NEW GENERA AND SPECIES OF APHELTNIN.E. 71 



ticularly of the eastern United States, has been undergoing a change. 

 Species that were abundant eight or twelve years ago have become 

 scarce, and introduced species have taken their places. It is indeed 

 difficult to decide whether any of our Aphelinina^ are natives of the 

 United States. The introduction of plants from abroad, including 

 very many dift'erent kinds of hothouse plants bearing scale insects, 

 has resulted in the introduction not only of new scale insects, but of 

 a number of species of scale-insect parasites. These parasites have 

 undoulitedly in some instances attacked native scale insects and have 

 increased in number. It seems very possible that Co€copha<j\(s leeanii 

 Fitch and AphellnKS mytilaspidis Le Baron are native species. The 

 same, too, is probably the case with EretinocevHS rorni of Haldeman. 

 but it seems j^robable that of the remaining species the great majority 

 are of foreign origin. 



In order to facilitate the recognition of genera, the descriptions of 

 the new forms contained in this paper are prefaced by a catch table 

 of genera. This table applies only to females. The males of many 

 genera are not known, and as ji rule females are reared in infinitely 

 greater abundance than males, affording a strong suspicion that alter- 

 nation of generations accompanied by parthenogenesis may hold with 

 a number of the species. "With the present paper and Avith Technical 

 Series Xo. 1, and particularly where the observer has access to von 

 Dalla Torre's catalogue, there should be no very great difficulty in 

 recognizing described species and in deciding whether species reared 

 have l)een described. 



Subfamily APHELININiE Howard. 



Table of Tribes. 



Tarsi .o-jointed" Tribe I. Apheliniiii Aslimead. 



Tarsi 4-joiuted Tri1>p II. Pteroptriciitl Ashmead. 



Tribe I. APHELININI. 



Table of Genera 

 Females. 



1. Fore winirs vrith an ohliiiuely transverse hairless line below stigma 2 



For9 \A-ings without sncli an <ibli(ine hairless line 8 



2. Antennie 4-jointed 8 



Antennte G-joiuted 4 



Antennse 7-jointed 7 



.3. S<-ape long, slender; pedicel swollen; funide joint very minute; club long 



and broad Marlnttiejla. new genus. 



4. Ovipositor exserted to from one-fifth to one-third length of abdomen 5 



Ovipositor not at all or but slightly exserted 6 



1 In the middle tarsi of Euearsia luteola and E. fjuaititttncci the 2 terminal 

 segments of the middle tarsi have coalesced, making them appear 4-jointed. 



