452 ^Ir. T. D. A. Cockcrcll on CocclJa?. 



derived by the degeneration of tlie legs and antenna\ 'J'he 

 skin shows many large circular or oval pits, a condition 

 intermediate between that of Cahjmvatus and Saisseti'a. 

 The legs and antennse are well developed. It is a matter of 

 opinion whether this group sliould be regarded as a genus or 

 as a subgenus of Calijmnatus. My principal reason for 

 treating it as a genus is that I think it lias been indejicndcntly 

 evolved in the neotropical region, the true CaJymnatus being 

 derived from the Old A\ orld, though some of the species are 

 now cosmopolitan through introduction by human moans. 

 Colymnatiis schini (from i\rexieo), C.ruheJhts (from Jamaica), 

 and C. tw7ius (from 'J'rinidad) are as yet known only from 

 the neotropical region ; but the first may possibly prove not 

 to be a genuine Cohjmnatus, while the other two have very 

 possibly been introduced from the Old World tropics *. 



The following, described under Lecanium, are now trans- 

 ferred to Mesolecauiinn : — J/, nocturnum (C. & P.), ^1/. May- 

 teni (Hemp.), M. j'horadendri (Ckll.), M. hatake (Ckll.), 

 iV. ohscitrum (Hemj).), M. haccharidis (Ckll.), M. pseudo- 

 semen (Ckll.). The following are referred here provisionally : — 

 M.jahoticabce (Hemp.), 31. camponiauesice (Hemp.). 



Stictolecanium, gen. nov. (Lecannnce). 



Type, Stictohcanium ornatum {Lecanium ornatum, Hem[)el, 

 liev. JMus. Paulista, iv. p. 421). 



Allied to Mesolecanium, with well-developed antennae and 

 legs, but distinguished by the arrangement of the glands, as 

 described by Hempel. It perhaps represents a transition 

 towards Eucalymnatas. I have specimens from Mr. Hempel. 



Other American species hitherto placed in Lecanium are to 

 be referred as follows : — 



TouMETELLA ihiralilis (Ckll,), Hubbard, T. quadrifaacia'a 

 (Ckll.), T. turfjida (Ckll.), T. parvicornis "(Ckll.). 

 Doubtfully referred here are 7'. sonorensis (C. & P.) 

 and T.pini (King). All these are North American. 



Mallococcvs hiniqerus (Hempel). This reference may be 

 doubtful, but I cannot see what else to do with Leca- 

 jiiuni lanigerum y Hemjicl. 



* Aspidiotus sacchari nnd Psendocovcm sacchari (Dactylopiun sacchnri 

 Ckll.), Avhich I described from the West Indies, have now been traced to 

 the Old World tropics. Kumeioiis other specie.-; are known to have been 

 brotigrht to America from the Old World. 



