HE.Mli'TEiLY ilKTEUUi'TKKA. 



The principal change, which may be noted here is the almost total 

 extinction of the Capsiihr in the European representation which shows hut 

 a single species; the >Saldid;e and Hydrobatidae Jo ii')t appear and tlie 

 Araditla- are notably reduced. The greatest contra.-ts between tin- Euro- 

 pean and American rucks, with an almost equal total number of species, 1 is 

 seen iu the (lapsida.-, which have 8 per cent of the total fauna in America, 

 OU per cent in Europe, and the Coreidai with 22 per cent in America and 

 I 1 per rent in Europe ; these are the only cases of striking contrast in 

 which the American fauna is the richer; the others are the Reduviidse, 1.3 

 per cent for America, 7.4 per cent for Europe; the Nabidte, none for America, 

 .; per cent for Europe ; and the Physapodes 2 per cent for America, 11 per 

 cent for Europe. The contrasted balance of the Lygseidse and Pentatom 

 i.s well seen, America having 33 per cent of Lygajidjc and 24 per cent of 

 iVntatomida-, Europe 23 per cent of the former and 31 per cent of the latter. 



Very little change appears in the smaller families (a relatively small 

 number of which occur in amber) except in the entire absence of any repre- 

 sentatives of Hydrobatidse and Saldidse, the former occurring in America. 

 It is also surprising to see how little the larger families (with a single excep- 

 tion) are affected by the new table, amber having but the meagerest po--i- 

 ble contribution to offer to the Pentatomidse, Coreidre, Lyga-ida , and 

 1'hvsapodes, while the single exception noted above of the Capsid-e is a 

 startling one, amber furnishing nineteen of the twenty European Tertiary 

 species. 



It may be worth while to extend some of these comparisons in a differ- 

 ent direction, that of existing American faunas. Tin-re are, 1 believe, but 

 three opportunities for such comparison. Fir.-t, Mr. I'hlerV ( 'h.-ck-li.M of the 

 North American Ileteroptera (ISsil), which embraces all species known at 

 the time, including the Mexican and West Indian ; second, the same wri: 

 valuable List of the llemiptera of the region west of the Mississippi (1. V 7>' . 

 which represents particularly the geographical region of our Tertiary fossil 

 I leteruptera ; and, third, Mr I >istant's cont ribution to the Iliologia < V|itrali 

 Americana < L880 -'89), which has a decidedly more southern aspect than 

 Uhler's general list. Itistant's work has progressed only through the larger 

 families (in iv\ erse order to thai t', >1 lowed here i and indeed at this writing the 

 supplement to the tir-t \-olume is not complete, and accordinirly in what 



I i i'- i'iiilMiiT:ll.i>i> nl I In- Kil 



111. -I .1 V, ]|.. . ,.| 



