some allied Genera of Hymenopterous Insects. 239 



the " Horae Entomologicae " relative to such groups, I do not here 

 propose to detail any character for the family, and shall therefore 

 only observe, that generally the antennae are composed of only 

 thirteen or fourteen joints, the abdominal peduncle is inserted at a 

 considerable elevation upon the posterior part of the thorax, and 

 the mandibles are toothed internally.* 



From the various families of which the section Pup'wora of 

 Latreille is composed, with the exception of the Iclineumones 

 adsciti, the Evaniidce are easily distinguished. Thus the neuration 

 of the wings will distinguish them from the Chalcididce ; the same 

 character and the paucity of joints in the antennae will separate 

 them from the Iclineumones genuini, and the structure of the 

 ovipositor from the Cynipidae, Proctotru]ndce,'\ and ChryskUdce. 

 From the Iclineumones adsciti however, at least from the most 

 aberrant species of that group, the line of demarcation is less 

 evident, since we find some of the Aphidii in that family possessing 

 antennae with not more than fourteen joints, and the genus Paxyl- 

 loma, under its various names of Plancus and Hyhrizon, has been 

 placed both amongst the Evaniidce and the Iclineumones adsciti. 



With these preliminary observations I proceed to a review of 

 the genera Evania and its allies, proposing to insert, under each, 

 descriptions of such new species as have occurred to me, com- 

 mencing with those genera which have the abdomen destitute of 

 an exserted ovipositor. 



Evania, Fabr. 



The chief character of this genus consists in the very small 

 size of the abdomen, which is greatly compressed, of a triangular 

 form, and attached to the thorax, rather above the centre of the 

 metathoracic scutellum (and not at its posterior extremity as in 

 raost oihex HymenopteraX), by a peduncle about as long as the 



* I have not made use of the number of joints in the palpi as a character of 

 the family, since it is evident, from analogy with the aberrant Jchneumonida:, that 

 variation in their number is a necessary consequence of such aberration ; a remaik- 

 able proof of this occurs in Evania, some species of which, even in its restricted 

 state, possess apparently only five joints to the maxillary palpi and others six. 

 FiJe Lat. Gen. 3.251. 2. 



t The relationship of Pelecinus to Proctotrupes will be considered in the ob- 

 servations on the former genus. 



i This peculiarity, although it appears at first sight anomalous, is dependent 

 upon the excessive development and thickness of the metathorax, of which the 

 praescutum is reduced to a very slender dorsal piece, having the posterior wings 

 attached at its sides ; the metascutellum and postsculellum being confluent, although 

 the limits of the metascutellum are indicated (of a triangular form and small size, 



s 2 



