434 Professor Williston on the 



BORBORUS. 



Meigen, Illiger's Mag., ii., 276, 1803. 



1. Borhorus venah'cus. (PL XIV., fig, 163, wing.) 



Borhorus venalicus, Osten Sack en, Catalogue of 

 Diptera, 2nd ed., 263. — Africa, Cuba, Brazil 

 (Col. Williston). 



$, $. Front deep red, blackish above; opaque, with about 

 ten small silvery spots. Antennae brownish-red ; arista bare. 

 Cheeks and face yellow, the latter shining. Thorax black or 

 nearly black, moderately shining, the dorsum with two pollinose 

 stripes and about twenty small, white-pollinose partially confluent 

 spots. Scutellum large, subtriangular, opaque-black, the base and 

 small spots at the tip white. Abdomen black, the narrow hind- 

 margin of the segments whitish. Femora black or deep brown, 

 with the tip yellowish ; tibiae brown, the front pair with one, 

 the middle and hind pairs with two dark-brown rings. Tarsi 

 yellow, with the two distal joints black and the moderately 

 thickened hind metatarsi partly brown. Wings nearly hyaline, 

 with a small brown cloud at the angulated tip of the second vein 

 and at the origin of the third. Third vein gently curved ; front 

 border of the wings without spinous bristles. Length 2-3 mm. 



Tvrelve specimens. " Dr. Loew [in Utt.) informs me 

 that this is an African species; and as 1 have found it 

 abundantly in Cuba, it seems probable it was brought 

 over in slave-ships.'^ Sacken, /. c. I have the species 

 from Brazil. 



2. Borhorus illotus, n. sp. (PI. XIV., fig. 164, wing.) 



$ . Front opaque-black, on the lower part red. Antennte red, 

 the third joint rounded ; arista finely pubescent. Face reddish- 

 brown. Thorax dark yellowish-red, opaque ; mesonotum with 

 abundant and rather long black hair ; pleurae black near the root 

 of the wing. Abdomen opaque-black. Legs brown or brownish- 

 yellow, the femora for the most part blackish ; middle and hind 

 tibite with stout bristles on the outer side ; hind metatarsi moder- 

 ately dilated, but little more than half the length of the slender 

 second joint. Wings yellowish-hyaline ; third section of the costal 

 vein not more than two- thirds the length of the second section ; 



