E. T. CRESSON, JR. 51 



rather faint bluish tinge; knees, tibiae, and tarsi, except apices, pale. Length. — 

 2 to 2.3 mm. 



Tijye. — cf ; Cartago, Costa Rica, jNIay 25, 1909, (along ditch), 

 [Type No. 6175]. Paratypes. — 1 cT', 2 9, topotypical. 



Also represented by seven specimens collected Maj^ 17, over 

 ditches in Cartago and June 15, over mud on the southern slope 

 of Irazu near the road to the crater. 

 Ilythea calrerti new species 



A species distinguished by the short second vein and the large 

 roundish hyaline spots in the wing. 



Black; antennae except bases and apices, mouth parts, legs including coxae, 

 and halteres, yellowish. Shining, more or less metallic tinged, especially the 

 mesonotum and frons. Wings infuscated with large, round, white or hyaline 

 spots between the veins. Face sparingly yellowish, sericeous; polished above 

 the hump. Thorax and abdomen sparingly golden. Second and third costal 

 sections subequal. Marginal cell with two, submarginal with one, and first 

 posterior cell with four, isolated brown spots. Length. — 1..5 mm. 



Type. — ^9 ; Filadelfia, Costa Rica, January 18, 1910, (muddy 

 beach of Rio Tempisque), [Type No. 6123]. 



Another female from Juan Vinas, April 28, collected at a brook 

 near woods. 



Ilythea fenestralis new species PI. Ill, fig. 21. 



Similar to calverti, but the hyaline areas are much l^roader and more quad- 

 rate than the infuscated interspaces, and arranged more or less to form fasciae 

 across the wings. 



Black; antennae, mouth parts, halteres, legs, and sometimes face below, tawnj\ 

 Shining above, sparingly brown pruinose below. Frons and mesonotum, and 

 scutellum strongly tinged with metallic blue and purple. Face white and 

 brown, sericeous. Cheeks as broad as antennae. Wings with venation and 

 maculation as figured. Length. — -Lo to 2 mm. 



Type. — 6^; Cartago, Costa Rica, ^Nlay 25, 1909, (along ditch), 

 [Type No. 6124]. 



Also represented l^y three specimens: Guacimo, June 6, and 

 over mud at Turrucares, December 22. 

 Ilythea flavipes Williston PI. Ill, figs. 19, 20. 

 iSUti. Ih/thca Jlavipv.'i ^\■illiston, Trans. Ent. Sec. London, 1S9G, 403. 



Although 1 am not al)solutely certain that the series before me 

 lielongs to this species, there is very good reason to think it will 

 prove to be such. The species, as we understand it, may be 

 readily distinguished bj' the characters given in the table of 

 species. 



TR.\NS. AM. ENT. SOC, XLIV. 



