272 l->* 



examining these this Meek I found one larva dead and mouldy ; the 

 other had become an imago, but had died before getting rid of the 

 pupal skin. It is a $ . 



Two JEJriocampa ovata laid between them about fifty eggs, but most 

 of the larvae died young. Five, however, spun up, and one $ has just 

 emerged in the perfect state. Unfortunately I can get no alder leaves 

 at present to continue the experiment with this female. 



G-lasgow: 7 'th April, 1881. 



DESCRIPTION of a NEW GENUS and TWO SPECIES OF SEMIPTERA- 

 EETEROPTERA FKOM SOUTH AMEEICA. 



BY JOHN SCOTT. 



The insects which I am about to describe are extremely interest- 

 ing, on account of their furnishing, so far as I am aware, an additional 

 link to the chain of the various ways by which the members of this 

 group obtain an existence. They w r ere forwarded to me some con- 

 siderable time ago by my friend the Eev. O. Pickard Cambridge, who 

 in his letter accompanying them, says : " they were found living en 

 famille with colonies of spiders." 



Family NABLIL^, Fieb. 

 Genus ARACHNOCORIS. 



Head, viewed from above, short, five-sided. Antennae : 1st joint shortest, a little 

 more than half the length of the 2nd ; 2nd, 3rd and 4th sub-equal, the battel 

 somewhat fusiform. Eyes, viewed from above, almost semi-globose. Oeelh 

 small, inserted near the base of the head. Rostrum reaching to the end of the 

 metasternum ; 1st joint short, stout, a little more than twice as long as broad 

 2nd about one-third longer than the 1st; 3rd longest; 4th about equal tc 

 the 1st. 



Thorax — pronotum very much deflected towards the head, with a narrow collar ii 

 front ; anterior margin about three times narrower than the posterior measurec 

 across the posterior angles ; disc convex ; posterior margin concave acros 

 the scutellum. Scutelhim triangular, longer than the width across the base 

 apex acute. Elytra very much constricted from before to beyond the middle 

 membrane rounded at the apex, with about seven straight nerves, the fourtl 

 from the exterior margin furcate from the middle. Legs — thighs : 2nd pai 

 incrassated with two rows of short teeth on the under-side, 3rd with a lonj 

 stout tooth on the lower side of the base of the fulcrum : tibia : 2nd pai 

 curved, stouter at the base than at the apex: tarsi: 1st joint shortest, 2ni 

 about one-half longer than the 3rd. 



Abdomen narrowed at the base. 



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