90 PROCEEDINGS ENTOMOLOGICAL SOCIETY 



ous; vibrissa well differentiated; face in profile slightly retreating, mouth 

 margin not produced; mesonotum with two pairs of strong dorso-centrals, 

 the anterior pair placed far forward, generally about three-fourths of the 

 distance to the suture; sometimes there is a setula anterior to this bristle 

 but it cannot be considered as a dorso-central; the pair of bristles between 

 the posterior dorso-centrals is distinct but rather weak; discal hairs weak, 

 but numerous, about ten to twelve rows between the dorso-centrals. Abdo- 

 men ovate, tapering towards apex; surface hairs numerous but not bristle- 

 like; hypopygium small; legs rather stout; mid-tibia with the posterior 

 bristles well developed and rather closely placed, the upper one distinctly 

 the longest. Wings as figure. Length 2 to 2.5 mm. 



Female: Similar to the male in all particulars except the ovipositor 

 which is rather short and of the normal form, not projecting further than 

 the length of last abdominal segment. 



Type-locality: Rio Piedras, Porto Rico, December 2, 1913 

 (T. H. Jones), Porto Rico Sugar Growers' Association, Accession 

 No. 983, 1913. Three males and one female. Reared from Vigna 

 repens (?). 



Type: Male, deposited in U. S. National Museum, Washing- 

 ton, D. C. This species will run down to viridula Coq. in the 

 synoptic table of this genus in my recent paper in the Annals 

 of the Entomological Society of America, but the very marked 

 difference in the size of the orbital bristles should readily separate 

 it from that species, and also from dubitata Malloch, which it also 

 resembles very closely. In general appearance this species re- 

 sembles closely the species belonging to the virens group, but the 

 pale halteres may be readily used as a means for separation. 



FOUR NEW SPECIES OF TACHINID^ FROM NORTH AMERICA. 



BY W. R. WALTON, Bureau of Entomology. 



PoLYCHiETONEURA new genus. 



Body with true macrochsetse, palpi normal, proboscis short fleshy, fir^t, 

 third and fifth veins all bearing closely set black setulae for at least two- 

 thirds their lengths. Ocellar bristles present normal, facial ridges bristly 

 on lowest fifth only. Arista pubescent, second joint slightly longer than 

 broad. Apical cell entering costa at extreme tip of wing, fourth vein 

 rounded in a circle of large radius, posterior cross vein straight, approxi- 

 mating 90 degrees of angle, entering fourth vein midway to bend. Costal 

 spine small. Head much shorter at vibrissse than at base of antennae. 

 Face on lower half of sides, bare. Third antennal joint broad, rounded at 

 apex. Eyes of female bare. Abdomen ovate, legs short. 



