.iKT. 22 LITTLE KISrOWN DIPTEEA ALDRICH 17 



Genus LIXOPHAGA Townsend 



Lixophaga Townsend, Taxonomy Muscoid Flies, 1908, p. 86; Journ. N. Y. Ent. 

 Soc, vol. 21, 1913, p. 303. — Aldrich, Insecutor Menst., vol. 12, 1924, p. 146; 

 Proc. Ent. Soc. Wash., vol. 27, 1925, p. 133. 



LIXOPHAGA ORBITALIS, new species 



Male.— Front 0.345 of head width (average of two, 0.34 and 0.35), 

 its pollen with a slight yellowish tinge on the upper half; two orbitals 

 on each side; frontals seven, the upper two reclinate, the second 

 largest, lowest at level of tip of second antennal joint; parafacial 

 silvery, tliree-fourths as wide as tliird antennal joint, bare; face re- 

 ceding, the ridges with only a few fine hairs above vibrissae; antennae 

 black, third joint five to six times as long as second, rather wide; 

 arista with short basal joints; palpi yellow, bucca about one-fourth 

 the eye height. 



Thorax cinerous, showing when viewed from behind fom- black 

 stripes to the suture and five behind it, the median one not extending 

 before the suture. Chaetotaxy: Dorsocentral 3, 3; acrostichal 3, 3; 

 humeral 3; posthuraeral 2; presutural 2 (inner small); notopleural 2; 

 supraalar 3; intraalar 3; postalar 2 ; sternoplem'al 2, 1 ; scutellum with 

 3 lateral, 1 discal, 1 small upturned decussate apical. 



Abdomen with black ground color, tinged with reddish at sides ; 

 first segment black, the three following with dense pale yellowish 

 pollen on basal three-fourths, the remainder black. The black on 

 the second segment is more or less expanded forward on each side, 

 and there is a narrow median dark stripe which shows on the second 

 and third segments. First and second segments with one pair median 

 marginals; tliird with a stout marginal row of 8; fourth with smaller 

 marginal row of 8 or 1 ; no discals on any segment. Genital segments 

 black or brown, very inconspicuous, the genitalia hke those of 

 variabilis in having the inner and outer forceps slender, long, nearly 

 parallel; the inner are a trifle the shorter and sharp at tin: the outer 

 rounded. 



Legs black; mid tibia with one on outer front, one flexor, two be- 

 hind. Hind tibia with irregular row on outer hind side. Pulvilli 

 very small. 



Wings hyaUne; first posterior cell open, ending just before ex- 

 treme tip of wing; third vein with 2-3 hairs at base. 



Female. — Front 0.355 of head width at vertex (average of two, 

 0.36 and 0.35) widening anteriorly; antenna slightly shorter than in 

 male. Without piercer. One of the two has four posterior dorso- 

 centrals, but not evenly spaced. 



Length, 4.2 to 5.6 mm. 



