288 S. W. AVILLISTON, M. D. 



part of second, and the third, deep red ; second joint very distinctly longer (about 

 a fifth) than the first, third joint not half the length of the second ; arista 

 slender, silvery white. Mesonotum brownish black, in the middle with a broad 

 yellowish dusted stripe ; the humeri, a spot at outer end of suture, continued as 

 a narrow, interrupted, sutural, golden poUinose cross-band ; a supra-alar vittulai 

 and the scutellum, except a large transverse spot, all yellow. Pleurae black, 

 grayish poUinose; a vertical stripe on the mesopleurse, nearly confluent with a 

 sterno-pleural spot, yellow. Abdomen black, the sides and venter of the cylin- 

 drical portion of the second segment, its posterior margin and the posterior 

 margin of the two following segments, yellow ; fourth segment with a biarcuate 

 yellowish poUinose cross-band ; the second segment is nearly as long as the two 

 following together, slender and cylindrical on the anterior two thirds or more; 

 the following segments form a broadly ovate mass. Legs yellow; the middle 

 femora with a spot below, the hind femora with a broad ring, sometimes incom- 

 plete above, black; front and hind tarsi more reddish or brownish ; hind tibise 

 with an incomplete brown ring opposite the femoral ring. Wings hyaline, with 

 an equal brown margin in front. 



Four specimens, Chapada, November. With these males there 

 are five female specimens that seem to be of the same species, though 

 differing somewhat in coloration. The yellow of the face is less in 

 extent, the spots smaller ; the antenna? are darker colored ; the ocelli 

 are situated on a more or less extended blackish spot ; the mesonotum 

 is black, wholly without the yellowish dusted stripe, the spots are 

 smaller, the supra-alar vittula, when present, very slender ; the legs 

 have more black, etc. 



Dedicated to Baron C. R. von Osten Sacken, of Heidelberg, the 

 able dipterologist. 



89. Ceria IVIikii n. sp. 



'^ 9 • — Length 10—12 mm. Allied to SacTcenii. The frontal process is shorter, 

 the first antennal joint longer, distinctly longer than the second, the third is a 

 half or more of the length of the third. The yellow markings of the face con- 

 sist of a slender, arcuate stripe on each side, not reaching the frontal process, 

 and two small orbital spots, the upper one opposite the base of the frontal pro- 

 cess, confluent, in the male, with a narrow frontal orbital margin. In the female 

 the front is black, with distinct rugosities on each side. A yellow spot on each 

 side of the ocelli on the occipital margin. Mesonotum deep black, with a small 

 yellow humeral spot, and another at outer end of suture ; no vestige of a yellow 

 poUinose sutural band. Scutellum narrowly yellow at base and margin. Pleurae 

 with a slender stripe, and a very small spot below, yellow. The abdomen is, in 

 structure and markings, similar to that of Sncketiii; the dilated portion rather 

 shorter and broader. The legs are blackish brown, with the narrow base of 

 femora, the knees and middle tarsi yellow. Wings as in C. Sackenii. 



Two specimens, Chapada, April, November. 



Dedicated to the well-known dipterologist, Prof. Josef Mik, of 

 Vienna. 



