272 S. W. WILLISTON, M. D. 



rate dark brown spot. The third joint of the antennse is gently 

 concave. In front of the scutelkini tliere are six short approximated 

 black spines in a row. Macquart says : " extremite de la face noire. 

 Thorax et abdomen a poils noirs," and, of the wing nervures : " trans- 

 versales bordees de brun, ainsi que le stigmate." 



45. Voluoella nieretricias n. sp. 



'^ . — Length 10 — 12 mm. Eyes fulvous pilose. Frontal triangle .small, a little 

 protuberant, with a little black pile in the middle ; of the same color as the face. 

 Face translucent reddish yellow, projecting downwards and forwards, the under 

 margin of the cheeks concave, the facial concavity long, the tubercle large and 

 obtuse. Autennffi a little more reddish than the face, slender, the third joint 

 gently excised above and narrowed on the di.stal part; the arista with moderate 

 pilosity. Thorax deep blue with violet reflections, with erect black pile and 

 some white pubescence. Scutellum like the mesonotum. Bri-stles on the sides 

 of the mesonotum and margin of the scutellum, and a transverse row in front 

 of the scutellum. Abdomen deep blue, with violet reflections, with short, black 

 pile. Legs black. Wings grayish or brownish subhyaline; a large quadrate 

 brown spot reaching from the costa to the fourth vein and thence to the proximal 

 part of the posterior basal cross-vein ; costal, subcostal and first basal cells 

 clouded : marginal cell regular, closed. 



9 . — Front a little darker than the face, clothed with black pile ; a short, cres- 

 centic groove on each side. Abdomen nearly bare, except distally. Third an- 

 tenna] joint broader. 



Six specimens, Chapada and Rio de Janeiro. The species is allied 

 to Temnocera FrauenfekU Schiner, but will be distinguished by the 

 blue color and wing spot. 



46. Voliicella obesa Fabr. 



Thirty-eight specimens from Chapada and Rio deJaneiro. 



47. Voluoella seniiila n. sp. 



9 . — Length 1.5 — 18 mm. Closely allied to V. obesa, but differs in the deeper 

 blue color, showing only moderate green reflections on the mesonotum, and at 

 the tip of the abdomen. In the larger size ( V. obesa rarely exceeds 12 mm.) and 

 in the wings being deep brown at the base. The wings are more infuscated in 

 front, the quadrate spot from the stigma to the cross-vein is larger, as is also the 

 spot at the tip of the marginal cell. In the structure of the antennse, wings and 

 face they scarcely differ. 



Two specimens, Piedra. 



48. Volticella inaoula Wied. 



Four specimens from Chapada I identify as this. There is a dif- 

 ference in the amount of red color on the thorax and abdomen, and 

 in the depth of violet reflections. The arista is long and finely 

 plumose, there is no emargiuation on the upper part of the third an- 



