ART. 15 NOTES ON ACALYPTRATE FLIES MALLOCH 23 



ELASSOGASTER PLAGIATA Bezzi 



Elassogaster plagiata Bezzi, Philippine Jouru. ScL, sect. D, vol. 12, p. 135 

 (1917). 



This species does not belong to Elassogaster' on the basis of an 

 example in the Baker collection in the National Museum. It has 

 been removed to a subgenus of Plagiostenopterina. 



ELASSOGASTER HYALIPENNIS. new species 



Female. — Head fuscous, frons almost black, not shining, narrowly 

 testaceous on each side, face clay yellow, dark brown in foveae and 

 below them, parafacials and cheeks yellowish brown, labrum and 

 palpi testaceous yellow, occiput and frontal orbits rather densely pale 

 grey dusted, parafacials and cheeks not so much dusted; antennae 

 brownish yellow, third segment darker above. Thorax black, with a 

 distinct bronzy tinge, the mesonotum greyish dusted, slightly matted 

 in type but evidently without outstanding vittae, the mesonotal hairs 

 very short and dark, those on the pleura pale. Abdomen black, with 

 very pronounced bronzy or greenish luster, the hairs mainly yellow- 

 ish. Legs tawny yellow, fore coxae and fore tibiae slightly browned, 

 fore tarsi and apices of mid and hind pairs dark brown. Wings 

 hyaline, without distinct dark apical spot. Calyptrae and halteres 

 orange yellow. 



Frons about 1.5 as long as wide, sides slightly undulated, four ver- 

 ticals present, ocellars lacking; antennae slender, extending to lower 

 fourth of face in center, the third segment longer than height of 

 cheek, aristae distinctly pubescent at bases; labrum about twice as 

 high as width of third antennal segment; occipital bristle well de- 

 veloped. Thorax with the same bristles as in sepsoides Walker. 

 Fourth visible tergite about as long as the preceding two combined, 

 the surface almost without punctures. Legs normal, fore tarsus 

 hardly dilated, hind femur without anteroventral bristles but with 

 about three anterodorsal bristles apically. Wing venation differing 

 from that of the other species recorded above in having the third 

 vein very slightly bent down at apex ; inner cross vein almost erect ; 

 penultimate section of fourth vein about four-fifths as long as 

 ultimate one. 



Length, 8.5 mm. 



ry^e.— Female, Cat. No. 43065, U.S.N.M. Baguio, Benguet, P. I. 

 (C. F. Baker). 



This is the only species of the genus known to me in which there 

 is no apical or discal dark marks on the wings. 



