418 

 Genus Piiaciocephalus Kirk. 



Until the types of PJiariorephaJus Kirk, and Cenchrea 

 Westw. are compared there nuist he some donht as to the dis- 

 tinction of these two genera. C. dorsalis Westw. is described 

 and tigured as having the snl)Costal cell short whereas in Plicu- 

 cioc('i)li(ihts it is hmg. I shall retain for the present the name 

 PliacioccphdJus Kirk, for those forms having the subcostal cell 

 long. 



P. uMeri (Ball). 



Cenchrea uhlerl Ball, 1902, Can. Entom., XXXIV, p. 261. 



P. sp.? 



Two female specimens from Chd)a which do not agree with 

 any description, but I refrain from naming theui without 

 having males. 



P. i)a)'is]ti sp. nov. 



$ First claval vein joining suture l^efore it joins second claval, clavus 

 closed. 



jMikado-orange ; tegmina hyaline, opaque with waxy secretion, light 

 fuscous yellow over costal and apical portion of subcostal cells, veinsi 

 yellowish ; wings hyaline, opaquely white with waxy secretion, veins con- 

 colorous with membrane. 



Rledio-ventral edge of pygophor produced into a quadrate plate, 

 slightly longer than wide, apex slightly narrower than base, turned 

 slightly dorsad ; anal segment very long and narrow, anus at apex, apex 

 turned slightly ventrad and produced into two angular points ; genital* 

 styles large, gradually widening to truncate apex, ventro apical corner 

 produced into a long, thin spine turned inward, ventral edge slightly 

 convex with a small quadrate process near base, dorsal edge concave 

 with a small rounded process about middle. 



liab. Bartica, British Guiana, March, 1901 (ColJ. TI, S. 

 ParlsJi). Described from one male. Type in coll. of Prof. 

 H. Osboni. 



P. { hipiiuciaiii s]). nov. (tig. 1). 



This differs from the generic type in having a shorter sub- 

 costal cell, but uot very short, the media has three sectors, the 

 first two arisiuii' verv near together, the ntedia beinii" l)ent at 



