TERRESTRIAL FAMILIES OF HEMIPTERA-IIETEROPTERA 127 



extending back throughout the central region of the vertex. Antennae entirely black. Elytra 

 just surpassing the apex of the abdomen. Otherwise as male in non-sexual characters. 



Length $, 3.20 mm. (holotype) ; 2, 3.38 mm. (allotype), 3.65 mm. (paratype). 



Indian Tibet. S (holotype), 2 5 9 (allotype and paratype) L 32, Ororntse Tso, 

 altitude 5297 m. (17,381 ft.), near margin of lake, among short sparse grass in company 

 with Chlaiuydatus pachycerus Kiritsh. 11 July, 1932; 2 & S L48, Kyang-La, altitude 

 5100-5200 m. (16,700-17,100 ft.), among short sparse grass with Pcgaeophyton prob. 

 scapifolhim Marq. and Skan., in company with C. pachycerus, 9 July, 1932. 



In form this subspecies in its most extreme facies differs very widely from A^. e. ericae, 

 departing as much from the latter in its proportions as does A'', tliymi (cf. Table I). Were 

 it not for the existence of intermediate specimens and the identity of the genitalia throughout 

 the entire series it would have been regarded as a very distinct species. Though the feeble 

 development of the posterior pronotal angles suggests brachyptery, the wings appear to be 

 as well developed as in the North Haven specimens of the typical subspecies. 



Key to the Subspecies of Nysius ericae (ScJiill.), applicable primarily to Male Specimens 



1. About three times ( S 2.92-3.12) as long as wide, lateral margins of the pro- 

 notum sinuate, posterior angles subprominent 2 



Less than two and three-quarters ( S 2.58-2.74) times as long as wide, lateral margins 



of pronotum straight, posterior angles reduced N. e. alticola subsp. n. 



Koh massif, Chang Chenmo Range, from over 5100 m. 



2. Posterior part of promitum, femora and intcrvenal spaces of corium widely suffused 

 with l)lackish-l)rown 3 



Posterior part of pronotum and intervenal spaces of corium testaceous, femora 

 testaceous with black spots A', e. ericae (Schill.) 



Palaearctic from France to Sil^eria but absent in Britain, 

 Scandinavia, Northern Germany and Northern Russia ; Nearc- 

 tic throughout U. S. A. and Southern Canada ; locally wholly 

 or in part replaced by other subspecies. 



3. Corium evenly rounded to its ma.ximum width, pale parts of elytra opaque 



A'', e. obsciiratus Horv. 



Central Asia from the Caspian to China, in part replacing 

 A'^. e. ericae. 



Corium suddenly expanded to its maximum width, pale parts of elytra hyaline 



A'', e. groenlandicus (Zett.) 



Lapland, Greenland, Iceland and Arctic and Sub-arctic 

 America. 



