ART. 15 NOTES ON ACALYPTRATE FLIES MALLOCH 17 



of them from the Baker collection, and have one sent to me by 

 Dr. Kichard Frey from the same islands. 



PLAGIOSTENOPTERINA (STENOPTERELLA) TRIVITTIGERA, new species 



Female. — Similar to trivittata in general coloration, with the same 

 very distinctly trivittate thoracic dorsum, and a continuous fuscous 

 costal stripe. The two black thoracic vittae are, however, not 

 tapered posteriorly except just at their extremities and the yellow 

 central stripe is equally distinct on its entire length, the abdomen 

 has no dense yellow dusted anterior margins to the tergites, the dust 

 there being greyish and not at all dense, and the ground color is 

 deeper metallic blue-green. 



Structurally the species are very similar, both possessing the four 

 bristles on the anterior margin of the thoracic dorsum, but there are 

 numerous hairs on the scutellum besides the four bristles, while in 

 trivittata only the bristles are present. The third and fourth tergites 

 each have a pair of spiracular openings near the apex, one on each 

 side at the lateral curve, whereas trivittata has the same organs near 

 anterior margin, the pair on fourth tergite largest and separated by 

 about four times the width of an opening, those on third tergite 

 about half as large as those on fourth and separated by about twice 

 that distance. The mid femur in this sex has a few weak bristles 

 near the apex on the posterior surface in trivittata which are not 

 evident in the type specimen of the new species. 



Length, 8 mm. 



Type, Singapore, Straits Settlements (C. F. Baker). 



Type.— C2it. No. 41903, U.S.N.M. 



PLAGIOSTENOPTERINA (STENOPTERELLA) MARGINATA (van der Wulp) 

 Stenopterina marginata van deb Wulp, Tijd. v. Entoni., vol. 23, p. 179 (1880). 



This species differs from the preceding two in having the thoracic 

 dorsum colored much as in P. aenea Wiedemann, and the legs much 

 darker in color. 



Locality, Mount Salak, Java. 



It is possible that some of the other species placed by Hendel in 

 Plagiostenopterina belong to this subgenus, but it is impossible to 

 determine this without access to the species. There is one species very 

 similar to trwittata Walker that may also find a place in the sub- 

 genus, having the same conspicuously vittate thorax, but the costal 

 stripe is not continuous. This is vittigera de Meijere, described from 

 Sumatra. No mention is made in the description of the latter, nor 

 in that of any previously described species, of the presence of tergal 

 spiracles in the females so that their subgeneric location is not 

 possible from their descriptions alone. 



