LACE-BUG GENERA — DRAKE AND RUHOFF 21 



has become a permanent resident and is now found in several New- 

 England States and eastern Canada. 



Corythucha morrilli Osborn and Drake, new immigrant in Hawaii, 

 is a native of the southwestern United States, Mexico, and the West 

 Indies. 



Through international commerce (dormant nursery plants), three 

 Palearctic species of the genus Stephanitis accidentally have been 

 shipped into and became established in eastern United States: *S. 

 globulifcra (Matsumura) and S. pyrioides (Scott) from Japan, and 

 S. rhododendri Horv&th from Europe. Stephanitis rhododendri was 

 originally described by Horvdth (1905, p. 567) from Holland. Distant 

 (1910c, p. 396) theorized that the species had been introduced into 

 Europe from India, "the headquarters of the genus Rhododendron in 

 the Himalayan region." Johnson (1936, pp. 345-346) presents a 

 different hypothesis relative to the dissemination of the rhododendron 

 lace-bug. Contrary to other authors, he believes that S. rhododendri 

 is indigenous to America (eastern United States) and that its occur- 

 rence in Europe originated from the shipments of dormant nursery 

 plants of Rhododendron and Azalea from eastern United States. 



Lounsbury (1923, p. 548) states that S. rhododendri gained entrance 

 into South Africa through large shipments of rhododendron plants. 

 In this connection, it is interesting to record that we have received 

 several specimens of S. pyrioides from Australia (Lone Cove, New 

 South Wales), taken there on azalea. 



In the subfamily Agrammatinae (olim Serenthiinac) there are 56 

 species distributed among five genera. Fossil forms are unknown. 

 The subfamily is represented in six of the faunal subregions of the 

 world (table 2). It is not known to inhabit the Nearctic, Papuan, 

 New Zealandian, and Oceanic subregions. An indigenous genus, 

 Coleopterodes, with two species, is the only genus found in the Neo- 

 tropical subregion, and the only one inhabiting the New World. 



Agramma is by far the largest and most widely distributed genus. 

 It comprises 17 species in the Palearctic subregion, 22 in the Ethi- 

 opian, 10 in the Oriental, 1 in the Malagasy, and 1 in the Australian. 

 Of the 49 described species, two occupy two subregions. 



The subfamily Cantacaderinae, apparently the most primitive of 

 the Tingidae, comprises an aggregate of 86 species separated among 

 21 genera. Unlike the other subfamilies, there are no discordant 

 genera in the cantacadcrines. In fact, considering all genera and 

 their components together, the entire subfamily forms a readily 

 recognizable, homogeneous unit with combinations of characters that 

 distinctly set them apart from both Tinginae and Agrammatinae. 



Cantacadcrines are represented in the Neotropical, Oriental, Mala- 

 gasy, Oceanic, Papuan, Ethiopian, New Zealandian, and Australian 



