THE CANADIAN ENTOMOLOGIST. 35 



N'osiima, n. gen. Hydrellinse. — Second joint of antennae destitute 

 of bristles, arista with long pectinations on the upper side ; two pairs of 

 vertical bristles, a strong pair of ocellars, situated between the two upper 

 ocelli, three pairs of extremely small fronto-orbitals forming a row along 

 each eye ; face strongly projecting forwrvrd below, in profile slightly con- 

 cave to the lowest seventh, then strongly retreating to the oral margin, 

 three bristles near each lower corner of the face; eyes densely pubescent. 

 Thorax bearing two pairs of dorso-centrals, no bristly hairs between 

 them, only a few on any portion of the thorax ; two notopleural and a 

 small sternopleural macrocha^tje, two pairs on the scutellum. Abdomen 

 composed of five segments, of which the second is as long as the three 

 following taken together, the latter subequai in length. Legs destitute of 

 long bristles. Venation normal, the costa is continued to the tip of the 

 fourth vein, apex of second vein slightly nearer tip of the third than to 

 the first, last two sections of fourth vein subequai in length. Type, the 

 following species : 



Nostima Slossofice.^ n. sp. 9 . — Black, opaque, the legs polished, 

 the under side of the third antennal joint, the tarsi except the last joint, 

 and a band near the middle of each hind tibia, yellow ; face gray 

 pruinose, a small brown spot near the centre, front blackish brown, an 

 ocellar dot, the upper corners and narrow orbits, gray ; mesonotum gray 

 pruinose, marked with five dark brown vittfe, pleura black, a gray streak 

 near the middle of the front part, and another on the upper edge of the 

 sternopleura ; scutellum black, the front corners gray, metanotum and 

 abdomen black, a pair of gray spots on the third, fourth and fifth seg- 

 ments ; wings dark brown, the costal cell and the marginal cell adjoining 

 it almost wholly white, a white spot covering a stump of a vein nearly 

 midway between apices of first and second veins, a similar spot before, 

 and another at the apex of the second vein, one near the apex of the sub- 

 marginal cell, another in the first posterior cell slightly more remote from 

 its apex than the above, one on the fourth vein opposite the one in the 

 first posterior cell, one near the apex of the discal cell, and one on the 

 opposite side of the fifth vein ; a white spot on the small cross vein, one 

 at each end of the hind cross vein, a nearly triangular spot in extreme 

 apex of the first posterior cell, and a large one at the first third of this 

 cell, a narrow one on the opposite side of the third vein, a whitish streak 

 near base of discal cell, and another near centre of the third posterior 

 cell ; length nearly i mm. Biscayne Bay, Florida. A single specimen 

 collected by Mrs. Annie T. Slosson, to whom this handsome species is 

 respectfully dedicated. Type No. 4297, U. S. Nat. Museum, 



