12 PEOCEEDINGS OF THE NATIONAL MUSEUM vou 69 



ginals; second with one pair discal and one median marginal; third 

 segment with one pair discal and a marginal row of about 10; fom*th 

 segment with a single discal pair as in the two preceding segments, 

 and a marginal row of about 12. Genitalia black, small, the inner 

 forceps distinctly separate, quite minute; the outer a little longer and 

 wider. 



Legs black, pul villi large; middle tibia with a single bristle on the 

 outer front side; hind tibia with an irregular row on outer hind side. 



Wings subhyaline, third vein with two or three hairs at base; 

 fourth vein near apex with oblique rounded curve, thence nearly 

 straight, ending somewhat before the tip of the wing. 



Female. — Front 0.24 of the head width at vertex, widening a little 

 more rapidl}" than in the male. The usual two pairs of orbital 

 bristles present. Pulvilli of ordinary size for a female. The piercer 

 is shining black, slender, curved and tapering, its tip just about 

 reaching the hind coxae. 



Length, 7 mm. 



Described from one male (type) and one female (allotype) collected 

 September 2 and 3, 1923, on the Shenandoah River, Clarke County. 

 Virginia, by the writer. 



Type— Cut. No. 28900, U.S.N.M. 



SYNORIS, new genus 



Distinguished frsom most Tachinid genera at a glance by the 

 presence of only one pair of anterior acrostichals, which are large 

 and placed considerably anterior to- the suture in a transverse line, 

 or nearly so, with the hindmost pair of anterior dorsocentrals. 

 Postscutellum well developed; head rather fiat, its length to the 

 antennae when measured by micrometer is exactly half the greatest 

 Avidth when viewed from in front ; the length at lower edge but little 

 less than at antennae. Eyes bare; frontal bristles extending to arista, 

 or thereabouts; parafacials and facial ridges bare; vibrissae at oral 

 margin; third antennal joint long and slender, second also somewhat 

 elongated, one-half the third; penultimate joint and arista short; 

 palpi normal; proboscis short and fleshy. 



Thoracic chaetotaxy of type species: iVcrostichal 1, 2 (none just 

 before or behind suture); dorsocentral 2, 3; humeral 2; posthumeral 

 1 ; presutural 1 ; notopleural 2 ; supraalar 2 ; intraalar 3 ; postalar 

 2; sternopleural 2, 1; pteropleural very small; scutellum with two 

 lateral, one long apical pair (with or without small pair between them) 

 and a good-sized discal pair. 



Abdomen with discal bristles. Venation of wings l)are, except 

 two or three hairs at T)ase of third ; first posterior cell narrowly open or 

 almost closed only a little before the apex of the wing; no costal spine. 



Type of genus. — Synoris coquiJletti, new species. 



