360 Professor Williston on the 



nearly to the base of the third joint, and nearly to the lowermost 

 one of the frontal row. Antennae blacii, reaching very nearly to 

 the vibrissjB ; third joint six or seven times as long as the second. 

 Mesonotum shining black, the sides in front pollinose. Abdomen 

 shining black ; first segment with marginal bristles ; second and 

 third segments with both marginal and discal ones, the latter with 

 two additional posterior ones on each side ; fourth segment bristly 

 on the posterior part. Legs black. Tegulte nearly white. Wings 

 hyaline ; posterior cross-vein straight, situated in the middle be- 

 tween the anterior cross-vein and the bend of the fourth vein, the 

 angle obtuse and without stump ; last section of the fourth vein 

 gently concave, terminating very near the tip of the wing. No 

 costal spine. 



Three specimens. 



Beskia. 



Brauer and Bergenstamm, Denksch. K. Acad. Wiss- 

 ensch., Ivi., 139, 1889 ; Ocypterosl'pho, Townsend, 

 J. N. York Ent. Soc, ii., 79, 1894. 



1. Beskia cornuta. (PL XL, figs. 97, head of $ ; 97a, 



wing.) 



Beskia cornuta, Brauer and Bergenstamm, Dencksch. 



K. Acad. Wissench., Ivi., 139, fig. 276. 

 Ocypterosiplio willistoni, Townsend, I. c. 

 Eah. San Domingo (Coll. Williston), Brazil (B. B.). 

 Several specimens ; agreeing well with the description. 



DEXIID^. 

 Ehynchodexia. 



Bigot, Bullet. Soc. Ent. Fr., 1885, p. xi. 



1. Rhynchodexia sororia, n. sp. (PI. XI., fig. 98, 

 head of $ .) 



^ , $ . Thorax and scutellum cinereous, with black stripes. 

 Abdomen of male red, with a black stripe ; of the female, black ; 

 palpi yellow, brown at the tip. Legs bhick. Length 'J-13 ram. 



$ . Head light opaque, golden-yellow, the cheeks more ashy ; 

 ground-colour of the lower part of the face and the cheeks yellow. 

 First two joints of the antennse, and the base of the third, red ; 

 third joint a little more than twice the length of the second ; arista 



