E. T. CRESSON, JR. 59 



This form seems to bo subject to considerable variation, 

 ■especially in the color of the legs. The tibiae and femora 

 range from entirely black to almost wholly yellow. The latter 

 seem to simulate a variety I have seen from South America. 



One hundred and sixty-eight specimens, which I have credited 

 to this form, were found in tlic material from the following 

 localities: Alajuela, September 15 to February 19; Quel)rada de 

 Salas, Altenas Station, May 8; Cartago, October 10 to February 

 19; Juan Vinas, May 28; Turrucares, December 19 to 22. 

 Discocerina aenea new species 



This species is placed here provisional!}'. Some authors maj^ 

 consider it belonging nearer Athyroglossa glaphyropus Lw. It 

 probably represents a distinct genus. In general structure it 

 resembles Discocerina, especiall}- those species near nifida, but the 

 spinose fore femora suggests species placed in Athyroglossa and 

 Ochtheroidea. 



Black; middle and hind tarsi yellow; fore tarsi black; wings hyaline with 

 pale veins. Shining; mesonotum subopaque, minuteh' granulose and thinly 

 brown dusted. Small spots laterad of, and below, antennae, and two or three 

 on each facalia silvery. Meso- and stcrno-i)leura and abdomen liighly polished 

 and metallic tinged. 



Face broad, evenly convex on lower i)art of profile, which convexity is not 

 sharply defined from the foveae. Cheeks linear. Mesonotal setulae numerous, 

 in very close series medianly; no pre-scutellar bristles. Femoral spines minute, 

 in series of about twelve. Length. — 2.25 mm. 



Type. — 9 ; Southern slope of Irazii near Cartago, Costa Rica, 

 December 15, 1909, (sweeping over mud), [Tj'pe Xo. 6137J. 



OCHTHEROIDEA 



1896. Williston, Trans. Ent. Soc. London, 1896, 401. 



A genus, structurally, not sharply defined from Athyroglossa 

 Loew. In fact it seems to be its neotropical representative, al- 

 though one of its species ranges into the nearctic zone. This 

 genus may, however, be easih' distinguished by its entirely 

 shining black species, with the fore femora spinose below and the 

 halteres white. At least these characters hold with the known 

 species. The genus is well represented in Costa Rica, that 

 region having five of the seven known species. The other two, 

 being from adjacent countries, are also included in this paper, 

 but will be more fully treated in my Revision. 



TRANS. AM. ENT. SOC, XLIV. 



