, Wash,. July 29, 

 1908, The last two lots mentioned are from Professor Melander, 

 and the preceding one from Prof. O. B. Johnson. The type 

 locaHty of the species was Sitka. Loew's description is easily 

 recognizable and there can be no doubt of the identification. 



Hydrophorus altivagus sp. nov. 



Male. Occiput bright metallic green with faint brownish pruinosity ; postverticai 

 bristles one pair; postorbitals about fourteen on a side, extending a little over half- 

 way down the eye; beard yellow, no black bristles below the neck; cheeks \\ade; 

 front brownish poUinose, not much shining; face bright green on the upper fourth, 

 the rest white poUinose; palpi strongly contrasting dark brown, with black hair; 

 antennae short, of ordinary form. Dorsum of thorax rather dark bronze-green, 

 moderately shining; upper part of pleura concolorous with the dorsum for a 

 narrow space; scutellar bristles two pairs, humeral two, notopleural two; dorsocen- 

 trals comparatively large for the genus, the penultimate one almost as large as the 

 scutellars; propleura with long, delicate yellow hairs and one strong black bristle; 

 mesopleura with a few microscopic pale hairs; squama yellow with yellow hair; hal- 

 teres almost black, the stem yellow in the middle. The pruinosity of the pleura is 

 almost white. Front coxa with abundant yellowish hairs on the anterior side; five 

 or six black spines at tip and a row of black spines, four in the described specimen, 

 running up the outer front edge from the tip about halfway to the base; front femur 

 moderately thickened, on the inner side below with seven stubby spines forming 

 an irregular row the entire length, on the outer side below there appear to be only 

 two or three short spines at base; front tibia straight, with the usual row of small 

 spines on the inner side; they are not erect, and are very uniform; middle and 

 hind femora shining blue-green, not very slender. Wings large and rather broad, 

 subhyaline, veins black, unspotted. Abdomen rather bright bronze-green above 

 and on the sides almost to the suture, the rest whitish pruinose; hypopygium more 

 concealed than usual. Length, 4.7 mm.; of wing, 5.1 mm. 



Female. Face with yellowish-brown dust below, on each side below the suture 

 changing to gray; palpi as in the male, blackish; front cox« with one spine above 

 the tip or none (this is evidently a variable character); spines on under side of 

 front femur as in the male but somewhat longer. Length, 4.8 mm.; of wing, 5.6 



mm. 



One male, Marshall Pass, Colo., Alt. 10,856 ft., July 29, 

 1908; three females, Boulder, Colo., August, 1897. 



Hydrophorus amplectens sp. nov. (figs. 8, 13). 

 Male. Postorbital black bristles about twenty-six in number, extending almost 

 down to the lower corner of the eye, postverticals only two, beard pale yellow, 

 cheeks exceedingly narrow; occiput green, front sealbrown, face rather narrow. 



