Art. 23 GENUS CYLINDROMYIA MEIGEN ALDEICH 11 



CYLINDROMYIA NIGRA, new species 



(Figs. 10. 32) 



Ocyptera argentea Townsend, Coquillett, Revision Tachin., 1897, p. 86 (misideri- 

 tification). — Johnson, Cat. Ins.. New Jer.sey, 1899 and 1909. — Banks, Ent. 

 News, vol. 23, 1912, p. 110.— Brimley, Ent. News, vol. 33, 1922, p. 24 

 (argentata, a slip of the pen). 



A small species easily distinguished by the characters in the key. 

 The vertex is shining, and the parafacials and parafrontals have 

 smooth pale yellow pollen: the parafacials are rather narrow, and 

 the frontal stripe is narrower than one parafrontal in its middle. 

 Antennae black, but the tip of second joint and base of third red- 

 dish; third joint one and one-half times the second. In profile the 

 eye is nearer the front than back of the head. Bucca about one- 

 eighth of the eye. 



Thorax black, the silvery pollen of the sides extending upon the 

 dorsum to include the presutural bristle. 



Abdomen wholly black, the white pruinose bands arcuate, so as 

 to include a little of the back edge of the first and second segments 

 at the middle, and also extending upon the venter. First principal 

 segment Avith only two bristles on the lateral margin ; fourth segment 

 without bristles except one on each side. 



Wings brown, fourth vein generally not with stump at bend, the 

 apical cell wide distally; hind crossvein straight, almost erect. 



Male. — Second principal abdominal segment with a cluster of four 

 spines at the median line below, on the inflexed tergite before its 

 posterior edge. Posterior forceps united to tip, of soft texture, 

 basally brownish, apically whitish and swollen, as long as anterior 

 ones, which are shining brown and end in a sharp point on the 

 anterior edge. 



Fem<ile. — Abdomen uniformly keeled below to middle of third 

 segment, the second without distinct ventral depressed bristles. Last 

 genital segment with very distinct terminal hooks rather close to- 

 gether, their tips turned a little toward the segment. 



Length, 5,5 to 6 mm. 



Described from 32 specimens of both sexes. In the United States 

 National Museum are 16 specimens collected in the District of 

 Columbia and adjacent Maryland and Virginia, by Knab, Barber, 

 McAtee, and Shannon. Two specimens from Chesapeake Beach, 

 Maryland (Aldrich), include the allotype female. Others are from 

 Baltimore, Maryland (Barber) ; Mechanicsburg, Pennsylvania 

 (Walton); Delaware County, Pennsylvania (Johnson); Westville, 

 New Jersey (Johnson) ; Wenonah and Trenton, New Jersey (Har- 

 beck) ; New Haven, Connecticut (H. B. Kirk). 



In C. W. Johnson's collection are specimens from AValtham, Mas- 

 sachusetts, and Orange Mountain, Ncav Jersey, both collected by 

 Johnson. 



