298 Mr. F. Smith on 



Head : the clypeus and sides of the face as high as the 

 sinus of the eyes with a dense silvery pubescence, the 

 cheeks thinly covered with the same. The mesothorax 

 closely punctured; the metathorax obliquely truncate, 

 smooth, and finely punctured above, but transversely and 

 coarsely striate at the sides and behind, the sides have 

 also some silvery pubescence ; a deep longitudinal channel 

 runs from the base to the margin of the truncation, in 

 which is a longitudinal carina ; down the truncation runs 

 another deep channel; the wings hyaline and iridescent, 

 the nervures black. Abdomen: the margins of the three 

 basal segments much depi-essed ; the abdomen has a fine 

 hoary pubescent pile, only observable in certain lights. 



Hab. — Mexico. 



In the British Museum. 



Genus Pisonitus, Shuck, 

 (See Plate VI. fig. 7, for wing of Pisonitus rugosus) . 



1. Pisonitus rufipes, Shuck. Trans. Ent. Soc. ii. 



79. ?. 

 Hah. — Tasmania. 

 In the British Museum. 



2. Pisonitus argentatus, Shuck, Trans. Ent. Soc, ii. 



79. ?. 

 Hah. — Mauritius. 

 In the British Museum. 



3. Pisonitus rugos^is, Smith, Cat. Hym. Ins. pt. iv. 



p. 313. ?. 

 Hab. — India. 

 In the British Museum. 



4. Pisonitus ruficornis, Smith, Cat. Hym. Ins, pt, iv. 



p. 315. $. 

 Hab. — Australia (Maclntyre River) . 

 In the British Museum. 



Genus Paeapison, n. g. 

 (See PI. VI. fig. 6. for wing of Parapison rufipes) , 



Head as wide as the thorax, occasionally wider; eyes 

 large, reniform, ocelli in an equilateral triangle on the 



