240 Mr. J. O. Westwood 07i Evania and 



remainder of the abdomen. The ovipositor is not exserted. The 

 antennae are thirteen-jointed in each sex, the basal joint in the 

 females being more elongated, so as to form, with the remainder, 

 a considerable elbow. J urine describes the antennae as being 

 thirteen or fourteen-jointed according to sex, but incorrectly. 



The species of this genus were discovered (as we learn from 

 Kirby and Spence*) to be parasitic upon the species o( Blattidce. 

 The correctness of this statement has been confirmed to me by 

 Mr. R. E. Lewis, who has found them on board the ship in which 

 he sailed to Van Diemen's Land, and which was much infested 

 with Blatta orientalls ; and hence the Evanice m'nuita and fulvipes, 

 having been found in situations where the indigenous Blatta 

 Lappon'ica abounds, are alone regarded by Mr. Stephens as strictly 

 entitled to be considered indigenous ; the typical species Evania 

 appendigaster, which is attached to the Blatta orientalis, being 

 considered an imported insect. — (Ulustr. of Brit. Entomology, 

 Mand. vol. vii. p. 118.) 



Latreille introduced two primary divisions into this genus, 

 founded upon the distinctness or obliteration of the apical nerves 

 of the wings and the length of the second and third joints of the 

 antennas. These divisions Dr. Leach regarded as generic, and 

 accordingly, in the Edinburgh Encyclopaedia, gave the name of 

 Brachygaster to the second section, having the Evania m'muta as 

 its type, (In the British Museum Cabinet the genus however 

 stands under the name of Coranila of Leach's Manuscripts.) 

 This genus Brachygaster has been retained by Mr. Stephens. 

 Illiger, however, in his edition of Rossi, had previously named it 



terminating at the place of insertion of the abdomen) by an impression ; the meta- 

 postscutellum being exceedingly developed. (Mod. Class, of Insects, vol. ii. 

 p. 134, fig 74, 4 and 5.) The metasternum is also very remarkable, terminating 

 in a strong furcate process, of which the points are recurved and fitting into the 

 posterior coxae. 



• In the third volume of the Introduction to Entomology (p. 580) it is stated, 

 that " the history of Evania, the parasite of the Blatta:, had been traced by Dr. 

 Reid, who did not however live to give his discoveries to the woild ; it was how- 

 ever hoped that they would not be lost, being in most able hands." In the fourth 

 volume of the same work (p. 216) it is however stated, that " the late Dr. Arnold, 

 whose tact for observation with regard to the manners and economy of insects has 

 rendered his loss irreparable, discovered that the remarkable parasitic genus 

 Evania F. was appropriated to the all-devouring Blattce : whether it attacked it in 

 its egg or larva state the author had not been informed. This little benefactor is 

 here extremely rate, at least in the country ; perhaps in towns where the cock-roach 

 abounds it may be more common." I am however indebted to Mr. W. S. Mac Leay 

 for the information that it is within the egg-pouch of the Btattoc that the Evaiiia is 

 parasitic. 



