HEMIPTEKA— HETEROPTEEA— LYG.EID.E. 375 



In our own country the numbers are largely in excess of this, tifty-one 

 species being recognized, showing this family to have been one of the more 

 important among Tertiary Heteroptera. The disposition of these in their 

 respective subfamilies has been effected only by their evident affinities in 

 general structure with existing members of these subfixmilies, not by a 

 demonstration of those definite characters (mostly relating to the position 

 of the stigmata) upon which these subfamilies were founded, as that would 

 be impossible. The result shows no small resemblance to the character- 

 istics of the European Tertiary fauna, the prevailing t}'pe being the Myo- 

 dochina and the next the Lygseina, but beyond this the resemblance fails 

 to extend greatly, the prevailing family having nearly 73 per cent of the 

 whole, while in Europe they claiui scarcely more than 50 per cent; and 

 again the Lygpe.ina have less than 16 per cent of the whole, while in Europe 

 they have about 35 per cent; further, none of the other subfamilies which 

 appear in Europe are found at all in America, our other groups being Geo- 

 corina, Oxycarenina, and Pyrrhocorina, which find no place in Europe. 

 But perhaps the most remarkable result of the investigation of the Ameri- 

 can forms is tlie large number of new generic types found to be necessary 

 in the Myodochina, where, out of the twenty-one genera only four (with 

 but five species together) are regarded as identical with existing types. 

 In the Old World a single species found at Oeningen has been considered 

 the type of an extinct genus, Cephalocoris, not found with us ; but undoubt- 

 edly, to judge from the illustrations and descriptions, a more searching 

 examination would bring out a different condition of things. Besides tliis, 

 Heer has established a magazine genus, Lygjieites, for all the members of 

 the family for which he could find no place ; it evidently comprises very 

 diverse forms. 



Subfamily LYG^^INA Stal. 



This group of Lyg;Bid;ie holds the second rank among the fossils both 

 in Europe and America, but its relative and absolute importance is greater 

 in the Old World than in the New. In Europe a considerable number of 

 species, ten or eleven, are referred to Lygseus, not including those which 

 plainly do not belong here, but it is probable tliat onl}- one of the species 

 of Heer's magazine genus Lygseites belongs here, most of the others being 

 more probably Myodochina; to this we may perhaps add his extinct genus 

 Cephalocoris. All of these seem to belong to the division of Lygajaria. 



