The remarkable insect which is the type of our genus, has 

 been ascertained by the late Dr. Arnold to be one of those 

 destined to destroy the Blattse ; whether by depositing its eggs 

 in their larva or ova, is I believe not known. 



As the species vary in the structure of the trophi, and in 

 the nervures of the wings, they have been thus divided by 

 Latreille. 



I. Antennae with the 3rd joint much longer than 



the 2nd. Upper wings with distinct discoidal 



cells. 



* Mandibles unidentate(orbidentate). Labial palpi 



with the penultimate joint much dilated, &c. 



1. E. appendigaster Linn., Reauni. torn. 6. pi. 31. f. 13. — 



Rcemer, L S5. f. 7. — Kirby Sf Spence, tab. 4. f. 2. — 

 Don. 10. 329.— laevigata Lat. 

 Entirely black. 



This was the only species known to Linnaeus. I think the 

 E. Icevigata of Latreille is the same ; and that the E. appen- 

 digaster of this author is distinct, for Linnaeus describes his 

 insect as entirely black. 



This species is said to inhabit America, Jamaica, the Cape 

 of Good Hope, the Isle of France, New Holland, Spain, and 

 England, where it may have been introduced with the Cock- 

 roaches. 



** Mandibles tridentate. Labial palpi with the 

 penultimate joint not much dilated, &c. 



2. E. flavicornis Nobis — appendigaster Lat.y Oliv., Panz. 62. 



12. var. — Jur. pi. 7. Gen. 1. 

 Black. Antennae, tarsi, and 4 anterior tibiae rufous. In 

 Panzer's figure the body and all the legs are rufous also. 



Inhabits the South of France, Spain and Italy. I am not 

 aware that it has been discovered in Britain. 



II. Antennae with the 3rd joint not much longer 

 than the 2nd. Upper wings with no discoidal 

 cells. 



3. E. fulvipes Curtis Brit. Ent. pi. 257. 



Mr. Dale first discovered this new insect a few miles from 

 Dorchester ; and the 22nd of last August I found a specimen 

 under a flag of turf in the beautiful plantations of Ramsdown 

 near Heron Court, Hants. 



4. E. minuta Fab., Oliv., Coq. pi. 4./ 9. 

 Smaller than the last, and entirely black. 



Mr. Dale has taken this insect upon Parley Heath, Dorset, 

 where Blatta lapponica abounds ; and having found them at 

 the same time (3rd September) and on the same spot, he con- 

 jectures that this little Evania is the parasite of that Blatta. 



I am indebted to Mr. R. Chambers, F.L.S. for specimens 

 of the pretty plant represented. Campanula hederacea (Ivy- 

 leaved Bell-flower). 



