64 Psyche [April 



Hydrophorus parvus Loew. (fig. 3.) 



Male. Minute browii species with wholly dark brown halteres. Occiput brown, 

 one pair of postverticals, postorbitals twelve, extending about halfway down the 

 eye; opposite the ocellar tubercle on the orbit an unusually long proclinate and con- 

 vergent pair of bristles; beard white and rather thin, cheek narrow; no black bris- 

 tles under the neck; front brown; face narrow above, yellow to brown, entirely 

 opaque, palpi blackish; antennae of medium size, not elongated, still the third joint 

 protuberant at tip in the middle. Thorax sealbrown above the notopleural suture 

 and glaucous below; two pairs of scutellars, one humeral and one or two hairs; one 

 posthumeral, two notopleural, both large; seven large dorsocentrals in each row; 

 acrostichals small; all these thoracic bristles are comparatively large; propleura 

 with only a few small white hairs and one black bristle; mesopleura with only a 

 few microscopic white hairs, the pleura otherwise bare; halteres wholly dark brown; 

 squama brown, with yellowish hairs. Front coxa white pruinose, with very few 

 white hairs, but a row of black bristles down the front side, largest at proximal end, 

 tapering off into a few white hairs near tip; there are also a few black spines across 

 the tip. All the legs below the coxse dark green, he tarsi blackish; front femora 

 below with about three stout spines near base, on the inner side with a row of small 

 spines most of the length; front tibia on the inner side with a row of inclined spines, 

 longer distally, but not ending in a prominent spine; middle and hind femora 

 slender, a Uttle bowed. Wing narrow, subhyaline, veins black, first posterior cell 

 not narrowed, last section of fourth vein straight; last section of fifth vein as long 

 as the posterior crossvein. Length, 2.6 mm.; of wing, 3.5 mm. 



Female. Face brown, narrow; resembling the male very much in all respects. 

 Length, 2.8 mm.; of wing, 3.6 mm. 



Tliree males and two females: New Bedford, Mass. (Hough); 

 Hampton, N. H., April 17 and 22 and May 5, 1904 (from C. W. 

 Johnson, collected by S. A. Shaw); Somerset, Mass., Dec. 31, 

 1904 (from C. W. Johnson, col. by N. S. Easton). The type 

 locality was Illinois. 



Hydrophorus pirata Loew. 



Male. Occipiit brownish pruinose, with one pair of postverticals; postorbitals 

 about sixteen on a side, descending nearly to the lower edge of the eye; beard rather 

 light yellow; cheek rather narrow; front and face opaque brown, palpi dark brown 

 with black hairs; antennae of ordinary structure, but the first joint a little elon- 

 gated. Dorsum of thorax and abdomen sealbrown, this color extending a little 

 below the notopleural suture and correspondingly on the abdomen, the side of the 

 body below being densely white pruinose with a slight glaucous tinge; scutellar 

 bristles two pairs, humeral two, notopleural two, the dorsocentrals much smaller, 

 yet not so small as in some species, about 11 in number, the next to the last largest; 

 propleura with a few delicate yellowish hairs above, some coarser ones below that 

 seem almost brown in certain hghts, and one large black bristle; pleurae with no 

 other hairs except a few microscopic whitish ones on mesopleura; squama brown 

 with yellow hairs; halteres with brownish stem and very dark, almost black, knob. 



