66 Psyche [April 



black at base, third and fourth veins not appreciably convergent at tip. Abdomen 

 rather bright bluish green, glaucous underneath, hairs of the bright part black, of the 

 glaucous part white. Length, 3.8 mm.; of wing, 5.1 mm. 



Two females: Brookings, S. D. (type) and St. John's, Quebec, 

 Aug. 8, 1901, the latter collected by G. Beaulieu, his number 46. 



I hesitated a long time before describing this species. After 

 long consideration I satisfied myself that it is recognizably dis- 

 tinct, even in the female sex alone, so for the sake of completeness 

 I give it a name. Its relationships are with pirata perhaps more 

 than any other species, but the absence of procoxal spines and 

 the different color of the face, with other characters, are sufficient 

 to distinguish it. 



Hydrophorus innotatus Loew. 



Male. Occiput green, with brown dust, not bright, only two postverticals; front 

 opaque brown; face bright green above with onlj' a little brown pollen, changing to 

 white above the suture and densely covering the lower half; palpi brown; cheeks 

 forming narrow flaps; the black postorbital hairs about 18 in number, descending 

 two-thirds of the way to lower edge of the eye; beard yellow, dense, mixed under 

 the neck with a few black spines; antennae short and small, first joint hardly larger 

 than second. Dorsum of thorax and abdomen rather uniform sealbrown; scutellars 

 two pairs, acrostichals in a rather dense row, dorsocentrals slender in front, the post- 

 humeral strong; pleurse glaucous except irregularly along the upper part, where 

 they are brown like the dorsum; propleura with yellowish hairs and one large black 

 bristle; halteres with brownish knob; wings hyaline, veins black. Front coxae 

 glaucous, with very small white hairs and a conspicuous row of black bristles, 

 about seven in number, longest at the base, placed rather on the outer side of the 

 member; these bristles do not quite reach to the apex, but after an interruption 

 there are more placed somewhat transversely across the tip; front femur below with 

 a row of short but stout spines on the inner side, smallerand irregularly placed near 

 the base, and on the outer side a row consisting of three or four rather large spines at 

 base and beyond them as many more notably large, long ones, standing far apart, the 

 last a little beyond the middle; front tibiae with a very regular row of small inclined 

 spines, not larger at tip, where the tibia curves slightly toward the femur; the 

 other legs of plain structure. Abdomen short, brown down on the sides almost as 

 far as the suture, glaucous imderneath; hypopygium small, fourth sternite project- 

 ing V-shaped, this and the lobes of flaps behind bordered with whitish hairs; sides 

 of abdomen with yellowish hairs near base. 



Length, 3.7 mm.; of wing, 5.2 mm.; the latter indicates that the specimen is 

 abnormally shortened in drying, or else has naturally a very short abdomen. 



The female has a wider face, and the dust is wholly brown on the lower part, 

 except just below the suture on each side, where it shows a tendency to a white 

 spot as in signiferus. This is largely a matter of the direction of the light. Halteres 

 distinctly brown on the knob, rather more so than some males. Length, 4.1 mm.; 

 of wing, 5.2 mm. 



