55 



4- Aphclopus microleucns sp. nov. 



Male, black, the clypeus and mandibles (except the red teeth) 

 white, the two basal joints of the antennae dark brown or pitchy, 

 all the coxae and trochanters pale yellowish-white or white, the 

 front legs testaceous, but the femiora are somewhat sordid and 

 the tarsi except the basal joint infuscate ; middle legs (except as 

 above noted) still more darkly sordid and the hind legs almost 

 black ; stigma blackish fuscous. 



Sculpture of head and mesonotum as in all the preceding, but 

 the parapsidal furrows are effaced ; propodeum reticulately ru- 

 gose, this sculpture extending on to its posterior face also, where, 

 however, there is a small smoother area. Antennae simple, fili- 

 form, first three joints subequal. shortish, not much longer than 

 wide, the third on its wide face subtriangular, fourth and follow- 

 ing nearly parallel-sided, the fifth, sixth, seventh subequal and 

 longer and more slender than the fourth ; seventh and eighth twice 

 as long as wide, or more. Abdomen smooth and shining. Length 

 under 2 mm. 



HAB. Nogales. Arizona ; bred from a species of Typhlocyba 

 {Zygina) no. 2456. 



ENCYRTIDAE. 



A remarkable Encyrtid was bred from larvae feeding inter- 

 nallv in the body of a Jassid {Oncometopia latei-alis) several 

 parasites emerging from the host, which after their emergence 

 lived for a week. 



Following Ashmead's classification this species belongs to the 

 tribe Encyrtini and I have felt some doubts whether it might not 

 be referred to Mavr's genus Prionomastix, but the frons is so 

 very wide that I have been obliged to consider it as a new one, 

 and it is quite possible that in reality it is not at all allied to the 

 other, which is unknown to me. 



Thysanomastiiv gen. nov. 



Head stronglv concave behind, the ocelli in a triangle with 

 verv wide base", but though so widely separated, the posterior ones 

 areas far removed from the eye-margins as from one another, the 

 frons being verv broad. Head in front view widely subtriangular, 

 strongly convex, the antennae inserted high up near the middle, 

 the space between the eye and base of mandible about as long as 



